Mybatis调用存储过程

一、返回结果集

以MySql分页为例

1.存储过程

DROP PROCEDURE IF EXISTS sp_pager;
CREATE PROCEDURE sp_pager(
IN currentPage int ,/*当前页*/
IN pageSize int,/*每页的记录数*/
OUT totalCount int /*总记录数*/
-- IN tableName varchar(100), /*表名*/
-- IN p_field varchar(300), /*查询的字段，逗号分隔*/
-- IN p_where varchar(500),/*查询条件*/
-- IN orderby varchar(300) /*排序*/
)
BEGIN
SET @startIndex=(currentPage-1)*pageSize;
SET @endIndex=pageSize;
SET @strSql=CONCAT('select id,user_name,user_age,user_sex',' from ','tb_user',
-- CASE IFNULL(p_where,'') WHEN '' THEN '' ELSE CONCAT(' where ',p_where) END,
-- CASE IFNULL(orderby,'') WHEN '' THEN '' ELSE CONCAT(' order by ',orderby) END,
' limit ',@startIndex,',',@endIndex);
/*预定义一个语句，并将它赋给stmtsql*/
PREPARE stmtsql FROM @strSql;
EXECUTE stmtsql;
/*释放一个预定义语句的资源*/
DEALLOCATE PREPARE stmtsql;

SET @strCount=CONCAT('select count(*) into @Rows_Total from ','tb_user');
PREPARE stmtcount FROM @strCount;
EXECUTE stmtcount;
DEALLOCATE PREPARE stmtcount;
SET totalCount=@Rows_Total;
/*计算总数也可以是下面这种方法*/
-- SELECT COUNT(*) INTO totalCount FROM tb_user;
END

测试存储过程：

CALL sp_pager(1,20,@totalCount);
SELECT @totalCount;

 

2.Mybatis配置文件

<resultMap type="java.util.HashMap" id="resultMap">
<result column="id" property="id" javaType="java.lang.Integer" jdbcType="INTEGER"/>
<result column="user_name" property="user_name" javaType="java.lang.String" jdbcType="VARCHAR"/>
<result column="user_sex" property="user_sex" javaType="java.lang.String" jdbcType="VARCHAR"/>
<result column="user_age" property="user_age" javaType="java.lang.Integer" jdbcType="INTEGER"/>
</resultMap>

<select id="getUserList" parameterType="java.util.Map" resultMap="resultMap" statementType="CALLABLE">
{call sp_pager(#{currentPage,jdbcType=INTEGER,mode=IN},
#{pageSize,jdbcType=INTEGER,mode=IN},
#{totalCount,jdbcType=INTEGER,mode=OUT})}
</select>

3.Action调用

@RequestMapping(value="/getUserList")
public ModelAndView getUserList(){
Map map=new HashMap();
map.put("currentPage", "1");
map.put("pageSize", "20");

List userList=userService.getUserList(map);
System.out.println(map.get("totalCount"));

ModelAndView mv=new ModelAndView();
//添加模型数据可以是任意的POJO对象
mv.addObject("userList",userList);
mv.setViewName("user/helloWorld");
return mv;
}

totalCount 从map中取出即可。

二、带输入输出参数的存储过程

DROP PROCEDURE IF EXISTS sp_sum;
CREATE PROCEDURE sp_sum(
IN num1 int,
IN num2 int,
OUT sum int
)
BEGIN
SET sum=num1+num2;
END

配置文件：

<parameterMap type="java.util.HashMap" id="testParameterMap">
<parameter property="num1" jdbcType="INTEGER" mode="IN"/>
<parameter property="num2" jdbcType="INTEGER" mode="IN"/>
<parameter property="sum" jdbcType="INTEGER" mode="OUT"/>
</parameterMap>

<update id="Sum" parameterMap="testParameterMap" statementType="CALLABLE">
{call sp_sum(?,?,?)}
</update>

Action：

@RequestMapping(value="/Sum")
public ModelAndView Sum(){
Map map=new HashMap();
map.put("num1", "1");
map.put("num2", "2");

userService.Sum(map);
System.out.println(map.get("sum"));

ModelAndView mv=new ModelAndView();
mv.setViewName("user/helloWorld");
return mv;
}

三、返回多个结果集

DROP PROCEDURE IF EXISTS sp_query;
CREATE PROCEDURE sp_query(
IN num1 int,
IN num2 int,
OUT sum int
)
BEGIN
SELECT id,user_name,user_sex,user_age from tb_user;
SELECT id,dept_name from tb_dept;
SET sum=num1+num2;
END

配置文件：

<resultMap type="java.util.HashMap" id="resultMap">
<result column="id" property="id" javaType="java.lang.Integer" jdbcType="INTEGER"/>
<result column="user_name" property="user_name" javaType="java.lang.String" jdbcType="VARCHAR"/>
<result column="user_sex" property="user_sex" javaType="java.lang.String" jdbcType="VARCHAR"/>
<result column="user_age" property="user_age" javaType="java.lang.Integer" jdbcType="INTEGER"/>
</resultMap>

<resultMap type="java.util.HashMap" id="deptMap">
<result column="id" property="id" javaType="java.lang.Integer" jdbcType="INTEGER"/>
<result column="dept_name" property="dept_name" javaType="java.lang.String" jdbcType="VARCHAR"/>
</resultMap>

<select id="getMutiList" parameterType="java.util.Map" resultMap="resultMap,deptMap" statementType="CALLABLE">
{call sp_query(#{num1,jdbcType=INTEGER,mode=IN},
#{num2,jdbcType=INTEGER,mode=IN},
#{sum,jdbcType=INTEGER,mode=OUT})}
</select>

Action：

@RequestMapping(value="/QueryList")
public ModelAndView QueryList(){
Map map=new HashMap();
map.put("num1", "1");
map.put("num2", "2");

List<List<Map>> dataList=userService.getMutiList(map);
if(dataList!=null && dataList.size()>0){
//总数
System.out.println("dataList.size="+dataList.size());
//遍历
for(int i=0;i<dataList.size();i++){
List<Map> list=dataList.get(i);
for(int j=0;j<list.size();j++){
Map m=(Map)list.get(j);
Iterator it=m.keySet().iterator();
while(it.hasNext()){
String key=it.next().toString();
System.out.println(key+"--------"+m.get(key));
}
System.out.println("");
}
}
}
System.out.println("sum="+map.get("sum"));

ModelAndView mv=new ModelAndView();
mv.setViewName("user/helloWorld");
return mv;
}

运行结果：



总结：

如果sql中用的是select出结果，不需要配置out参数。多个结果集/结果集可以配置resultMap 来返回LIST，主要是调用selectList方法会自动把结果集加入到list中去的。