Mybatis的环境搭建实现增删除改查和批量的增加，和多个id同时查询
相关的结构
pom.xml文件：
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>TeacherSpringCompnentScanartifactId>
<groupId>com.zjjgroupId>
<version>1.0-SNAPSHOTversion>
parent>
<modelVersion>4.0.0modelVersion>
<artifactId>TeacherMybatisartifactId>
<dependencies>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.45version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.4.5version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.13.2version>
<scope>testscope>
dependency>
<dependency>
<groupId>org.apache.logging.log4jgroupId>
<artifactId>log4j-coreartifactId>
<version>2.8.2version>
dependency>
dependencies>
project>
配置相关的日志：
在mybatis-config.xml文件中加上：
<!-- 日志的相关的信息的配置-->
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>
在ReSource目录中创建log4j.properties文件加上如下的内容：
log4j.rootLogger=debug,stdout,logfile
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.SimpleLayout
log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.Java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
UserMapper.xml文件：
<mapper namespace="com.zjj.dao.UserDao">
<resultMap id="userResultMap" type="User">
<id property="id" column="id"/>
<result property="username" column="username"/>
<result property="password" column="password"/>
<result property="isadmin" column="isadmin"/>
resultMap>
<select id="queryById" resultMap="userResultMap">
select * from tb_user where id=#{id}
select>
<select id="queryAllUsers" resultType="User">
select *from tb_user
select>
<select id="queryUsersBymouhu" parameterType="string" resultMap="userResultMap">
select *from tb_user where username like "%${mohu}%"
select>
<select id="queryUsersBymouhu2" parameterType="string" resultMap="userResultMap">
select *from tb_user where username like "%${mo}%" or password like "%${mo}%"
select>
<insert id="addUser" parameterType="User" >
INSERT INTO tb_user ( username, password, isadmin) VALUES ( #{username},#{password} ,#{isadmin} )
insert>
<insert id="addUser2" parameterType="User" keyProperty="id" useGeneratedKeys="true">
insert into tb_user(username,password,isadmin) values(#{username},#{password},#{isadmin})
insert>
<update id="updateUser" parameterType="User">
UPDATE `tb_user` SET `username` = #{username}, `password` = #{password}, `isadmin` = #{isadmin} WHERE `id` = #{id};
update>
<delete id="deleteById" parameterType="long">
delete from tb_user where id=#{id}
delete>
<select id="queryStudentsByUsernameAndAdmin" parameterType="User" resultMap="userResultMap">
select *from tb_user where username=#{username} and isadmin=#{isadmin}
select>
<select id="queryUserByids" parameterType="List" resultMap="userResultMap">
select *from tb_user where id in
-- 注意这里的list一定要小写
<foreach collection="list" item="id" index="i" open="(" separator="," close=")">
#{id}
foreach>
select>
<insert id="insertBatch" parameterType="List">
INSERT INTO tb_user ( username, password, isadmin) VALUES
<foreach collection="list" item="item" index="index" separator=",">
(#{item.username}, #{item.password}, #{item.isadmin})
foreach>
insert>
mapper>
User文件：
package com.zjj.pojo;
public class User {
// 建议属性名和字段名保持一致，这个可以不用resultMap
private Long id;
private String username;
private String password;
private Integer isadmin;
public User() {
}
public User(String username, String password, Integer isadmin) {
this.username = username;
this.password = password;
this.isadmin = isadmin;
}
public User(Long id, String username, String password, Integer isadmin) {
this.id = id;
this.username = username;
this.password = password;
this.isadmin = isadmin;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getIsadmin() {
return isadmin;
}
public void setIsadmin(Integer isadmin) {
this.isadmin = isadmin;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", isadmin=" + isadmin +
'}';
}
}
UserDao文件：
package com.zjj.dao;
import com.zjj.pojo.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface UserDao{
//测试一下看看是否有连接的错误
public User queryById(Long id);
// 查询所有的User
public List<User> queryAllUsers();
// 通过id删除数据
public void deleteById(Long id);
// 添加一个User
public void addUser(User user);
// 添加并返回添加后的自增主键
public void addUser2(User user);
// 更新
public void updateUser(User user);
// 模糊查询
public List<User> queryUsersBymouhu(@Param("mohu") String mohu);
// 多个模糊查询
public List<User> queryUsersBymouhu2(@Param("mo") String mo);
// 查询直接查询
public List<User> queryUserByUsernameAndisadmin(User user);
// 根据id的集合查询所有
public List<User> queryUserByids(List<Long> ids);
// 批量添加
public void insertBatch(List<User> users);
}