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<parameterMap>
• statementType：指定Statement的真是类型：CALLABLE执行调用存储过程的语句
• <parameterMap>：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
• <parameter>：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";
        Map<String,Integer> parmeterMap=new HashMap<String,Integer>();
        parmeterMap.put("sexid", 0);
        parmeterMap.put("usercount", -1);
        session.selectOne(statement, parmeterMap);
        Integer result=parmeterMap.get("usercount");
        System.out.println(result);
        session.close();
    }
}