spring基础mybatis动态SQL

新建maven项目

 导入依赖

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.2</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version> 1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.3</version>
        </dependency>
    </dependencies>

pom开启过滤

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

User.java

package com.shrimpking.pojo;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/12 12:15
 */
public class User
{
    private Integer id;
    private String username;
    private String jobs;
    private String phone;

    public User()
    {
    }

    public User(String username, String jobs, String phone)
    {
        this.username = username;
        this.jobs = jobs;
        this.phone = phone;
    }

    public Integer getId()
    {
        return id;
    }

    public void setId(Integer id)
    {
        this.id = id;
    }

    public String getUsername()
    {
        return username;
    }

    public void setUsername(String username)
    {
        this.username = username;
    }

    public String getJobs()
    {
        return jobs;
    }

    public void setJobs(String jobs)
    {
        this.jobs = jobs;
    }

    public String getPhone()
    {
        return phone;
    }

    public void setPhone(String phone)
    {
        this.phone = phone;
    }

    @Override
    public String toString()
    {
        return "User{" + "id=" + id + ", username='" + username + '\'' + ", jobs='" + jobs + '\'' + ", phone='" + phone + '\'' + '}';
    }
}

UserMapper.java

package com.shrimpking.mapper;

import com.shrimpking.pojo.User;

import java.util.List;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/12 10:18
 */
public interface UserMapper
{
    //根据用户名和岗位查询 if标签
    List<User> findUserByNameAndJobs(User user);

    //根据用户名或者岗位查询 choose标签
    List<User> findUserByNameOrJobs(User user);

    //根据电话查询 where标签
    List<User> findUserByPhone(User user);

    //更新 set标签
    int updateUser(User user);

    //根据用户编号批量查询 foreach标签
    List<User> findUserByIds(List<Integer> ids);

    //根据用户名查询 bind标签
    List<User> findUserByName2(String name);
}

UserMapper.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.shrimpking.mapper.UserMapper">

    <!-- 根据用户名和岗位查询 if标签   -->
    <select id="findUserByNameAndJobs" parameterType="com.shrimpking.pojo.User"
            resultType="com.shrimpking.pojo.User">
        select id,username,jobs,phone from a_user
        where 1=1
        <if test="username != null and username !=''">
            and username like concat('%',#{username},'%')
        </if>
        <if test="jobs != null and jobs != ''">
            and jobs = #{jobs}
        </if>
    </select>

    <!--  根据用户名或者岗位查询 choose标签   -->
    <select id="findUserByNameOrJobs" parameterType="com.shrimpking.pojo.User"
            resultType="com.shrimpking.pojo.User">
        select id,username,jobs,phone from a_user
        where 1=1
        <choose>
            <when test="username != null and username != ''">
                and username like concat('%',#{username},'%')
            </when>
            <when test="jobs != null and jobs != ''">
                and jobs = #{jobs}
            </when>
        </choose>
    </select>

    <!-- 根据电话查询 where标签   -->
    <select id="findUserByPhone" parameterType="com.shrimpking.pojo.User"
            resultType="com.shrimpking.pojo.User">
        select id,username,jobs,phone from a_user
        <where>
            <if test="phone != null and phone !=''">
                and phone like concat('%',#{phone},'%')
            </if>
        </where>
    </select>

    <!-- 更新 set标签   -->
    <update id="updateUser" parameterType="com.shrimpking.pojo.User">
        update a_user
        <set>
            <if test="username != null and username != ''">
                username = #{username},
            </if>
            <if test="jobs != null and jobs != ''">
                jobs = #{jobs},
            </if>
            <if test="phone != null and phone != ''">
                phone = #{phone},
            </if>
        </set>
        where id = #{id}
    </update>

    <!-- 根据用户编号批量查询 foreach标签  -->
    <select id="findUserByIds" parameterType="list"
            resultType="com.shrimpking.pojo.User">
        select id,username,jobs,phone from a_user
        <where>
            id in
            <foreach collection="list" item="id" index="index"
                     open="(" separator="," close=")">
                #{id}
            </foreach>
        </where>
    </select>

