传入参数param，查找数据库中有没有param对应的记录
private static final String SQL_GET = "SELECT count(*) as c FROM alarm t %s;";
public boolean exist(String param) {
boolean exist = false;
String condition = "";
if (param.equals("id")) {
condition = "WHERE t.id = '" + id + "'";
} else if (param.equals("name")) {
condition = "WHERE t.name = '" + name + "'";
} else {
condition = "WHERE t.meter = '" + meter + "'";
}
String sql = String.format(SQL_GETALARMEXIST, condition);
try {
Connection conn = DriverManager.getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = sm.executeQuery(sql);
while (rs.next()) {
exist = rs.getInt("c") > 0;
}
} catch (Exception e) {
e.printStack();
} finally {
conn.close(sm);
}
return exist;
}
传入id则以id拼接WHERE子句，依此类图，但是总觉得不够灵活，在不使用其他框架的前提下，有没有什么更灵活的实现方式呢？