Mybatis之数据操作(增删改查+批量操作)
项目资源包可以去我的资源里下载
创建表
（1）创建表
-- 学生表
create table student(
id int PRIMARY KEY auto_increment,
name varchar(20) not null,
age int not null);
-- 向学生表中增加记录
INSERT INTO student values(null,"李华",22);
INSERT INTO student values(null,"王华",21);
INSERT INTO student values(null,"张华",20);
创建持久化类
package cn.sdut.po;
public class Student {
int id;
String name;
int age;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}
表映射文件：StudentMapper.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="aaa">
<resultMap type="cn.sdut.po.Student" id="stuMap">
<id column="id" property="id"/>
<result column="name" property="name"/>
<result column="age" property="age"/>
resultMap>
<select id="getByCond" resultType="cn.sdut.po.Student">
select * from student
<trim prefix="where" prefixOverrides="and">
<if test="id!=0">
and id>#{id}
if>
<if test="name!=null and name!=''">
and name like concat('%',#{name},'%')
if>
<if test="age!=0">
and age>=#{age}
if>
trim>
select>
<select id="getInRange" resultMap="stuMap">
select * from student where id in
<foreach collection="list" item="id"
open="(" close=")" separator=","
index="index"
>
#{id}
foreach>
select>
<select id="getAll" resultType="cn.sdut.po.Student">
select * from student
select>
<select id="getStudentById" resultType="student">
select * from student
where id=#{id111111}
select>
<insert id="addStudent">
insert into student values(null,#{name},#{age})
insert>
<delete id="delStudent">
delete from student where id=#{id}
delete>
<update id="updateStudent">
update student set name=#{name},age=#{age} where
id=#{id}
update>
<update id="updateStudentByCond">
update student
<trim prefix="set" suffixOverrides=",">
<if test="name!=null and name!=''">
name=#{name},
if>
<if test="age!=0">
age=#{age},
if>
trim>
where id=#{id}
update>
<insert id="insertBatch">
insert into student (id,name,age) values
<foreach collection="list" item="Student" separator="," index="index">
(null, #{Student.name}, #{Student.age})
foreach>
insert>
mapper>
全局配置文件：mybatis-config.xml
xml version="1.0" encoding="UTF-8" ?>
DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="jdbc.properties">properties>
<typeAliases>
<typeAlias type="cn.sdut.po.Student" alias="student"/>
typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
dataSource>
environment>
environments>
<mappers>
<mapper resource="cn/sdut/mapper/StudentMapper.xml"/>
mappers>
configuration>
Jbdc配置文件：jbdc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/sdut?useUnicode=true&characterEncoding=utf-8
jdbc.user=root
jdbc.password=root
日志配置文件：log4j.properties
### \u8BBE\u7F6E###
log4j.rootLogger = debug,stdout
### \u8F93\u51FA\u4FE1\u606F\u5230\u63A7\u5236\u62AC ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
测试文件：Main.java
package cn.sdut.view;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
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 cn.sdut.po.Student;
public class Main {
public static void main(String[] args) throws IOException {
InputStream reader=Resources.getResourceAsStream("mybatis-config.xml");
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = factory.openSession();
/*Student student=new Student();
student.setId(7);
student.setName("山东1111");
student.setAge(31222);
int r=session.insert("addStudent", student);*/
//int r=session.update("updateStudent",student);
/*int r=session.delete("delStudent",7);
System.out.println(r);
session.commit();
List
System.out.println(stuList);
Student stu=session.selectOne("getStudentById",1);
System.out.println(stu);*/
/*条件查询*/
Student stu1=new Student();
stu1.setName("华");
stu1.setAge(20);
List
System.out.println("条件查询："+stuList2);
/*条件修改*/
Student stu=new Student();
//stu.setName("山东1111");
stu.setAge(26);
stu.setId(4);
session.update("updateStudentByCond",stu);
session.commit();
/*int[] arr= {1,2,3};
List
System.out.println(stuList);*/
/*批量查询*/
List
list.add(1);
list.add(2);
list.add(3);
List
System.out.println("批量查询:"+stuList);
/*批量插入*/
Student insert1=new Student();
insert1.setId(7);
insert1.setAge(20);
insert1.setName("李四");
Student insert2=new Student();
insert2.setId(8);
insert2.setAge(22);
insert2.setName("張三");
List
insertlist.add(insert1);
insertlist.add(insert2);
int r1=session.insert("insertBatch", insertlist);
session.commit();
System.out.println("批量插入:"+r1);
}
}