mybatis03----配置註解合用案例

第一步：項目配置：

1：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.zit</groupId>
  <artifactId>mybatis03</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>mybatis03</name>

  <dependencies>
    <!-- https://mvnrepository.com/artifact/junit/junit -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.12</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.2</version>
      <scope>provided</scope>
    </dependency>


  </dependencies>

  <build>
    <finalName>${project.artifactId}</finalName>
    <testSourceDirectory>src/test/java</testSourceDirectory>
    <sourceDirectory>src/main/java</sourceDirectory>
    <!-- 解決無法加載資源配置文件 -->
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
          <include>**/*.properties</include>
        </includes>
      </resource>
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*.xml</include>
          <include>**/*.properties</include>
        </includes>
      </resource>
    </resources>
  </build>
</project>

2:src/main/resources建立兩個文件：

conf.xml文件：

<?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>
    <!-- 加載db.properties -->
    <properties resource="db.properties"/>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${db.driver}"/>
                <property name="url" value="${db.url}"/>
                <property name="username" value="${db.username}"/>
                <property name="password" value="${db.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!-- 加載映射配置文件 -->
        <!--   <mapper resource="com/zit/mapper/BookMapper.xml"/>-->
        <!--使用接口-->
        <!--<mapper class="com.zit.mapper.BookMapper"/>-->
        <!--使用包-->
        <package name="com.zit.mapper"/>
    </mappers>
</configuration>

db.properties文件：

db.driver=com.mysql.cj.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/dt_game?serverTimezone=PRC&useSSL=false&uerUnicode=true&characterEncoding=utf-8
db.user=root
db.password=

3.src/main/java/com.zit包下建立兩個包：

src/main/java/com.zit/entity(或者model)/Book.java

package com.zit.entity;

import lombok.Data;

import java.math.BigDecimal;
import java.util.Date;

@Data
public class Book {
    private int id;
    private String name;
    private BigDecimal price;
    private Date btime;
}

src/main/java/com.zit/mapper/BookMapper(interface接口類型)

package com.zit.mapper;

import com.zit.entity.Book;
import org.apache.ibatis.annotations.Delete;

import java.util.List;

public interface BookMapper {
    public List<Book> query();

    @Delete("delete from book where id=#{id}")
    public int delById(int id);


}

src/main/java/com.zit/mapper/BookMapper.xml該配置文件和接口一起存在。

其中BookMapper.xml文件內容如下：（用的時候把mapper裏面的內容刪了再寫）

<?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="book">
    <insert id="add">
        insert into book values(null,#{name},#{price},#{btime})
    </insert>
 
    <select id="queryall" resultType="com.zit.model.Book">
        select * from book
    </select>
 
   <select id="queryById" parameterType="int" resultType="com.zit.model.Book">
        select * from book where id=#{id}
    </select>
 
    <delete id="del">
        delete from book where id=#{id}
    </delete>
 
    <update id="update">
        update book set name=#{name},price=#{price},btime=#{btime} where id=#{id}
    </update>
 
</mapper>

最後：src/test/java/Demo.java

import com.zit.entity.Book;
import com.zit.entity.Student;
import com.zit.mapper.BookMapper;
import com.zit.mapper.StudentMapper;
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.Test;

import java.io.IOException;
import java.io.Reader;
import java.math.BigDecimal;
import java.util.Date;
import java.util.List;

public class Demo {
    @Test
    public void ttt() {
        try {
            Reader reader = Resources.getResourceAsReader("conf.xml");
            SqlSessionFactory sf = new SqlSessionFactoryBuilder().build(reader);
            SqlSession session = sf.openSession();
            BookMapper dao=session.getMapper(BookMapper.class);
            /*dao.delById(7);*/
      /*      System.out.println(dao.query());
            //不推薦這樣使用
            System.out.println(session.selectList("com.zit.mapper.BookMapper.query"));*/
            session.commit();

           StudentMapper sdao= session.getMapper(StudentMapper.class);
            System.out.println(sdao.query());


        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

結束。。。。。