010_Mybatis簡介

本文轉載自查看原文 2021-07-11 18:21 167 100_Mybatis

Mybatis簡介
第一個Mybatis程序
- 搭建環境
CRUD
Map的應用

Mybatis簡介

什么是 MyBatis？

MyBatis 是一款優秀的持久層框架，它支持自定義 SQL、存儲過程以及高級映射。MyBatis 免除了幾乎所有的 JDBC 代碼以及設置參數和獲取結果集的工作。MyBatis 可以通過簡單的 XML 或注解來配置和映射原始類型、接口和 Java POJO（Plain Old Java Objects，普通老式 Java 對象）為數據庫中的記錄。

MyBatis 是一款優秀的持久層框架
它支持自定義 SQL、存儲過程以及高級映射。
MyBatis 免除了幾乎所有的 JDBC 代碼以及設置參數和獲取結果集的工作。
MyBatis 可以通過簡單的 XML 或注解來配置和映射原始類型、接口和 Java POJO（Plain Old Java Objects，普通老式 Java 對象）為數據庫中的記錄。
MyBatis 本是apache的一個開源項目iBatis, 2010年這個項目由apache software foundation 遷移到了google code，並且改名為MyBatis 。2013年11月遷移到Github。

如何獲得Mybatis

maven倉庫

<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.7</version>
</dependency>

中文文檔：https://mybatis.org/mybatis-3/zh/index.html
Github：https://github.com/mybatis/mybatis-3/releases

持久化

持久層

為什么需要Mybatis

第一個Mybatis程序

學習新東西方法：搭建環境-》導入mybatis-》編寫代碼-》測試

搭建環境

建庫建表

CREATE DATABASE `mybatis`CHARACTER SET utf8 COLLATE utf8_general_ci; 
USE `mybatis`;
CREATE TABLE `mybatis`.`user` ( `id` INT(20) NOT NULL COMMENT '主鍵', `name` VARCHAR(100) NOT NULL COMMENT '用戶名', `pwd` VARCHAR(100) NOT NULL COMMENT '密碼', PRIMARY KEY (`id`) ) ENGINE=INNODB CHARSET=utf8 COLLATE=utf8_general_ci; 
DESCRIBE `mybatis`.`user`; 
INSERT INTO `mybatis`.`user` (`id`, `name`, `pwd`) VALUES ('1', 'zhangyq', '123456'); 
INSERT INTO `mybatis`.`user` (`id`, `name`, `pwd`) VALUES ('2', 'zhangsf', '123456'); 
INSERT INTO `mybatis`.`user` (`id`, `name`, `pwd`) VALUES ('3', 'zhangdl', '123456');

新建父工程

新建普通maven項目

刪除src目錄，作為父工程

導入maven依賴

<?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>

    <!--父工程-->
    <groupId>com.qing</groupId>
    <artifactId>mybatis-study</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.7</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
        </dependency>

    </dependencies>

</project>

創建第一個子模塊

編寫mybatis的核心配置文件

官網：https://mybatis.org/mybatis-3/zh/index.html

<?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">

<!--核心配置文件-->
<configuration>
    <!--指定默認數據源-->
    <environments default="development">
        <!--數據源-->
        <environment id="development">
            <!--事務管理器-->
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
</configuration>

編寫mybatis工具類，獲取SqlSession

SqlSession 提供了在數據庫執行 SQL 命令所需的所有方法。你可以通過 SqlSession 實例來直接執行已映射的 SQL 語句。

package com.qing.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;

public class MybatisUtils {

    // 構建 SqlSessionFactory 的實例
    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();
        }
    }

    /**
     * 獲取 SqlSession
     * @return
     */
    public static SqlSession getSqlSession() {
        return sqlSessionFactory.openSession();
    }
}

編寫代碼測試

實體類

接口

package com.qing.dao;

import com.qing.pojo.User;

import java.util.List;

/**
 * 接口
 */
public interface UserMapper {

    List<User> getUserList();
}

Mapper

<?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">
<!--命名空間綁定一個對應的接口-->
<mapper namespace="com.qing.dao.UserMapper">
    <!--id對應接口的方法，返回值類型對應接口返回值，參數類型對應接口方法參數，集合類型寫集合泛型類型-->
    <select id="getUserList" resultType="com.qing.pojo.User">
        select * from mybatis.user
    </select>
</mapper>

測試

package com.qing.dao;

import com.qing.pojo.User;
import com.qing.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class UserMapperTest {

    /**
     * 方式一：sqlSession.getMapper(UserMapper.class)
     */
    @Test
    public void test() {
        // 獲取sqlSession
        SqlSession sqlSession = MybatisUtils.getSqlSession();
        // 執行SQL
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> userList = mapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
        // 關閉sqlSession
        sqlSession.close();
    }
}

