SSM-CURD 增删改查 -总体思路

所需如下

一 首先搭建一个dao-service-mvc的框架,一层一层搭建,在搭建dao层时,建议使用逆向工程,自动生成,比较快速和方便,之后每搭建完一层就测试一层

用逆向工程搭建dao层

https://blog.csdn.net/weixin_42333583/article/details/81748683(逆向工程)

mapper接口---->mapper映射文件---->mybatis核心配置文件----->spring_dao配置文件----->测试

实体(逆向工程自动生成的)

package it.heima.domain;

import org.springframework.format.annotation.DateTimeFormat;

import java.util.Date;

public class User {
    private Long id;

    private String userName;

    private String password;

    private String name;

    private Integer age;

    private Boolean sex;

    @DateTimeFormat(pattern = "yyy-MM-dd")
    private Date birthday;

    private Date created;

    private Date updated;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName == null ? null : userName.trim();
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password == null ? null : password.trim();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Boolean getSex() {
        return sex;
    }

    public void setSex(Boolean sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        this.created = created;
    }

    public Date getUpdated() {
        return updated;
    }

    public void setUpdated(Date updated) {
        this.updated = updated;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", password='" + password + '\'' +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", sex=" + sex +
                ", birthday=" + birthday +
                ", created=" + created +
                ", updated=" + updated +
                '}';
    }
}

userExample实体

package it.heima.domain;

import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

public class UserExample {
    protected String orderByClause;

    protected boolean distinct;

    protected List<Criteria> oredCriteria;

    
    public UserExample() {
        oredCriteria = new ArrayList<Criteria>();
    }

    public void setOrderByClause(String orderByClause) {
        this.orderByClause = orderByClause;
    }

    public String getOrderByClause() {
        return orderByClause;
    }

    public void setDistinct(boolean distinct) {
        this.distinct = distinct;
    }

    public boolean isDistinct() {
        return distinct;
    }

    public List<Criteria> getOredCriteria() {
        return oredCriteria;
    }

    public void or(Criteria criteria) {
        oredCriteria.add(criteria);
    }

    public Criteria or() {
        Criteria criteria = createCriteriaInternal();
        oredCriteria.add(criteria);
        return criteria;
    }

    public Criteria createCriteria() {
        Criteria criteria = createCriteriaInternal();
        if (oredCriteria.size() == 0) {
            oredCriteria.add(criteria);
        }
        return criteria;
    }

    protected Criteria createCriteriaInternal() {
        Criteria criteria = new Criteria();
        return criteria;
    }

    public void clear() {
        oredCriteria.clear();
        orderByClause = null;
        distinct = false;
    }

    protected abstract static class GeneratedCriteria {
        protected List<Criterion> criteria;

        protected GeneratedCriteria() {
            super();
            criteria = new ArrayList<Criterion>();
        }

        public boolean isValid() {
            return criteria.size() > 0;
        }

        public List<Criterion> getAllCriteria() {
            return criteria;
        }

        public List<Criterion> getCriteria() {
            return criteria;
        }

        protected void addCriterion(String condition) {
            if (condition == null) {
                throw new RuntimeException("Value for condition cannot be null");
            }
            criteria.add(new Criterion(condition));
        }

        protected void addCriterion(String condition, Object value, String property) {
            if (value == null) {
                throw new RuntimeException("Value for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value));
        }

        protected void addCriterion(String condition, Object value1, Object value2, String property) {
            if (value1 == null || value2 == null) {
                throw new RuntimeException("Between values for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value1, value2));
        }

        protected void addCriterionForJDBCDate(String condition, Date value, String property) {
            if (value == null) {
                throw new RuntimeException("Value for " + property + " cannot be null");
            }
            addCriterion(condition, new java.sql.Date(value.getTime()), property);
        }

        protected void addCriterionForJDBCDate(String condition, List<Date> values, String property) {
            if (values == null || values.size() == 0) {
                throw new RuntimeException("Value list for " + property + " cannot be null or empty");
            }
            List<java.sql.Date> dateList = new ArrayList<java.sql.Date>();
            Iterator<Date> iter = values.iterator();
            while (iter.hasNext()) {
                dateList.add(new java.sql.Date(iter.next().getTime()));
            }
            addCriterion(condition, dateList, property);
        }