    <!-- 根据用户名查询 bind标签   -->
    <select id="findUserByName2" parameterType="com.shrimpking.pojo.User"
            resultType="com.shrimpking.pojo.User">
        <bind name="p1" value="'%' + username + '%'"/>
        select id,username,jobs,phone from a_user
        where username like #{p1}
    </select>

</mapper>

MybatisUtil.java

package com.shrimpking.utils;

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 java.io.IOException;
import java.io.InputStream;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/12 10:15
 */
public class MybatisUtil
{
    private static SqlSessionFactory sqlSessionFactory;

    static {
        try
        {
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    public static SqlSession getSqlSession()
    {
        return sqlSessionFactory.openSession();
    }
}

db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimeZone=UTC
jdbc.username=root
jdbc.password=mysql123

log4j.properties

log4j.rootLogger=ERROR,stdout
log4j.logger.com.shrimpking=DEBUG
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

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="db.properties"/>

    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="com/shrimpking/mapper/UserMapper.xml"/>
    </mappers>
</configuration>

MyTest.java

import com.shrimpking.pojo.User;
import com.shrimpking.utils.MybatisUtil;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2023/7/12 12:22
 */
public class MyTest
{
    @Test
    public void test()
    {
        //根据用户名和岗位查询 if标签
        SqlSession sqlSession = MybatisUtil.getSqlSession();
        User user = new User();
        user.setUsername("zh");
        user.setJobs("teacher");
        List<Object> users = sqlSession.selectList("com.shrimpking.mapper.UserMapper.findUserByNameAndJobs", user);
        for (Object u : users)
        {
            System.out.println(u);
        }
        sqlSession.close();
    }

    @Test
    public void test2()
    {
        //根据用户名或者岗位查询 choose标签
        SqlSession sqlSession = MybatisUtil.getSqlSession();
        User user = new User();
        //user.setUsername("zh");
        user.setJobs("worker");
        List<Object> users = sqlSession.selectList("com.shrimpking.mapper.UserMapper.findUserByNameOrJobs", user);
        for (Object u : users)
        {
            System.out.println(u);
        }
        sqlSession.close();
    }

    @Test
    public void test3()
    {
        //根据电话查询 where标签
        SqlSession sqlSession = MybatisUtil.getSqlSession();
        User user = new User();
        user.setPhone("13");
        List<Object> users = sqlSession.selectList("com.shrimpking.mapper.UserMapper.findUserByPhone", user);
        for (Object u : users)
        {
            System.out.println(u);
        }
        sqlSession.close();
    }

    @Test
    public void test4()
    {
        //更新 set标签
        SqlSession sqlSession = MybatisUtil.getSqlSession();
        User user = new User();
        user.setId(1);
        user.setUsername("zhou");
        user.setPhone("888");
        int rows = sqlSession.update("com.shrimpking.mapper.UserMapper.updateUser", user);
        if(rows > 0)
        {
            System.out.println("成功更新了" + rows + "条数据");
        }
        else
        {
            System.out.println("更新失败");
        }
        sqlSession.commit();
        sqlSession.close();
    }

    @Test
    public void test5()
    {
        //根据用户编号批量查询 foreach标签
        SqlSession sqlSession = MybatisUtil.getSqlSession();
        List<Integer> ids = new ArrayList<Integer>();
        ids.add(1);
        ids.add(3);
        List<User> users = sqlSession.selectList("com.shrimpking.mapper.UserMapper.findUserByIds", ids);
        for (Object user : users)
        {
            System.out.println(user);
        }
        sqlSession.close();
    }

    @Test
    public void test6()
    {
        //根据用户名查询 bind标签
        SqlSession sqlSession = MybatisUtil.getSqlSession();
        User user = new User();
        user.setUsername("wa");
        List<User> users = sqlSession.selectList("com.shrimpking.mapper.UserMapper.findUserByName2", user);
        for (User u : users)
        {
            System.out.println(u);
        }
        sqlSession.close();
    }
}

数据库

drop table if EXISTS a_user;
create table a_user(
	id int(32) auto_increment primary key,
	username varchar(50),
	jobs varchar(50),
	phone varchar(16)
);

insert into a_user values(1,'zhang','teacher','133');
insert into a_user values(2,'li','worker','188');
insert into a_user values(3,'wang','doctor','139');