<?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>
<!--定义别名 注意typeAliases一定要在environments之前-->
<typeAliases>
<typeAlias type="jike.book.pojo.JiKeUser" alias="JiKeUser"/>
<typeAlias type="jike.book.pojo.Author" alias="Author"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC">
</transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/jikebook"/>
<property name="username" value="root"/>
<property name="password" value="*****"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="jike/book/map/jikeUser.xml"/>
</mappers>
</configuration>

<?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="/">
<select id="selectSQL" resultType="JiKeUser" parameterType="JiKeUser">
SELECT * FROM jikebook.jikeuser
WHERE 1=1
<if test="userName!='admin'">
AND password=#{password}
</if>
</select>
</mapper>

package jike.book.test;
import jike.book.pojo.JiKeUser;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.Reader;
import java.util.List;
/**
* DateTime: 2016/9/6 13:36
* 功能：
* 思路：
*/
public class TestSQL {
public static void main(String[] args) {
// 资源路径
String resource="jike/book/map/MyBatisConfig.xml";
Reader reader=null;
SqlSession session;
try {
reader= Resources.getResourceAsReader(resource);
} catch ( IOException e ) {
e.printStackTrace();
}
SqlSessionFactory sqlMapper=new SqlSessionFactoryBuilder().build(reader);
session=sqlMapper.openSession();
JiKeUser jiKeUser=new JiKeUser();
jiKeUser.setPassword("123456");
List<JiKeUser> userList=session.selectList("selectSQL",jiKeUser);
for ( JiKeUser user:userList ) {
System.out.println("userName:"+user.getUserName());
}
session.close();
}
}

<select id="selectJiKeUserChoose" resultType="JiKeUser" parameterType="JiKeUser">
select * from jikeuser where 1=1
<choose>
<when test="userName!=null">
and userName like #{userName}
</when>
<when test="id!=0">
and id =#{id}
</when>
<otherwise>
and password is not null
</otherwise>
</choose>
</select>

package jike.book.test;
import jike.book.pojo.JiKeUser;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.Reader;
import java.util.List;
/**
* DateTime: 2016/9/6 13:36
* 功能：
* 思路：
*/
public class TestSQL {
public static void main(String[] args) {
// 资源路径
String resource="jike/book/map/MyBatisConfig.xml";
Reader reader=null;
SqlSession session;
try {
reader= Resources.getResourceAsReader(resource);
} catch ( IOException e ) {
e.printStackTrace();
}
SqlSessionFactory sqlMapper=new SqlSessionFactoryBuilder().build(reader);
session=sqlMapper.openSession();
JiKeUser jiKeUser=new JiKeUser();
jiKeUser.setUserName("YEN");
List<JiKeUser> userList=session.selectList("selectJiKeUserChoose",jiKeUser);
for ( JiKeUser user:userList ) {
System.out.println("userName:"+user.getUserName());
}
session.close();
}
}

<select id="selectJiKeUserWhere" resultType="JiKeUser" parameterType="JiKeUser">
select * from jikeuser
<where>
<if test="userName!=null">
and userName like #{userName}
</if>
<if test="id!=null">
and id =#{id}
</if>
</where>
</select>

<update id="updateJiKeUserSet" parameterType="JiKeUser">
update JiKeUser
<set>
<if test="userName != null">userName=#{userName},</if>
<if test="password != null">password=#{password},</if>
</set>
where id=#{id}
</update>

<update id="updateUserTrim" parameterType="JiKeUser">
UPDATE JiKeUser
<trim prefix="SET" suffixOverrides="," suffix="WHERE id = #{id}" >
<if test="userName != null and userName != '' ">
userName = #{userName},
</if>
<if test="password != null and password != '' ">
password=#{password},
</if>
</trim>
</update>

<select id="selectJiKeUserForeach" resultType="JiKeUser" parameterType="list">
select * from jikeuser
<where>
id in
<foreach item="item" index="index" collection="list"
open="(" separator="," close=")">
#{item}
</foreach>
</where>
</select>