        protected void addCriterionForJDBCDate(String condition, Date value1, Date value2, String property) {
            if (value1 == null || value2 == null) {
                throw new RuntimeException("Between values for " + property + " cannot be null");
            }
            addCriterion(condition, new java.sql.Date(value1.getTime()), new java.sql.Date(value2.getTime()), property);
        }

        public Criteria andIdIsNull() {
            addCriterion("id is null");
            return (Criteria) this;
        }

        public Criteria andIdIsNotNull() {
            addCriterion("id is not null");
            return (Criteria) this;
        }

        public Criteria andIdEqualTo(Long value) {
            addCriterion("id =", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotEqualTo(Long value) {
            addCriterion("id <>", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdGreaterThan(Long value) {
            addCriterion("id >", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdGreaterThanOrEqualTo(Long value) {
            addCriterion("id >=", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdLessThan(Long value) {
            addCriterion("id <", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdLessThanOrEqualTo(Long value) {
            addCriterion("id <=", value, "id");
            return (Criteria) this;
        }

        public Criteria andIdIn(List<Long> values) {
            addCriterion("id in", values, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotIn(List<Long> values) {
            addCriterion("id not in", values, "id");
            return (Criteria) this;
        }

        public Criteria andIdBetween(Long value1, Long value2) {
            addCriterion("id between", value1, value2, "id");
            return (Criteria) this;
        }

        public Criteria andIdNotBetween(Long value1, Long value2) {
            addCriterion("id not between", value1, value2, "id");
            return (Criteria) this;
        }

        public Criteria andUserNameIsNull() {
            addCriterion("user_name is null");
            return (Criteria) this;
        }

        public Criteria andUserNameIsNotNull() {
            addCriterion("user_name is not null");
            return (Criteria) this;
        }

        public Criteria andUserNameEqualTo(String value) {
            addCriterion("user_name =", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameNotEqualTo(String value) {
            addCriterion("user_name <>", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameGreaterThan(String value) {
            addCriterion("user_name >", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameGreaterThanOrEqualTo(String value) {
            addCriterion("user_name >=", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameLessThan(String value) {
            addCriterion("user_name <", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameLessThanOrEqualTo(String value) {
            addCriterion("user_name <=", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameLike(String value) {
            addCriterion("user_name like", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameNotLike(String value) {
            addCriterion("user_name not like", value, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameIn(List<String> values) {
            addCriterion("user_name in", values, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameNotIn(List<String> values) {
            addCriterion("user_name not in", values, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameBetween(String value1, String value2) {
            addCriterion("user_name between", value1, value2, "userName");
            return (Criteria) this;
        }

        public Criteria andUserNameNotBetween(String value1, String value2) {
            addCriterion("user_name not between", value1, value2, "userName");
            return (Criteria) this;
        }

        public Criteria andPasswordIsNull() {
            addCriterion("password is null");
            return (Criteria) this;
        }

        public Criteria andPasswordIsNotNull() {
            addCriterion("password is not null");
            return (Criteria) this;
        }

        public Criteria andPasswordEqualTo(String value) {
            addCriterion("password =", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotEqualTo(String value) {
            addCriterion("password <>", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordGreaterThan(String value) {
            addCriterion("password >", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordGreaterThanOrEqualTo(String value) {
            addCriterion("password >=", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordLessThan(String value) {
            addCriterion("password <", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordLessThanOrEqualTo(String value) {
            addCriterion("password <=", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordLike(String value) {
            addCriterion("password like", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotLike(String value) {
            addCriterion("password not like", value, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordIn(List<String> values) {
            addCriterion("password in", values, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotIn(List<String> values) {
            addCriterion("password not in", values, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordBetween(String value1, String value2) {
            addCriterion("password between", value1, value2, "password");
            return (Criteria) this;
        }

        public Criteria andPasswordNotBetween(String value1, String value2) {
            addCriterion("password not between", value1, value2, "password");
            return (Criteria) this;
        }

        public Criteria andNameIsNull() {
            addCriterion("name is null");
            return (Criteria) this;
        }

        public Criteria andNameIsNotNull() {
            addCriterion("name is not null");
            return (Criteria) this;
        }

