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转载：http://blog.csdn.net/ppby2002/article/details/20611737
<?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="com.lee.UserMapper">
<!--返回单一对象-->
<select id="selectName" resultType="com.lee.User">
<![CDATA[
select user_name userName from user_table where user_id = #{userId}
]]>
</select>
<!--返回结果格式 Map<字段名称，字段值>-->
<select id="selectByName" resultType="hashMap" parameterType="string">
<![CDATA[
SELECT * from user_table where user_name=#{userName}
]]>
</select>
<!--调用存储过程-->
<select id="selectUserFromStoreProcedure" statementType="CALLABLE">
<![CDATA[
{call my_pack.my_proc(
#{userId,mode=IN,jdbcType=VARCHAR,javaType=string},
#{userName,mode=OUT,jdbcType=FLOAT,javaType=string})}
]]>
</select>
<!--返回List<User>-->
<select id="selectUsers" resultType="com.lee.User">
<![CDATA[
select user_id userId, user_name userName from user_table
]]>
</select>
<!--重用sql-->
<sql id="subQuery">
<![CDATA[
WITH MY_SUB_QUERY as (
select ‘lee‘ as user_name, ‘1‘ as user_id from dual
union select ‘lee1‘ ,‘2‘ from dual
)
]]>
</sql>
<!--动态sql-->
<sql id="selectOther">
<include refid="subQuery" />
<![CDATA[
SELECT t.other_id otherId, t.other_name otherName, t.other_flag otherFlag FROM OtherTable t
INNER JOIN MY_SUB_QUERY mapper ON mapper.user_id = t.user_id
]]>
<if test="filterFlag==true">
<![CDATA[
and t.other_flag = ‘Y‘
]]>
</if>
<!--
另一个if段
<if test="flag1==true">
...
</if>
-->
<!--
使用choose语句,flag1是从mapper方法中传递的参数，如 @Param("flag1") String flag1
<choose>
<when test="flag1 == ‘Y‘">
t1.flag1 AS flag
FROM table1 t1
</when>
<otherwise>
t2.flag2 AS flag
FROM table2 t2
</otherwise>
</choose>
-->
</sql>
<!--返回数字-->
<select id="selectCount" resultType="java.lang.Long">
<![CDATA[
SELECT count(*) FROM user_table
]]>
</select>
<!--Map参数, 格式Map<参数名称，参数值>-->
<select id="selectUser" parameterType="java.util.HashMap" resultType="com.lee.User">
<![CDATA[
SELECT user_id userId, user_name userName from user_table
where user_id=#{userId} and user_name = #{userName}
]]>
</select>
</mapper>
--------------------------------------------------这个分割线的作用是要显示下边的Java对象例子--------------------------------------------------
public class User {
private int userId;
private String userName;
public String getUserId() {return userId}
public void setUserId(int userId) {this.userId=userId}
public String getUserName() {return userName}
public void setUserName(String userName) {this.userName=userName}
}
--------------------------------------------------这个分割线的作用是要显示下边的Mapper对象例子--------------------------------------------------
@Repository
public interface UserMapper {
public User selectName(@Param("userId") String userId);
public List<Map<String,Object>> selectByName(@Param("userName")String userName);
<!--Map<字段名称，字段值>-->
public void selectUserFromStoreProcedure(Map<String,Object> map);
public List<User> selectUsers();
public OtherUser selectOther();
public int selectCount();
public User selectUser(Map<String,Object> map);
}
--------------------------------------------------这个分割线的作用是要显示另一些配置例子--------------------------------------------------
<!--用映射配置查询sql-->
<resultMap id="UserMap" type="com.lee.User">
<result column="user_id" property="userId"/>
<result column="user_name" property="userName"/>
</resultMap>
<select id="selectName" resultMap="UserMap">
<![CDATA[
select user_name from user_table where user_id = #{userId}
]]>
</select>
<!--重用映射配置并连接到其它结果集查询-->
<resultMap id="OtherUserMap" type="com.lee.OtherUser" extends="UserMap">
<!--多个查询条件用逗号隔开，如userId=user_id,userName=user_name-->
<collection property="ownedItems" select="selectItems" column="userId=user_id"/>
</resultMap>
<select id="selectItems" resultType="com.lee.UserItem">
SELECT * FROM user_item_table WHERE user_id = #{userId}
</select>
public class OtherUser extends User {
private List<UserItem> ownedItems;
public List<UserItem> getOwnedItems() {return ownedItems}
public void setOwnedItems(List<UserItem> userId) {this.ownedItems=ownedItems}
}
--------------------------------------------------这个分割线的作用是要显示另一个重用子查询配置例子--------------------------------------------------
<mapper namespace="mapper.namespace">
<sql id="selectTable1">
<![CDATA[
select f1, f2, f3 from table1 where 1=1
]]>
</sql>
<select id="getStandardAgents" resultMap="StandardAgent">
<include refid="mapper.namespace.selectTable1"/>
<![CDATA[
and f1 = ‘abc‘
]]>
</select>
</mapper>
--------------------------------------------------这个分割线的作用是要显示insert/update/delete配置例子--------------------------------------------------
<!--从Oracle序列中产生user_id, jdbcType=VARCHAR用于插入空值-->
<insert id="insertUser" parameterType="com.lee.User">
<selectKey keyProperty="user_id" resultType="string" order="BEFORE">
select db_seq.nextval as user_id from dual
</selectKey>
INSERT INTO
user_table(
user_id,
user_name,
) VALUES(
#{user_id},
#{user_name,jdbcType=VARCHAR}
)
</insert>
<update id="updateUser" parameterType="com.lee.User">
UPDATE user_table
SET user_name = #{userName,jdbcType=VARCHAR},
WHERE
user_id = #{userId}
</update>
<delete id="deleteUser" parameterType="com.lee.User">
DELETE user_table WHERE user_id = #{userId}
</delete>
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原文地址：http://www.cnblogs.com/wenlj/p/4641991.html
