mybatis动态sql之使用foreach进行批量插入的两种方式

EmployeeMapperDynamicSql.java

package com.gong.mybatis.mapper;

import java.util.List;
 java.util.Map;

 org.apache.ibatis.annotations.MapKey;
 org.apache.ibatis.annotations.Param;

 com.gong.mybatis.bean.Employee;

public interface EmployeeMapperDynamicSql {
    public List<Employee> getEmpByConditionIf(Employee employee);
    
    void addEmp(@Param("emps") List<Employee> employee);
}

EmployeeMapperDynamicSql.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.gong.mybatis.mapper.EmployeeMapperDynamicSql">
    <!-- 查询，要查那个就带上那个条件 -->
    select id="getEmpByConditionIf" resultType="com.gong.mybatis.bean.Employee">
        select * from tbl_employee 
        where>
            choose>
                when test="id!=null"
                    id=#{id}
                </when="lastName!=null"
                    last_name like #{lastName}
                ="email!=null"
                    email=#{email}
                otherwise>
        select>
    
    insert ="addEmp"
        insert into tbl_employee(last_name,gender,email,d_id)
        values
        foreach collection="emps" item="emp" separator=","
            (#{emp.lastName},#{emp.gender},#{emp.email},#{emp.dept.id})
        foreachinsert>
mapper>

第一种方式如上所示：insert into tbl_employee(last_name,d_id) values (?,?,?),(?,?)

进行测试：

 com.gong.mybatis.test;

 java.io.IOException;
 java.io.InputStream;
 java.util.ArrayList;
 java.util.Arrays;
 java.util.HashMap;
 org.apache.ibatis.io.Resources;
 org.apache.ibatis.session.SqlSession;
 org.apache.ibatis.session.SqlSessionFactory;
 org.apache.ibatis.session.SqlSessionFactoryBuilder;
 org.junit.Test;

 com.gong.mybatis.bean.Department;
 com.gong.mybatis.bean.Employee;
 com.gong.mybatis.mapper.EmployeeMapperDynamicSql;

class TestMybatis3 {
    
    public SqlSessionFactory getSqlSessionFactory() throws IOException {
        String resource = "mybatis-config.xml";
        InputStream is = Resources.getResourceAsStream(resource);
        return new SqlSessionFactoryBuilder().build(is);
    }

    @Test
    void test()  IOException {
        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
        SqlSession openSession = sqlSessionFactory.openSession();
        try {
            EmployeeMapperDynamicSql mapper = openSession.getMapper(EmployeeMapperDynamicSql.);
            List<Employee> emps = new ArrayList<>();
            Department d1 = new Department(1);
            Employee e1 = new Employee(null,"manwang","1","[e-mail]",d1);
            Department d2 = new Department(2);
            Employee e2 =  Employee());
            for(Employee e:es) {
                System.out.println(e);
            }
            openSession.commit();
        } finally {
            openSession.close();
        }
        
    }
    
}

输出结果：

DEBUG 01-21 21:16:38,183 ==>  Preparing: insert into tbl_employee(last_name,?)   (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:16:38,261 ==> Parameters: manwang(String),1(String),[e-mail](String),1(Integer),timo(String),0(String),[e-mail](String),2(Integer)  (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:16:38,374 ==    Updates: 2  (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:16:38,385 ==>  Preparing: select * from tbl_employee   (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:16:38,386 ==> Parameters:   (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:16:38,430 <==      Total: 6  (BaseJdbcLogger.java:145) 
Employee [id=1,lastName=dema,1)">genderemail=[e-mail],1)">dept=null]
Employee [id=2,1)">=jack,1)">=[e-mail],1)">=3,1)">=小红,1)">=0,1)">=[e-mail],1)">=4,1)">=小明,1)">=[e-mail],1)">=5,1)">=manwang,1)">=[e-mail],1)">=6,1)">=timo,1)">=[e-mail],1)">=null]

第二种方式需要在配置连接数据源时使用：

jdbc.url=jdbc:mysql://localhost:3306/mybatis?allowMultiQueries=true

然后在xml文件中：

    =";"
            insert into tbl_employee(last_name,d_id)
            values
            (#{emp.lastName},1)">> 

这种方式的sql形如：insert into tbl_employee(last_name,?) ; insert into tbl_employee(last_name,?)

结果：

DEBUG 01-21 21:34:32,747 ==>  Preparing: insert into tbl_employee(last_name,?)   (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:34:32,823 ==> Parameters: manwang(String),2(Integer)  (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:34:32,889 1  (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:34:32,900 Preparing: select * from tbl_employee   (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:34:32,902 Parameters:   (BaseJdbcLogger.java:145) 
DEBUG 01-21 21:34:32,966 <Total: 8  (BaseJdbcLogger.java:145) 
Employee [id=7,1)">=8,1)">=null]