mybatis使用介绍

• 一、环境搭建
• 二、数据准备
• 三、配置核心配置文件
• 四、日志配置（可不配置）
• 五、创建实体
• 六、创建 Mapper 文件
• 七、注册 mapper 文件
• 八、运行测试
• 九、测试结果如下：

  创建 maven web 项目 mybatis01 并添加 maven 依赖如下。

    org.mybatis
    mybatis
    3.4.6


    mysql
    mysql-connector-java
    5.1.38


    ch.qos.logback
    logback-classic
    1.2.3

CREATE TABLE `pet` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) NOT NULL,
  `weight` double NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4;
insert  into `pet`(`id`,`name`,`weight`) values (1,'花花',4.5);
insert  into `pet`(`id`,`name`,`weight`) values (2,'白白',5.6);
insert  into `pet`(`id`,`name`,`weight`) values (3,'黑黑',7.8);
insert  into `pet`(`id`,`name`,`weight`) values (4,'红红',9);

  配置 mybatis 核心配置文件：mybatis-conf.xml，在 resource 目录下创建此文件，内容如下：

注意：

  dataSource 的类型可以配置成其内置类型之一， UNPOOLED、POOLED 、JNDI。

  UNPOOLED，MyBatis 会为每一个数据库操作创建一个新的连接，并关闭它。该方式适用于只有小规模数量并发用户的简单应用程序上。
  POOLED，MyBatis 会创建一个数据库连接池，连接池中的一个连接将会被用作数据库操作。一旦数据库操作完成，MyBatis 会将此连接返回给连接池。在开发或测试环境中，经常使用此种方式。
  JNDI，MyBatis 从在应用服务器向配置好的 JNDI 数据源 dataSource 获取数据库连接。在生产环境中，优先考虑这种方式。

  为了监控 mybatis 执行情况，我们通过 logback 打印相关程序运行情况。在 resource 下添加日志配置文件 logback.xml

    
    
        
            %d{yyyy-MM-dd HH:mm:ss} %-5p --- [%t] %-40.40logger{39} : %m%n
        
    
    
    
        
    

  加入该文件后，mybatis 运行情况、发送的 SQL、SQL 填充的数据和返回的数据条数都打印显示到控制台。

  创建对应实体，并添加对应的 getter 与 setter 方法。因为 mybatis 会使用反射完成对象的封装，所以实体一定需要无参构造方法。如果需要输出对象，还需要重写它的 toString 方法。

public class Pet{
    private Integer id;
    private String name;
    private Double weight 
}

  mybatis 的所有数据库操作都是通过 mapper 文件完成的。mapper 文件一般存放在 resource/mapper/ 目录下。

  创建实体类对应的映射文件 *Mapper.xml，详细如下代码所示：

<!--?xml version="1.0" encoding="UTF-8" ?-->
 
<mapper namespace="cn.hxzy.mapper.petMapper"> 
    <selec&#116; id="getById" parametertype="int" resulttype="cn.hxzy.entity.Pet">
        select * from pet wher&#101; id=#{id}
    </selec&#116;>
</mapper>
</pre> 
<p>  注意：</p> 
<p>  parameterType：参数类型</p> 
<p>  resultType：方法返回类型（如果返回是集合，则返回类型添集合存放对象的类型的全路径）</p> 
<p>  不论是参数类型还是返回类型，自定义类都需要写类的全路径名。</p> 
七、注册 mapper 文件 
<p>  在 mybatis 核心配置文件 mybatis-conf.xml 中注册上面的 *Mapper.xml。</p> 
<pre class='brush:php;toolbar:false'><mappers>
    <mapper resource="mapper/PetMapper.xml">
</mapper></mappers>
</pre> 
<p>下面是对这几个配置文件一点解释说明：<br /> 1、配置文件 mybatis-conf.xml 是 mybatis 用来建立 sessionFactory，里面主要包含了数据库连接相关内容。<br /> 2、mybatis-conf.xml 里面的 是包含要映射的类的 xml 配置文件。<br /> 3、在 *Mapper.xml 文件里面主要是定义各种 SQL 语句，以及这些语句的参数，以及要返回的类型等等。</p> 
八、运行测试 
<p>  创建 main 方法并完成相关测试。</p> 
<pre class='brush:php;toolbar:false'>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.Reader;