        public Criteria andNameEqualTo(String value) {
            addCriterion("name =", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotEqualTo(String value) {
            addCriterion("name <>", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameGreaterThan(String value) {
            addCriterion("name >", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameGreaterThanOrEqualTo(String value) {
            addCriterion("name >=", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameLessThan(String value) {
            addCriterion("name <", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameLessThanOrEqualTo(String value) {
            addCriterion("name <=", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameLike(String value) {
            addCriterion("name like", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotLike(String value) {
            addCriterion("name not like", value, "name");
            return (Criteria) this;
        }

        public Criteria andNameIn(List<String> values) {
            addCriterion("name in", values, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotIn(List<String> values) {
            addCriterion("name not in", values, "name");
            return (Criteria) this;
        }

        public Criteria andNameBetween(String value1, String value2) {
            addCriterion("name between", value1, value2, "name");
            return (Criteria) this;
        }

        public Criteria andNameNotBetween(String value1, String value2) {
            addCriterion("name not between", value1, value2, "name");
            return (Criteria) this;
        }

        public Criteria andAgeIsNull() {
            addCriterion("age is null");
            return (Criteria) this;
        }

        public Criteria andAgeIsNotNull() {
            addCriterion("age is not null");
            return (Criteria) this;
        }

        public Criteria andAgeEqualTo(Integer value) {
            addCriterion("age =", value, "age");
            return (Criteria) this;
        }

        public Criteria andAgeNotEqualTo(Integer value) {
            addCriterion("age <>", value, "age");
            return (Criteria) this;
        }

        public Criteria andAgeGreaterThan(Integer value) {
            addCriterion("age >", value, "age");
            return (Criteria) this;
        }

        public Criteria andAgeGreaterThanOrEqualTo(Integer value) {
            addCriterion("age >=", value, "age");
            return (Criteria) this;
        }

        public Criteria andAgeLessThan(Integer value) {
            addCriterion("age <", value, "age");
            return (Criteria) this;
        }

        public Criteria andAgeLessThanOrEqualTo(Integer value) {
            addCriterion("age <=", value, "age");
            return (Criteria) this;
        }

        public Criteria andAgeIn(List<Integer> values) {
            addCriterion("age in", values, "age");
            return (Criteria) this;
        }

        public Criteria andAgeNotIn(List<Integer> values) {
            addCriterion("age not in", values, "age");
            return (Criteria) this;
        }

        public Criteria andAgeBetween(Integer value1, Integer value2) {
            addCriterion("age between", value1, value2, "age");
            return (Criteria) this;
        }

        public Criteria andAgeNotBetween(Integer value1, Integer value2) {
            addCriterion("age not between", value1, value2, "age");
            return (Criteria) this;
        }

        public Criteria andSexIsNull() {
            addCriterion("sex is null");
            return (Criteria) this;
        }

        public Criteria andSexIsNotNull() {
            addCriterion("sex is not null");
            return (Criteria) this;
        }

        public Criteria andSexEqualTo(Boolean value) {
            addCriterion("sex =", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexNotEqualTo(Boolean value) {
            addCriterion("sex <>", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexGreaterThan(Boolean value) {
            addCriterion("sex >", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexGreaterThanOrEqualTo(Boolean value) {
            addCriterion("sex >=", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexLessThan(Boolean value) {
            addCriterion("sex <", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexLessThanOrEqualTo(Boolean value) {
            addCriterion("sex <=", value, "sex");
            return (Criteria) this;
        }

        public Criteria andSexIn(List<Boolean> values) {
            addCriterion("sex in", values, "sex");
            return (Criteria) this;
        }

        public Criteria andSexNotIn(List<Boolean> values) {
            addCriterion("sex not in", values, "sex");
            return (Criteria) this;
        }

        public Criteria andSexBetween(Boolean value1, Boolean value2) {
            addCriterion("sex between", value1, value2, "sex");
            return (Criteria) this;
        }

        public Criteria andSexNotBetween(Boolean value1, Boolean value2) {
            addCriterion("sex not between", value1, value2, "sex");
            return (Criteria) this;
        }

        public Criteria andBirthdayIsNull() {
            addCriterion("birthday is null");
            return (Criteria) this;
        }

        public Criteria andBirthdayIsNotNull() {
            addCriterion("birthday is not null");
            return (Criteria) this;
        }