問題一：Mapper.xml未注冊

org.apache.ibatis.binding.BindingException: Type interface com.qing.dao.UserMapper is not known to the MapperRegistry.

	at org.apache.ibatis.binding.MapperRegistry.getMapper(MapperRegistry.java:47)
	at org.apache.ibatis.session.Configuration.getMapper(Configuration.java:845)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.getMapper(DefaultSqlSession.java:288)
	at com.qing.dao.UserMapperTest.test(UserMapperTest.java:20)

解決：mybatis-config.xml中注冊Mapper，resource綁定Mapper，必須使用路徑/

<?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">

<!--核心配置文件-->
<configuration>
    <!--指定默認數據源-->
    <environments default="development">
        <!--數據源-->
        <environment id="development">
            <!--事務管理器-->
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/qing/dao/UserMapper.xml"/>
    </mappers>
</configuration>

問題二：Mapper文件編譯后不存在

java.lang.ExceptionInInitializerError
	at com.qing.dao.UserMapperTest.test(UserMapperTest.java:18)
Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in com/qing/dao/UserMapper.xml
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource com/qing/dao/UserMapper.xml
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)

解決：pom.xml中配置編譯配置

<?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-study</artifactId>
        <groupId>com.qing</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>mybatis-01</artifactId>

    <!--配置resources，防止資源導出失敗問題-->
    <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>

問題三：數據庫連接SSL錯誤

org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 2,729 milliseconds ago.  The last packet sent successfully to the server was 2,715 milliseconds ago.
### The error may exist in com/qing/dao/UserMapper.xml
### The error may involve com.qing.dao.UserMapper.getUserList
### The error occurred while executing a query
### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

Caused by: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Path does not chain with any of the trust anchors

解決：mybatis-config.xml中useSSL=true改為useSSL=false

<?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">

<!--核心配置文件-->
<configuration>
    <!--指定默認數據源-->
    <environments default="development">
        <!--數據源-->
        <environment id="development">
            <!--事務管理器-->
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="123456"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/qing/dao/UserMapper.xml"/>
    </mappers>
</configuration>

測試成功

CRUD

namespace中的包名要和Mapper接口的包名一致

<?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">
<!--命名空間綁定一個對應的接口-->
<mapper namespace="com.qing.dao.UserMapper">
    <!--id對應接口的方法，返回值類型對應接口返回值，參數類型對應接口方法參數，集合類型寫集合泛型類型-->
    <select id="getUserList" resultType="com.qing.pojo.User">
        select * from mybatis.user
    </select>
</mapper>

package com.qing.dao;

import com.qing.pojo.User;
import java.util.List;

/**
 * 接口
 */
public interface UserMapper {

    /**
     * 查詢全部用戶
     * @return
     */
    List<User> getUserList();
}

select 選擇，查詢語句

id 對應接口中的方法名

parameterType 對應接口中方法的請求參數

resultType 對應接口中方法的返回值

集合類型寫集合泛型類型

<?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">
<!--命名空間綁定一個對應的接口-->
<mapper namespace="com.qing.dao.UserMapper">
    <!--查詢全部用戶-->
    <select id="getUserList" resultType="com.qing.pojo.User">
        select * from mybatis.user
    </select>
    <!--id對應接口的方法，返回值類型對應接口返回值，參數類型對應接口方法參數，集合類型寫集合泛型類型-->
    <!--根據ID查詢用戶-->
    <select id="getUserById" parameterType="int" resultType="com.qing.pojo.User">
        select * from mybatis.user where id=#{id}
    </select>
</mapper>

package com.qing.dao;

import com.qing.pojo.User;
import java.util.List;

/**
 * 接口
 */
public interface UserMapper {

    /**
     * 查詢全部用戶
     * @return
     */
    List<User> getUserList();

    /**
     * 根據ID查詢用戶
     * @param id
     * @return
     */
    User getUserById(int id);
}

package com.qing.dao;

import com.qing.pojo.User;
import com.qing.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class UserMapperTest {

    /**
     * 查詢全部用戶
     */
    @Test
    public void getUserList() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            List<User> userList = mapper.getUserList();
            for (User user : userList) {
                System.out.println(user);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }

    /**
     * 根據ID查詢用戶
     */
    @Test
    public void getUserById() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            User user = mapper.getUserById(1);
            System.out.println(user);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }
}

insert/update/delete 增刪改必須提交事務

編寫接口

package com.qing.dao;

import com.qing.pojo.User;

import java.util.List;

/**
 * 接口
 */
public interface UserMapper {

    /**
     * 查詢全部用戶
     *
     * @return
     */
    List<User> getUserList();

    /**
     * 根據ID查詢用戶
     *
     * @param id
     * @return
     */
    User getUserById(int id);

    /**
     * 新增用戶
     *
     * @param user
     * @return
     */
    int insert(User user);

    /**
     * 修改用戶
     * @param user
     * @return
     */
    int update(User user);

