如何使用Java创建，编辑和更改表？(How to Create, edit & alter table using Java?)
问题描述 (Problem Description)
如何编辑(添加或更新)表的列以及如何删除表？
解决方案 (Solution)
以下示例使用create，alter＆drop SQL命令来创建，编辑或删除表。import java.sql.*;
public class jdbcConn {
public static void main(String[] args) throws Exception {
Class.forName("org.apache.derby.jdbc.ClientDriver");
Connection con = DriverManager.getConnection(
"jdbc:derby://localhost:1527/testDb","username", "password");
Statement stmt = con.createStatement();
String query ="CREATE TABLE employees(id INTEGER PRIMARY KEY, first_name CHAR(50), last_name CHAR(75))";
stmt.execute(query);
System.out.println("Employee table created");
String query1 = "aLTER TABLE employees ADD address CHAR(100) ";
String query2 = "ALTER TABLE employees DROP COLUMN last_name";
stmt.execute(query1);
stmt.execute(query2);
System.out.println("Address column added to the table & last_name column removed from the table");
String query3 = "drop table employees";
stmt.execute(query3);
System.out.println("Employees table removed");
}
}
结果 (Result)
上面的代码示例将产生以下结果。 结果可能会有所不同。Employee table created
Address column added to the table & last_name
column removed from the table
Employees table removed from the database