        public Criteria andBirthdayEqualTo(Date value) {
            addCriterionForJDBCDate("birthday =", value, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayNotEqualTo(Date value) {
            addCriterionForJDBCDate("birthday <>", value, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayGreaterThan(Date value) {
            addCriterionForJDBCDate("birthday >", value, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayGreaterThanOrEqualTo(Date value) {
            addCriterionForJDBCDate("birthday >=", value, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayLessThan(Date value) {
            addCriterionForJDBCDate("birthday <", value, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayLessThanOrEqualTo(Date value) {
            addCriterionForJDBCDate("birthday <=", value, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayIn(List<Date> values) {
            addCriterionForJDBCDate("birthday in", values, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayNotIn(List<Date> values) {
            addCriterionForJDBCDate("birthday not in", values, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayBetween(Date value1, Date value2) {
            addCriterionForJDBCDate("birthday between", value1, value2, "birthday");
            return (Criteria) this;
        }

        public Criteria andBirthdayNotBetween(Date value1, Date value2) {
            addCriterionForJDBCDate("birthday not between", value1, value2, "birthday");
            return (Criteria) this;
        }

        public Criteria andCreatedIsNull() {
            addCriterion("created is null");
            return (Criteria) this;
        }

        public Criteria andCreatedIsNotNull() {
            addCriterion("created is not null");
            return (Criteria) this;
        }

        public Criteria andCreatedEqualTo(Date value) {
            addCriterion("created =", value, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedNotEqualTo(Date value) {
            addCriterion("created <>", value, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedGreaterThan(Date value) {
            addCriterion("created >", value, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedGreaterThanOrEqualTo(Date value) {
            addCriterion("created >=", value, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedLessThan(Date value) {
            addCriterion("created <", value, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedLessThanOrEqualTo(Date value) {
            addCriterion("created <=", value, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedIn(List<Date> values) {
            addCriterion("created in", values, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedNotIn(List<Date> values) {
            addCriterion("created not in", values, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedBetween(Date value1, Date value2) {
            addCriterion("created between", value1, value2, "created");
            return (Criteria) this;
        }

        public Criteria andCreatedNotBetween(Date value1, Date value2) {
            addCriterion("created not between", value1, value2, "created");
            return (Criteria) this;
        }

        public Criteria andUpdatedIsNull() {
            addCriterion("updated is null");
            return (Criteria) this;
        }

        public Criteria andUpdatedIsNotNull() {
            addCriterion("updated is not null");
            return (Criteria) this;
        }

        public Criteria andUpdatedEqualTo(Date value) {
            addCriterion("updated =", value, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedNotEqualTo(Date value) {
            addCriterion("updated <>", value, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedGreaterThan(Date value) {
            addCriterion("updated >", value, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedGreaterThanOrEqualTo(Date value) {
            addCriterion("updated >=", value, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedLessThan(Date value) {
            addCriterion("updated <", value, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedLessThanOrEqualTo(Date value) {
            addCriterion("updated <=", value, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedIn(List<Date> values) {
            addCriterion("updated in", values, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedNotIn(List<Date> values) {
            addCriterion("updated not in", values, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedBetween(Date value1, Date value2) {
            addCriterion("updated between", value1, value2, "updated");
            return (Criteria) this;
        }

        public Criteria andUpdatedNotBetween(Date value1, Date value2) {
            addCriterion("updated not between", value1, value2, "updated");
            return (Criteria) this;
        }
    }

    public static class Criteria extends GeneratedCriteria {

        protected Criteria() {
            super();
        }
    }

    public static class Criterion {
        private String condition;

        private Object value;

        private Object secondValue;

        private boolean noValue;

        private boolean singleValue;

        private boolean betweenValue;

        private boolean listValue;

        private String typeHandler;

        public String getCondition() {
            return condition;
        }

        public Object getValue() {
            return value;
        }

        public Object getSecondValue() {
            return secondValue;
        }

        public boolean isNoValue() {
            return noValue;
        }

        public boolean isSingleValue() {
            return singleValue;
        }

        public boolean isBetweenValue() {
            return betweenValue;
        }

        public boolean isListValue() {
            return listValue;
        }

        public String getTypeHandler() {
            return typeHandler;
        }

        protected Criterion(String condition) {
            super();
            this.condition = condition;
            this.typeHandler = null;
            this.noValue = true;
        }

        protected Criterion(String condition, Object value, String typeHandler) {
            super();
            this.condition = condition;
            this.value = value;
            this.typeHandler = typeHandler;
            if (value instanceof List<?>) {
                this.listValue = true;
            } else {
                this.singleValue = true;
            }
        }

        protected Criterion(String condition, Object value) {
            this(condition, value, null);
        }

        protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
            super();
            this.condition = condition;
            this.value = value;
            this.secondValue = secondValue;
            this.typeHandler = typeHandler;
            this.betweenValue = true;
        }

        protected Criterion(String condition, Object value, Object secondValue) {
            this(condition, value, secondValue, null);
        }
    }
}

