mybatis动态sql之使用foreach进行批量插入的两种方式
时间:2022-07-23
本文章向大家介绍mybatis动态sql之使用foreach进行批量插入的两种方式,主要内容包括其使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。
EmployeeMapperDynamicSql.java
package com.gong.mybatis.mapper;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.MapKey;
import org.apache.ibatis.annotations.Param;
import com.gong.mybatis.bean.Employee;
public interface EmployeeMapperDynamicSql {
public List<Employee> getEmpByConditionIf(Employee employee);
public 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>
<when test="lastName!=null">
last_name like #{lastName}
</when>
<when test="email!=null">
email=#{email}
</when>
<otherwise>
</otherwise>
</choose>
</where>
</select>
<insert id="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})
</foreach>
</insert>
</mapper>
第一种方式如上所示:insert into tbl_employee(last_name,gender,email,d_id) values (?,?,?,?) , (?,?,?,?)
进行测试:
package com.gong.mybatis.test;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import com.gong.mybatis.bean.Department;
import com.gong.mybatis.bean.Employee;
import com.gong.mybatis.mapper.EmployeeMapperDynamicSql;
public class TestMybatis3 {
public SqlSessionFactory getSqlSessionFactory() throws IOException {
String resource = "mybatis-config.xml";
InputStream is = Resources.getResourceAsStream(resource);
return new SqlSessionFactoryBuilder().build(is);
}
@Test
public void test() throws IOException {
SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
SqlSession openSession = sqlSessionFactory.openSession();
try {
EmployeeMapperDynamicSql mapper = openSession.getMapper(EmployeeMapperDynamicSql.class);
List<Employee> emps = new ArrayList<>();
Department d1 = new Department(1);
Employee e1 = new Employee(null,"manwang","1","manwang@qq.com",d1);
Department d2 = new Department(2);
Employee e2 = new Employee(null,"timo","0","timo@qq.com",d2);
emps.add(e1);
emps.add(e2);
mapper.addEmp(emps);
List<Employee> es = mapper.getEmpByConditionIf(new 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,gender,email,d_id) values (?,?,?,?) , (?,?,?,?) (BaseJdbcLogger.java:145)
DEBUG 01-21 21:16:38,261 ==> Parameters: manwang(String), 1(String), manwang@qq.com(String), 1(Integer), timo(String), 0(String), timo@qq.com(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, gender=1, email=dema@qq.com, dept=null]
Employee [id=2, lastName=jack, gender=1, email=675544321@qq.com, dept=null]
Employee [id=3, lastName=小红, gender=0, email=xiaohong@qq.com, dept=null]
Employee [id=4, lastName=小明, gender=0, email=xiaoming@qq.com, dept=null]
Employee [id=5, lastName=manwang, gender=1, email=manwang@qq.com, dept=null]
Employee [id=6, lastName=timo, gender=0, email=timo@qq.com, dept=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 id="addEmp">
<foreach collection="emps" item="emp" separator=";">
insert into tbl_employee(last_name,gender,email,d_id)
values
(#{emp.lastName},#{emp.gender},#{emp.email},#{emp.dept.id})
</foreach>
</insert>
这种方式的sql形如:insert into tbl_employee(last_name,gender,email,d_id) values (?,?,?,?) ; insert into tbl_employee(last_name,gender,email,d_id) values (?,?,?,?)
结果:
DEBUG 01-21 21:34:32,747 ==> Preparing: insert into tbl_employee(last_name,gender,email,d_id) values (?,?,?,?) ; insert into tbl_employee(last_name,gender,email,d_id) values (?,?,?,?) (BaseJdbcLogger.java:145)
DEBUG 01-21 21:34:32,823 ==> Parameters: manwang(String), 1(String), manwang@qq.com(String), 1(Integer), timo(String), 0(String), timo@qq.com(String), 2(Integer) (BaseJdbcLogger.java:145)
DEBUG 01-21 21:34:32,889 <== Updates: 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=1, lastName=dema, gender=1, email=dema@qq.com, dept=null]
Employee [id=2, lastName=jack, gender=1, email=675544321@qq.com, dept=null]
Employee [id=3, lastName=小红, gender=0, email=xiaohong@qq.com, dept=null]
Employee [id=4, lastName=小明, gender=0, email=xiaoming@qq.com, dept=null]
Employee [id=5, lastName=manwang, gender=1, email=manwang@qq.com, dept=null]
Employee [id=6, lastName=timo, gender=0, email=timo@qq.com, dept=null]
Employee [id=7, lastName=manwang, gender=1, email=manwang@qq.com, dept=null]
Employee [id=8, lastName=timo, gender=0, email=timo@qq.com, dept=null]
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