01-mybatis配置

安装

要使用 MyBatis，只需将jar文件置于类路径（classpath）中即可。

如果使用 Maven 来构建项目，则需将下面的依赖代码置于 pom.xml 文件中：

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.6</version>
</dependency>

下面是pom.xml的全部配置，除了Mybatis 以外还有MySQL的依赖等...

<?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">
    <parent>
        <artifactId>Mybatis</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>tset03</artifactId>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.testng</groupId>
            <artifactId>testng</artifactId>
            <version>6.14.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>


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

    </build>
</project>

配置mybatis-config.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>

    <properties resource="db.properties"/>

    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>

    <typeAliases>
        <typeAlias type="com.test.pojo.User" alias="User"/>
        <package name="com.test.pojo"/>

    </typeAliases>


    <environments default="test">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&amp;characterEncoding=utf8&amp;serverTimezone=GMT%2B8&amp;useSSL=false"/>
                <property name="username" value="root"/>
                <property name="password" value="1234"/>
            </dataSource>
        </environment>



        <environment id="test">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
            <property name="driver" value="${driver}"/>
            <property name="url" value="${url}"/>
            <property name="username" value="${username}"/>
            <property name="password" value="${password}"/>
              </dataSource>
        </environment>

    </environments>
    <mappers>
        <mapper resource="com/test/dao/UserMapper.xml"/>
    </mappers>
</configuration>

从db.properties文件中导入访问数据库的信息，对应environments第二种配置。

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
username=root
password=1234

log4j的配置

log4j.rootLogger=DEBUG,console,file


log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n


log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/kuang.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n


log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

    <typeAliases>
        <typeAlias type="com.test.pojo.User" alias="User"/>
        <package name="com.test.pojo"/>

    </typeAliases>
起别名

    <mappers>
        <mapper resource="com/test/dao/UserMapper.xml"/>
    </mappers>
添加Mapper文件

配置工具类

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;

public class MyBatisUtils {

    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(){
        SqlSession sqlSession = sqlSessionFactory.openSession();
        return sqlSession;

    }
}

通过SqlSessionFactory 获得一个SqlSession，MyBatisUtils.java通常放在utils包下。

编写pojo下的属性对象

public class User {
    private int id;
    private String username;
    private String password;

    public User() {
    }

    public User(int id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public int getId() {
        return id;
    }

    public void setId(int 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;
    }

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

编写dao层接口

import com.test.pojo.User;

import java.util.List;
import java.util.Map;

public interface UserMapper {
    List<User> getUserList();
    //查询一个用户
    User getUserById(int id);

    List<User> getUserByLimit(Map<String,Integer> map);

    //insert一个用户
    int addUser(User user);

    int addUser2(Map<String, Object> map);
    //  update一个数据
    int upDateUser(User user);
    //删除一个用户
    int deleteUser(int id);

    List<User> getUserLike(String value);


}

编写对应的mapper文件

<?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.test.dao.UserMapper">

<resultMap id="UserMap" type="User">
    <result column="id" property="id"/>
    <result column="name" property="username"/>
    <result column="pwd" property="password"/>
</resultMap>

    <select id="getUserList" resultType="User">
    select * from mybatis.user;
  </select>
    
    
    <select id="getUserByLimit" parameterType="map" resultMap="UserMap">
        select * from mybatis.user limit #{startIndex},#{pageSize}
    </select>

    <select id="getUserLike" resultType="User">
    select *from mybatis.user where name like #{value}

    </select>
    <select id="getUserById"  resultMap="UserMap">
    select * from mybatis.user where id=#{id};
  </select>

</mapper>

编写测试类

import com.test.pojo.User;
import com.test.utils.MyBatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.HashMap;
import java.util.List;
import java.util.logging.Logger;

public class UserMapperTest {

//增删改查需要提交事务
    //错误信息从下往上读

    @Test
    public void getUserByLimit(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();
        UserMapper getMapper = sqlSession.getMapper(UserMapper.class);

        HashMap<String, Integer> map = new HashMap<String, Integer>();
        map.put("startIndex",0);
        map.put("pageSize",2);

        List<User> userByLimit = getMapper.getUserByLimit(map);

        for (User user : userByLimit) {
            System.out.println(user);
        }
        sqlSession.close();


    }

    @Test
    public void getUserById(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.getUserById(2);
        System.out.println(user);
    }
    @Test
    public  void Test01(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();
        try {
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            List<User> userList = userMapper.getUserList();
            for (User user:userList) {

                System.out.println(user);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            sqlSession.close();
        }


    }

    @Test
    public  void Test02(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        User user = mapper.getUserById(2);
        System.out.println(user);
        sqlSession.close();

    }
    @Test
    public void addUser(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        int res = mapper.addUser(new User(4, "zhangsan", "1210"));

        if(res>0){
            System.out.println("插入成功");
        }
        sqlSession.commit();

        sqlSession.close();

    }

    @Test
    public void addUser2(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        HashMap<String, Object> map = new HashMap<String,Object>();
        map.put("UserId",5);
        map.put("UserName","c++");
        map.put("UserPassWord","1210");

        int res = mapper.addUser2(map);

        if(res>0){
            System.out.println("插入成功");
        }
        sqlSession.commit();

        sqlSession.close();

    }

    @Test
    public void Update(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        int res = mapper.upDateUser(new User(4, "lisi", "1210"));

        if (res>0){
            System.out.println("修改成功");
        }

        sqlSession.commit();

        sqlSession.close();

    }

    @Test
    public void deleteUser() {
        SqlSession sqlSession = MyBatisUtils.getSqlSession();

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        int res = mapper.deleteUser(4);

        if (res>0){
            System.out.println("删除成功");
        }

        sqlSession.commit();

        sqlSession.close();


    }

    @Test
    public void getUserLike(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        List<User> userList = mapper.getUserLike("%张%");

        for (User user:
             userList) {
            System.out.println(user);
        }

        sqlSession.close();
    }
}

posted @ 2021-06-20 20:01 CooperMiNi 阅读(52) 评论(0) 收藏举报

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CooperMiNi

01-mybatis配置

安装

配置mybatis-config.xml文件

配置工具类

编写pojo下的属性对象

编写dao层接口

编写对应的mapper文件

编写测试类

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