IBATIS简单操作

1创建数据库

create table user
(
 id int auto_increment primary key,
 username varchar(32),
 password varchar(32)
);

select * from user;

2
添加IBATIS的jar包；

3添加配置文件sqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE sqlMapConfig      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">

<sqlMapConfig>

  <transactionManager type="JDBC" commitRequired="false">
    <dataSource type="SIMPLE">
      <property name="JDBC.Driver" value="com.mysql.jdbc.Driver"/>
      <property name="JDBC.ConnectionURL" value="jdbc:mysql://localhost:3306/mydb"/>
      <property name="JDBC.Username" value="root"/>
      <property name="JDBC.Password" value="admin"/>
    </dataSource>
  </transactionManager>

  <sqlMap resource="com/wangyu/data/User.xml"/>
</sqlMapConfig>

4实体类User.java

package com.wangyu.domain;
public class User {
	private Integer id;
	private String username;
	private String password;
	// Constructors
	public User() {
	}
	public Integer getId() {
		return this.id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getUsername() {
		return this.username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return this.password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

5对应的.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE sqlMap      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-2.dtd">

<sqlMap namespace="User">

  <!-- Use type aliases to avoid typing the full classname every time. -->
  <typeAlias alias="User" type="com.wangyu.domain.User"/>

  <!-- Select with no parameters using the result map for Account class. -->
  <select id="selectAllUsers" resultClass="User">
    select * from user
  </select>

  <!-- A simpler select example without the result map.  Note the 
       aliases to match the properties of the target result class. -->
  <select id="selectUserById" parameterClass="int" resultClass="User">
    select
      id as id,username as UserName ,password as Password
    from user
    where id = #id#
  </select>
   
  <!-- Insert example, using the Account parameter class -->
  <insert id="insertUser" parameterClass="User">
    insert into user (username,password) values (#username#,#password#)
  </insert>

  <!-- Update example, using the Account parameter class -->
  <update id="updateUser" parameterClass="User" >
    update user set username = #username#,password=#password# where id = #id#
  </update>

  <!-- Delete example, using an integer as the parameter class -->
  <delete id="deleteUserById" parameterClass="int">
    delete from user where id = #id#
  </delete>

</sqlMap>

6.DAO类SimpleExample

package com.wangyu.data;

import java.io.IOException;
import java.io.Reader;
import java.sql.SQLException;
import java.util.List;

import com.ibatis.common.resources.Resources;
import com.ibatis.sqlmap.client.SqlMapClient;
import com.ibatis.sqlmap.client.SqlMapClientBuilder;
import com.wangyu.domain.User;

public class SimpleExample {

	  private static SqlMapClient sqlMapper;

	  static {
	    try {
	      Reader reader = Resources.getResourceAsReader("com/wangyu/data/SqlMapConfig.xml");
	      sqlMapper = SqlMapClientBuilder.buildSqlMapClient(reader);
	      reader.close(); 
	    } catch (IOException e) {
	      // Fail fast.
	      throw new RuntimeException("Something bad happened while building the SqlMapClient instance." + e, e);
	    }
	  }

	  public static List<User> selectAllUser () throws SQLException {
	    return sqlMapper.queryForList("selectAllUsers");
	  }

	  public static User selectUserById  (int id) throws SQLException {
	    return (User) sqlMapper.queryForObject("selectUserById", id);
	  }

	  public static void insertUser (User user) throws SQLException {
	    sqlMapper.insert("insertUser", user);
	  }

	  public static void updateUser (User user) throws SQLException {
	    sqlMapper.update("updateUser", user);
	  }

	  public static void deleteUser (int id) throws SQLException {
	    sqlMapper.delete("deleteUserById", id);
	  }

}

7.测试类

package com.wangyu.data;

import java.util.Iterator;
import java.util.List;

import com.wangyu.domain.User;

public class Test {

	public static void main(String[] args)throws Exception {
		User u =new User();
		
		//添加用户
//		for (int i =1;i<10;i++){
//			u.setPassword("password"+i);
//			u.setUsername("username"+i);
//			SimpleExample.insertUser(u);
//		}
		
		//删除用户 -->没有不会抛出异常
		SimpleExample.deleteUser(2);
		
		//修改用户
		User user =SimpleExample.selectUserById(6) ;
		user.setPassword("zhuangsan");
		user.setUsername("zhangsan");
		SimpleExample.updateUser(user);
		//System.out.println(user.getPassword());
		
		//查询所有用户
		List<User> list = SimpleExample.selectAllUser();
		Iterator<User> rt=list.iterator();
		while(rt.hasNext()){
			User us = (User)rt.next();
			System.out.println(us.getId()+"--->"+us.getPassword()+"--->"+us.getUsername());
		}
		
		//按id查询 -->没有数据 -->空指针异常
		User us = SimpleExample.selectUserById(6);
		System.out.println(us.getUsername());
	}

}

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iBATIS声明事事务

	public static void insertUser(User user){
		try {
			sqlMapper.startTransaction();
			sqlMapper.insert("insertUser", user);
			sqlMapper.commitTransaction();
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			try {
				sqlMapper.endTransaction();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}