接口

package it.heima.mapper;

import it.heima.domain.User;
import it.heima.domain.UserExample;

import java.util.List;

public interface UserMapper {
    int deleteByPrimaryKey(Long id);

    int insert(User record);

    int insertSelective(User record);

    List<User> selectByExample(UserExample example);

    User selectByPrimaryKey(Long id);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);

    //批量删除
    public  void deleteByBatch(List<Long> ids);

}

接口的映射文件:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="it.heima.mapper.UserMapper">
  <resultMap id="BaseResultMap" type="it.heima.domain.User">
    <id column="id" jdbcType="BIGINT" property="id" />
    <result column="user_name" jdbcType="VARCHAR" property="userName" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="name" jdbcType="VARCHAR" property="name" />
    <result column="age" jdbcType="INTEGER" property="age" />
    <result column="sex" jdbcType="BIT" property="sex" />
    <result column="birthday" jdbcType="DATE" property="birthday" />
    <result column="created" jdbcType="TIMESTAMP" property="created" />
    <result column="updated" jdbcType="TIMESTAMP" property="updated" />
  </resultMap>
  <sql id="Example_Where_Clause">
    <where>
      <foreach collection="oredCriteria" item="criteria" separator="or">
        <if test="criteria.valid">
          <trim prefix="(" prefixOverrides="and" suffix=")">
            <foreach collection="criteria.criteria" item="criterion">
              <choose>
                <when test="criterion.noValue">
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue">
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue">
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue">
                  and ${criterion.condition}
                  <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List">
    id, user_name, password, name, age, sex, birthday, created, updated
  </sql>
  <select id="selectByExample" parameterType="it.heima.domain.UserExample" resultMap="BaseResultMap">
    select
    <if test="distinct">
      distinct
    </if>
    'false' as QUERYID,
    <include refid="Base_Column_List" />
    from tb_user
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null">
      order by ${orderByClause}
    </if>
    <if test="pagenum != 0 or numperpage !=0">
      limit #{pagenum},#{numperpage}
    </if>
  </select>
  <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from tb_user
    where id = #{id,jdbcType=BIGINT}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
    delete from tb_user
    where id = #{id,jdbcType=BIGINT}
  </delete>
  <insert id="insert" parameterType="it.heima.domain.User">
    insert into tb_user (id, user_name, password, 
      name, age, sex, birthday, 
      created, updated)
    values (#{id,jdbcType=BIGINT}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER}, #{sex,jdbcType=BIT}, #{birthday,jdbcType=DATE}, 
      #{created,jdbcType=TIMESTAMP}, #{updated,jdbcType=TIMESTAMP})
  </insert>
  <insert id="insertSelective" parameterType="it.heima.domain.User">
    insert into tb_user
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="id != null">
        id,
      </if>
      <if test="userName != null">
        user_name,
      </if>
      <if test="password != null">
        password,
      </if>
      <if test="name != null">
        name,
      </if>
      <if test="age != null">
        age,
      </if>
      <if test="sex != null">
        sex,
      </if>
      <if test="birthday != null">
        birthday,
      </if>
      <if test="created != null">
        created,
      </if>
      <if test="updated != null">
        updated,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="id != null">
        #{id,jdbcType=BIGINT},
      </if>
      <if test="userName != null">
        #{userName,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="name != null">
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        #{age,jdbcType=INTEGER},
      </if>
      <if test="sex != null">
        #{sex,jdbcType=BIT},
      </if>
      <if test="birthday != null">
        #{birthday,jdbcType=DATE},
      </if>
      <if test="created != null">
        #{created,jdbcType=TIMESTAMP},
      </if>
      <if test="updated != null">
        #{updated,jdbcType=TIMESTAMP},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="it.heima.domain.User">
    update tb_user
    <set>
      <if test="userName != null">
        user_name = #{userName,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        password = #{password,jdbcType=VARCHAR},
      </if>
      <if test="name != null">
        name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        age = #{age,jdbcType=INTEGER},
      </if>
      <if test="sex != null">
        sex = #{sex,jdbcType=BIT},
      </if>
      <if test="birthday != null">
        birthday = #{birthday,jdbcType=DATE},
      </if>
      <if test="created != null">
        created = #{created,jdbcType=TIMESTAMP},
      </if>
      <if test="updated != null">
        updated = #{updated,jdbcType=TIMESTAMP},
      </if>
    </set>
    where id = #{id,jdbcType=BIGINT}
  </update>
  <update id="updateByPrimaryKey" parameterType="it.heima.domain.User">
    update tb_user
    set user_name = #{userName,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      name = #{name,jdbcType=VARCHAR},
      age = #{age,jdbcType=INTEGER},
      sex = #{sex,jdbcType=BIT},
      birthday = #{birthday,jdbcType=DATE},
      created = #{created,jdbcType=TIMESTAMP},
      updated = #{updated,jdbcType=TIMESTAMP}
    where id = #{id,jdbcType=BIGINT}
  </update>

