Mybatis中使用注解实现CRUD

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.qublog</groupId>
    <artifactId>mybatis04_annotation</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
        </dependency>
    </dependencies>

</project>

SqlMapConfig.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>
    <!-- 引入外部配置文件 -->
    <properties resource="jdbcConfig.properties"></properties>
    <!-- 配置别名 -->
    <typeAliases>
        <package name="com.qublog.domain"></package>
    </typeAliases>
    <!-- 配置环境 -->
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <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>
    <!-- 指定带有注解的dao接口所在位置 -->
    <mappers>
        <package name="com.qublog.dao"></package>
    </mappers>
</configuration>

jdbcConfig.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test_mybatis?serverTimezone=UTC
jdbc.username=root
jdbc.password=1234

log4j.properties

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

User.java

package com.qublog.domain;

import java.io.Serializable;
import java.util.Date;

public class User implements Serializable {
    private Integer id;
    private String username;
    private String address;
    private String sex;
    private Date birthday;

    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 getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

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

UserDao.java

package com.qublog.dao;

import com.qublog.domain.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.junit.Test;

import java.util.List;

//在mybatis中针对crud一共有四个注解
//@Select @Insert @Update @Delete
public interface UserDao {
    //查询所有用户
    @Select(value = "select * from user;")
    List<User> findAll();

    //保存用户
    @Insert(value = "insert into user(username,address,sex,birthday) values(#{username},#{address},#{sex},#{birthday});")
    void saveUser(User user);

    //更新用户
    @Update(value = "update user set username=#{username},sex=#{sex},birthday=#{birthday},address=#{address} where id=#{id};")
    void updateUser(User user);

    //删除用户
    @Delete(value = "delete from user where id=#{id};")
    void deleteUser(Integer id);

    //根据id查询用户
    @Select(value = "select * from user where id=#{id};")
    User findById(Integer id);

    //根据用户名称模糊查询
    //@Select(value = "select * from user where username like #{username};")
    @Select(value = "select * from user where username like '%${value}%'")
    List<User> findUserByName(String username);

    @Select(value = "select count(*) from user;")
    int findTotalUser();
}

AnnotationCRUDTest.java

import com.qublog.dao.UserDao;
import com.qublog.domain.User;
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.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.List;

public class AnnotationCRUDTest {
    private InputStream in;
    private SqlSessionFactory factory;
    private SqlSession sqlSession;
    UserDao userDao;

    @Before
    public void init() throws Exception {
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        factory = new SqlSessionFactoryBuilder().build(in);
        sqlSession = factory.openSession();
        userDao = sqlSession.getMapper(UserDao.class);
    }

    @After
    public void destroy() throws Exception {
        sqlSession.commit();
        sqlSession.close();
        in.close();
    }

    @Test
    public void testSave() {
        User user = new User();
        user.setUsername("tfw");
        user.setAddress("shenyang");
        user.setSex("男");

        userDao.saveUser(user);
    }

    @Test
    public void testUpdate() {
        User user = new User();
        user.setId(41);
        user.setUsername("niuzhi");

        userDao.updateUser(user);
    }

    @Test
    public void  testDelete() {
        userDao.deleteUser(54);
    }

    @Test
    public void testFindOne() {
        User user = userDao.findById(42);
        System.out.println(user);
    }

    @Test
    public void testFindByName() {
        //List<User> users = userDao.findUserByName("%王%");
        List<User> users = userDao.findUserByName("王");
        for (User user:users) {
            System.out.println(user);
        }
    }

    @Test
    public void testFindTotal() {
        System.out.println(userDao.findTotalUser());
    }
}