Mybatis注解实现数据库增删查改

Mybatis注解实现数据库增删查改

User

package com.itheima.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 +
                '}';
    }
}

IUserDao

package com.itheima.dao;

import com.itheima.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 java.util.List;

/**
 * 在mybatis中针对crud有四个注解
 * @select @delete @insert @update
 */
public interface IUserDao {


  @Select("select * from user")
    List<User> findAll();
  @Insert("insert into user (username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday})")
    void saveUser(User user);
  @Update("update user set username=#{username},sex=#{sex},address=#{address},birthday=#{birthday} where id=#{id}")
    void updateUser(User user);
  @Delete("delete from user where id=#{id}")
    void deleteUser(Integer userId);
    @Select("select * from user where id=#{id}")
    User findById(Integer userId);
    @Select("select * from user where username like #{username}")
    List<User> findUserByName(String username);
    @Select("select count(*) from user")
    int findTotalUser();
}

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.itheima.dao"></package>
   </typeAliases>
    <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.itheima.dao"></package>

    </mappers>

</configuration>

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

jdbcConfig.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatisdb?serverTimezone=UTC
jdbc.username=root
jdbc.password=123456

AnnotationCRUDTest

package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.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.Date;
import java.util.List;

public class AnnotationCRUDTest {
    private InputStream in;
    private SqlSessionFactory factory;
    private SqlSession session;
    private IUserDao userDao;
    @Before
    public  void  init() throws Exception{
        in= Resources.getResourceAsStream("SqlMapConfig.xml");
        factory =new SqlSessionFactoryBuilder().build(in);
        session=factory.openSession();
        userDao=session.getMapper(IUserDao.class);

    }
    @After
    public void destroy() throws Exception{
        session.commit();
        session.close();
        in.close();
    }
    @Test
    public void testsave(){
        User user=new User();
        user.setUsername("mybatis annotation");
        user.setAddress("北京市昌平区");
        userDao.saveUser(user);
    }
    @Test
    public void testupdate(){
        User user=new User();
        user.setId(55);
        user.setUsername("mybatis annotation");
        user.setAddress("北京市海淀区");
        user.setSex("男");
        user.setBirthday(new Date());
        userDao.updateUser(user);
    }
    @Test
    public void testdelete(){

        userDao.deleteUser(56);
    }
    @Test
    public void testFindOne(){
        User user=userDao.findById(51);
        System.out.println(user);
    }
    @Test
    public void testFindByName(){
        List<User> users=userDao.findUserByName("%王%");
        for (User user:users){
            System.out.println(user);
        }


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

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.itheima</groupId>
    <artifactId>day04_03annotation_mybatis</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.4</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>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>

        </dependency>
    </dependencies>


</project>