  <!--批量删除功能-->
  <delete id="deleteByBatch">
    delete from tb_user
    where id in 
      <foreach collection="ids" item="id" separator="," open="(" close=")">
        #{id}
      </foreach>
  </delete>

</mapper>

mybatis核心配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>

    <plugins>
        <!-- 配置分页助手的插件 -->
        <plugin interceptor="com.github.pagehelper.PageHelper">
            <!-- 指定数据库方言 -->
            <property name="dialect" value="mysql"/>
            <!-- 设置为true时，查询结果中会查询出总条数信息 -->
            <property name="rowBoundsWithCount" value="true"/>
        </plugin>
    </plugins>
</configuration>

spring_dao配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
        <!--配置数据库-->
        <context:property-placeholder location="classpath:jdbc.properties"/>
        <bean id="dataSource01" class="com.alibaba.druid.pool.DruidDataSource">
            <property name="driverClassName" value="${jdbc.driverClassName}"/>
            <property name="url" value="${jdbc.url}"/>
            <property name="username" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>

        <!--配置sqlsessionFactory-->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <!--引入数据库-->
            <property name="dataSource" ref="dataSource01"/>
            <!--引入mybatis核心配置文件-->
            <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
            <!--别名无需引用,因为自动生成的都用全路径-->
            <property name="typeAliasesPackage" value="it.heima.domain"/>
        </bean>

        <!--自动扫描接口包,生成实现类-->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="it.heima.mapper"/>
        </bean>
</beans>

------------------------------------------------------业务层如下----------------------------------------------------------------------------------------------

思路:接口---->接口的实现类------>配置文件

接口:

import it.heima.domain.DataGridResult;
import it.heima.domain.User;

import java.util.List;

public interface UserService {
    public DataGridResult<User> queryUserListByPage(int pagenum,int numperpage);

    void addUser(User user);

    void editUser(User user);


    void deleteUsers(List<Long> ids);
}

接口的实现类

package it.heima.service.Impl;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import it.heima.domain.DataGridResult;
import it.heima.domain.User;
import it.heima.domain.UserExample;
import it.heima.mapper.UserMapper;
import it.heima.service.UserService;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service("userService")
@Transactional
public class UserServiceImpl implements UserService {
    @Value("#{userMapper}")
    private UserMapper userMapper;

    //分页查询功能
    @Override
    public DataGridResult<User> queryUserListByPage(int pagenum, int numperpage) {
        //使用分页助手,传入两个参数,分页助手会通过过滤器将这两个参数加入sql语句
        PageHelper.startPage(pagenum,numperpage);
        //这里我们使用了逆向工程自动生成,查询全部
        UserExample userExample = new UserExample();
        List<User> userList=userMapper.selectByExample(userExample);
        //将通过分页助手过滤的userlist交给分页对象处理.
        PageInfo<User> pageInfo = new PageInfo<User>(userList);
        //返回页面需要的数据
        DataGridResult<User> dataGridResult = new DataGridResult<User>(pageInfo.getTotal(), userList);
        return dataGridResult;
    }

    //新增功能
    @Override
    public void addUser(User user) {
        userMapper.insert(user);