public class MainTest {
    public static void main(String[] args) throws IOException {
        //加载 mybatis 的核心配置文件（它也加载关联的映射文件）
        Reader reader = Resources.getResourceAsReader("mybatis-conf.xml");
        //构建 sqlSession 的工厂
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
        //创建能执行映射文件中 sql 的 sqlSession
        SqlSession session = sessionFactory.openSession();
        Object o = session.selectOne("cn.hxzy.mapper.petMapper.getById",3);
        System.out.println(o);
    }
}
</pre> 
<p>注意：</p> 
<p>1.selectOne 设计的初衷是查询单个，当查询时出现多个结果会报下面的错误：如果查询出来是集合用 selectList 方法。</p> 
<pre class='brush:php;toolbar:false'>org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 3
</pre> 
<p>2.SqlSessionFactory 线程安全性，可以设计成单例</p> 
<p>3.SqlSession 线程非安全，不能做类的公用变量<br /> 练习：</p> 
<p>1.创建项目 fruit01，并在项目中创建 fruit（id，name，color）实体和对应的数据库表，并完成根据 id 查询水果和查询全部水果功能。</p> 
<p><br /> </p> 
<p>参考代码：<br /> <br /> pom.xml代码如下：</p> 
<pre class='brush:php;toolbar:false'><?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>org.example</groupId>
    <artifactId>mybatis</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>fruit01</module>
    </modules>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jsp-api</artifactId>
            <version>8.5.59</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>
    </dependencies>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

</project>
</pre> 
<p></p> 
<pre class='brush:php;toolbar:false'><?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>fruit01</artifactId>

  <name>fruit01</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.48</version>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.2.6</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <groupId>org.codehaus.mojo</groupId>
          <artifactId>exec-maven-plugin</artifactId>
          <version>3.0.0</version>
          <executions>
            <execution>
              <goals>
                <goal>java</goal>
              </goals>
            </execution>
          </executions>
          <configuration>
            <classpathScope>test</classpathScope>
          </configuration>
        </plugin>
        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
        <plugin>
          <artifactId>maven-site-plugin</artifactId>
          <version>3.7.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-project-info-reports-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

</pre> 
<p><br /> App.java代码如下：</p> 
<pre class='brush:php;toolbar:false'>package org.example;

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.Reader;
import java.util.List;


public class App {
    public static void main(String[] args) throws IOException {
        //加载 mybatis 的核心配置文件（它也加载关联的映射文件）
        Reader reader = Resources.getResourceAsReader("mybatis-conf.xml");
        //构建 sqlSession 的工厂
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
        //创建能执行映射文件中 sql 的 sqlSession
        SqlSession session = sessionFactory.openSession();
        Fruit o = session.selectOne("com.allen.mapper.getById", 1);
        System.out.println(o.toString());
        List<Fruit> list = session.selectList("com.allen.mapper.findAll");
        System.out.println(list);
        session.close();
    }
}

</pre> 
<p><br /> Fruit代码内容如下：</p> 
<pre class='brush:php;toolbar:false'>package org.example;


public class Fruit {

  private Integer id;
  private String name;
  private String color;

  @Override
  public String toString() {
    return "Fruit{" +
            "id=" + id +
            ", name='" + name + ''' +
            ", color='" + color + ''' +
            '}';
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }


  public String getColor() {
    return color;
  }

  public void setColor(String color) {
    this.color = color;
  }

}

</pre> 
<p><br /> fruitMapper代码如下：</p> 
<pre class='brush:php;toolbar:false'><?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.allen.mapper">
    <select id="getById" parameterType="int" resultType="org.example.Fruit">
        select * from fruit wher&#101; id=#{id}
    </selec&#116;>
    <select id="findAll" resultType="org.example.Fruit">
        select * from fruit
    </select>
</mapper>
</pre> 
<p><br /> mybatis-conf.xml代码如下：</p> 
<pre class='brush:php;toolbar: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">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
                <property name="username" value="root" />
                <property name="password" value="123456" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mapper/fruitMapper.xml"></mapper>
    </mappers>
</configuration>
</pre> 
九、测试结果如下： 
<p></p></div>
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