七、Mybatis调用存储过程

7.1准备数据库表和存储过程
create table p_user(
id int primary key auto_increment,
name varchar(10),
sex char(2)
);
insert into p_user(name,sex) values('A',"男");
insert into p_user(name,sex) values('B',"女");
insert into p_user(name,sex) values('C',"男");
#创建存储过程(查询得到男性或女性的数量, 如果传入的是 0 就女性否则是男性)
DELIMITER $
CREATE PROCEDURE mybatis.ges_user_count(IN sex_id INT, OUT user_count INT)
BEGIN
IF sex_id=0 THEN
SELECT COUNT(*) FROM mybatis.p_user WHERE p_user.sex='女' INTO user_count;
ELSE
SELECT COUNT(*) FROM mybatis.p_user WHERE p_user.sex='男' INTO user_count;
END IF;
END
$
#调用存储过程
DELIMITER ;
SET @user_count = 0;
CALL mybatis.ges_user_count(1, @user_count);
SELECT @user_count;
7.2创建表的实体类

PUser.java

package com.atguigu.mybatis_test.bean;

public class PUser {
    private String id;
    private String name;
    private String sex;
    public PUser() {
        super();
    }
    public PUser(String id, String name, String sex) {
        super();
        this.id = id;
        this.name = name;
        this.sex = sex;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    @Override
    public String toString() {
        return "PUser [id=" + id + ", name=" + name + ", sex=" + sex + "]";
    }
}
7.3创建映射文件

PUserMapper.xml

?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.config.PUserMapper"
    !-- 
    查询得到男性或女性的数量, 如果传入的是 0 就女性否则是男性
    --
    select id="getUserCount" parameterMap="getUserCountMap" statementType="CALLABLE"
        CALL mybatis.ges_user_count(?,?)
    /select

    !-- parmeterMap.put("sexid", 0);
        parmeterMap.put("usercount", -1); --

    parameterMap id="getUserCountMap" type="java.util.Map"
        parameter property="sexid" mode="IN" jdbcType="INTEGER"/
        parameter property="usercount" mode="OUT" jdbcType="INTEGER"/
    /parameterMap
/mapper
  • parameterMap:引用
  • statementType:指定Statement的真是类型:CALLABLE执行调用存储过程的语句
  • :定义多个参数的键值对
  • type:需要传递的参数的真实类型 java.util.Map
  • :指定一个参数key-value
7.4将映射文件注册到config.xml中

config.xml

mappers
      mapper resource="com/config/PUserMapper.xml"/
/mappers
7.5测试类

Test7.java

package com.test;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import com.util.MybatisUtil;

public class Test7 {

    @Test
    public void testGetUserCount() throws IOException
    {
        SqlSession session=MybatisUtil.getSession();
        String statement="com.config.PUserMapper.getUserCount";
        MapString,Integer parmeterMap=new HashMapString,Integer();
        parmeterMap.put("sexid", 0);
        parmeterMap.put("usercount", -1);
        session.selectOne(statement, parmeterMap);
        Integer result=parmeterMap.get("usercount");
        System.out.println(result);
        session.close();
    }
}
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