    }

    //修改功能
    @Override
    public void editUser(User user) {
        userMapper.updateByPrimaryKey(user);
    }

    //批量删除功能
    @Override
    public void deleteUsers(List<Long> ids) {
        userMapper.deleteByBatch(ids);
    }
}

spring_service配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
        <!--配置userservice,扫描实现-->
        <context:component-scan base-package="it.heima.service.Impl"/>

        <!--开启事务,连接数据库-->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource01"/>
        </bean>

        <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

------------------------------------------------以下是mvc层---------------------------------------------------------------------------------------------

思路:  web.xml---->springmvc--->controller ---视图

web.xml
<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <!--&lt;!&ndash;指定实例化的对象到spring中&ndash;&gt;-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring/applicationContext*.xml</param-value>
  </context-param>

  <!--项目启动后里面实例化spring容器-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!--1 dispatcher前端控制器-->
  <servlet>
    <servlet-name>springssm</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--3 配置handlemaper handleradapter controller viewRosove-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc/applicationContext_mvc.xml</param-value>
    </init-param>
    <!--2 项目启动后就实例化servlet-->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>springssm</servlet-name>
    <!--除jsp之外,其余都拦截-->
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

springmvc

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

        <!--开启handlemapper handleadapter-->
        <mvc:annotation-driven/>
        <!--controller配置-->
        <context:component-scan base-package="it.heima.controller"/>
        <!--配置视图解析器-->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <!--前缀-->
            <property name="prefix" value="/WEB-INF/views/"/>
            <!--后缀-->
            <property name="suffix" value=".jsp"/>

        </bean>

        <!--配置放行静态资源,交给web服务器处理,所以页面展示就出现效果-->
         <mvc:default-servlet-handler/>
</beans>

cotroller

pagecontroller

package it.heima.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

//这是负责页面跳转的控制器
@Controller
@RequestMapping("page")
public class PageCotroller {
    @RequestMapping("{haha}")
    public String tiaozhuan(@PathVariable("haha") String pathpage){
        return pathpage;
    }
}

usercontroller

package it.heima.controller;

import it.heima.domain.DataGridResult;
import it.heima.domain.User;
import it.heima.service.UserService;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Controller
@RequestMapping("user")
public class UserController {
    @Value("#{userService}")
    private UserService userService;
    //因为users.jspzai web-inf里面,不能直接访问,可以用跳转间接访问
    @RequestMapping("users")
    public String toUsers(){
        return "users";
    }
    //分页展示信息
    @RequestMapping("list")
    @ResponseBody
    //网页需要DataGridResult格式的数据转成json
    public DataGridResult<User>  queryUserlistByPage(@RequestParam(value = "page",defaultValue = "1") int pagenum
                                                   , @RequestParam(value = "rows",defaultValue = "5") int numperpage){
        DataGridResult<User> userDataGridResult = userService.queryUserListByPage(pagenum, numperpage);
        return userDataGridResult;

    }

    //新增功能
    @RequestMapping("save")
    @ResponseBody
    //将表单提交的数据自动封装到user中
    public Map addUser(@Param("user") User user){
        //System.out.println(user);说明拿到前端传的数据
        try {
            // 调用业务层完成添加用户
            userService.addUser(user);
            Map map = new HashMap();
            map.put("status", "200");
            return map;
        }catch (Exception e) {
            e.printStackTrace();
            Map map = new HashMap();
            map.put("status", "500");
            return map;
        }
    }

    //编辑功能
    @RequestMapping("edit")
    @ResponseBody
    public Map edite(@Param("user") User user){

        try{
            userService.editUser(user);
            Map map = new HashMap();
            map.put("status", "200");
            return map;
        }catch (Exception e){
            e.printStackTrace();
            Map map = new HashMap();
            map.put("status", "500");
            return map;
        }
    }

    //批量及单独删除功能
    @RequestMapping("delete")
    @ResponseBody
    public Map delte(@RequestParam("ids") List<Long> ids){
        System.out.println(ids);

        try{
            userService.deleteUsers(ids);
            Map map = new HashMap();
            map.put("status", "200");
            return map;
        }catch (Exception e){
            e.printStackTrace();
            Map map = new HashMap();
            map.put("status", "500");
            return map;
        }
    }
}

视图:

最终实现的功能(增删改查)