    /**
     * 刪除用戶
     * @param id
     * @return
     */
    int delete(int id);
}

編寫Mapper

<?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">
<!--命名空間綁定一個對應的接口-->
<mapper namespace="com.qing.dao.UserMapper">
    <!--查詢全部用戶-->
    <select id="getUserList" resultType="com.qing.pojo.User">
        select * from mybatis.user
    </select>
    <!--id對應接口的方法，返回值類型對應接口返回值，參數類型對應接口方法參數，集合類型寫集合泛型類型-->
    <!--根據ID查詢用戶-->
    <select id="getUserById" parameterType="int" resultType="com.qing.pojo.User">
        select * from mybatis.user where id=#{id}
    </select>
    <!--新增用戶-->
    <insert id="insert" parameterType="com.qing.pojo.User">
        insert into mybatis.user(id,name,pwd) values(#{id},#{name},#{pwd})
    </insert>
    <!--修改用戶-->
    <update id="update" parameterType="com.qing.pojo.User">
        update mybatis.user set name=#{name},pwd=#{pwd} where id=#{id}
    </update>
    <!--刪除用戶-->
    <delete id="delete" parameterType="int">
        delete from mybatis.user where id=#{id}
    </delete>
</mapper>

測試

package com.qing.dao;

import com.qing.pojo.User;
import com.qing.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

import java.util.List;

public class UserMapperTest {

    /**
     * 查詢全部用戶
     */
    @Test
    public void getUserList() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            List<User> userList = mapper.getUserList();
            for (User user : userList) {
                System.out.println(user);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }

    /**
     * 根據ID查詢用戶
     */
    @Test
    public void getUserById() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            User user = mapper.getUserById(1);
            System.out.println(user);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }

    /**
     * 新增用戶
     */
    @Test
    public void insert() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            User user = new User(4, "張仲景", "123456");
            int rows = mapper.insert(user);
            System.out.println(rows);
            // 提交事務
            sqlSession.commit();
            System.out.println("提交事務");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }

    /**
     * 修改用戶
     */
    @Test
    public void update() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            User user = new User(4, "張仲景二號", "123456");
            int rows = mapper.update(user);
            System.out.println(rows);
            // 提交事務
            sqlSession.commit();
            System.out.println("提交事務");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }

    /**
     * 刪除用戶
     */
    @Test
    public void delete() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            int rows = mapper.delete(4);
            System.out.println(rows);
            // 提交事務
            sqlSession.commit();
            System.out.println("提交事務");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }
}

Map的應用

Map傳遞參數，用key獲取即可

對象傳遞參數，用屬性獲取即可

只有一個基本類型參數，可以直接獲取，可不寫parameterType

編寫接口

package com.qing.dao;

import com.qing.pojo.User;

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

/**
 * 接口
 */
public interface UserMapper {

    /**
     * 通過Map新增用戶
     * @param map
     * @return
     */
    int insertByMap(Map<String,Object> map);

    /**
     * 通過Map查詢用戶
     * @param map
     * @return
     */
    List<User> getByMap(Map<String,Object> map);
}

編寫Mapper

<?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">
<!--命名空間綁定一個對應的接口-->
<mapper namespace="com.qing.dao.UserMapper">
    <!--通過Map新增用戶-->
    <insert id="insertByMap" parameterType="map">
        insert into mybatis.user(id,name,pwd) values(#{userId},#{userName},#{password})
    </insert>
    <!--通過Map查詢用戶-->
    <select id="getByMap" parameterType="map" resultType="com.qing.pojo.User">
        select * from mybatis.user where id=#{userId} and name=#{userName}
    </select>
</mapper>

測試

package com.qing.dao;

import com.qing.pojo.User;
import com.qing.utils.MybatisUtils;
import org.apache.ibatis.session.SqlSession;
import org.junit.Test;

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

public class UserMapperTest {

    /**
     * 通過Map新增用戶
     */
    @Test
    public void insertByMap() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            Map<String,Object> map = new HashMap<String, Object>();
            map.put("userId",4);
            map.put("userName","張仲景");
            map.put("password","123456");
            int rows = mapper.insertByMap(map);
            System.out.println(rows);
            // 提交事務
            sqlSession.commit();
            System.out.println("提交事務");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }

    /**
     * 通過Map查詢用戶
     */
    @Test
    public void getByMap() {
        SqlSession sqlSession = null;
        try {
            // 獲取sqlSession
            sqlSession = MybatisUtils.getSqlSession();
            // 執行SQL
            UserMapper mapper = sqlSession.getMapper(UserMapper.class);
            Map<String,Object> map = new HashMap<String, Object>();
            map.put("userId",4);
            map.put("userName","張仲景");
            List<User> userList = mapper.getByMap(map);
            for (User user : userList) {
                System.out.println(user);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 關閉sqlSession
            sqlSession.close();
        }
    }
}

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