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Mybatis（二）：怎样使用Mybatis

2020年04月03日  | 移动技术网IT编程  | 我要评论

一、创建项目（本文以idea基于maven构建的项目为例）

  • new——>project

 

 

 

 

 

 

 

 

 

  • 笔者这里是选择自己本地的maven及配置

 

 

 

  • 最后点击finish即可

 

 

 

二、在配置文件中添加依赖包

  • pom.xml配置文件中添加mybatis、jdbc驱动、log4j日志管理的包依赖
  • 完整代码如下：
<?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.zhurouwangzi</groupid>
  <artifactid>mybatisdemo</artifactid>
  <version>1.0-snapshot</version>

  <name>mybatisdemo</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>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <!--mybatis版本-->
    <mybatis.version>3.2.7</mybatis.version>
    <!--log4j版本-->
    <slf4j.version>1.6.6</slf4j.version>
    <log4j.version>1.2.12</log4j.version>
  </properties>

  <dependencies>
    <dependency>
      <groupid>junit</groupid>
      <artifactid>junit</artifactid>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <!-- mybatis核心包 -->
    <dependency>
      <groupid>org.mybatis</groupid>
      <artifactid>mybatis</artifactid>
      <version>${mybatis.version}</version>
    </dependency>
    <!-- mysql驱动包 -->
    <dependency>
      <groupid>mysql</groupid>
      <artifactid>mysql-connector-java</artifactid>
      <version>5.1.29</version>
    </dependency>

    <!-- 日志文件管理包 -->
    <!-- log start -->
    <dependency>
      <groupid>log4j</groupid>
      <artifactid>log4j</artifactid>
      <version>${log4j.version}</version>
    </dependency>
    <dependency>
      <groupid>org.slf4j</groupid>
      <artifactid>slf4j-api</artifactid>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupid>org.slf4j</groupid>
      <artifactid>slf4j-log4j12</artifactid>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupid>org.junit.jupiter</groupid>
      <artifactid>junit-jupiter-api</artifactid>
      <version>release</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

  <build>
    <pluginmanagement><!-- lock down plugins versions to avoid using maven defaults (may be moved to parent pom) -->
      <plugins>
        <!-- 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>
  • 等依赖包下载完了之后我们在项目这里可以看到：

 

 

 

  •  在src下添加一个resource文件夹，然后鼠标右键mark directory as resources root

 

 

  •  在src/resource文件夹下创建sqlmapconfig.xml作为mybatis的全局配置文件
  • 在src/resource然后再创建一个log4j.properties文件用来配置日志文件的配置
  • 在src/resource再创建一个sqlmap文件夹用来存放mybatis的映射文件
  • 创建好的项目结构如下：

 

 

 


三、设置mybatis相关配置文件

  • log4j.properties配置文件的内容如下：
# global logging configuration
log4j.rootlogger=debug, stdout
# console output...
log4j.appender.stdout=org.apache.log4j.consoleappender
log4j.appender.stdout.layout=org.apache.log4j.patternlayout
log4j.appender.stdout.layout.conversionpattern=%5p [%t] - %m%n
  • sqlmapconfig.xml配置文件内容如下：
<?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>
    <!-- 和spring整合后 environments配置将废除-->
    <environments default="development">
        <environment id="development">
            <!-- 使用jdbc事务管理-->
            <transactionmanager type="jdbc" />
            <!-- 数据库连接池-->
            <datasource type="pooled">
                <property name="driver" value="com.mysql.jdbc.driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/web_test3?characterencoding=utf-8" />
                <property name="username" value="root" />
                <property name="password" value="root" />
            </datasource>
        </environment>
    </environments>

</configuration>

 

四、创建实体类

 

 

 

package com.zhurouwangzi.entity;

public class userbaseinfo {
    private int id;
    private string username;

    @override
    public string tostring(){
        return "user [id=" + id + ", username=" + username+ "]";
    }

    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;
    }
}
  • 在src/resource/sqlmap文件夹下添加user.xml作为userbaseinfo的映射文件

 

 

 

<?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">
<!-- namespace是命名空间，作用sql语句的隔离，后面还有重要作用
#{}作用就是占位符，相当于jdbc的“?”
parametertype：查询的参数类型
resulttype：查询结果的数据类型，如果时候pojo应该给全路径。
-->
<mapper namespace="test">
    <select id="getuserbyid" parametertype="int" resulttype="com.zhurouwangzi.entity.userbaseinfo">
        select * from user_baseinfo where id = #{id}
    </select>
</mapper>
  • 在sqlmapconfig.xml配置文件中添加<mappers>配置：

 

五、用测试方法区测试

  • 代码如下：
package com.zhurouwangzi.service;

import com.zhurouwangzi.entity.userbaseinfo;
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.jupiter.api.test;

import java.io.inputstream;

public class mybatistest {

    @test
    public void test() throws exception{
        //1.创建一个sqlsessionfactorybuilder对象
        sqlsessionfactorybuilder sqlsessionfactorybuilder = new sqlsessionfactorybuilder();
        //2.加载配置文件
        inputstream inputstream = resources.getresourceasstream("sqlmapconfig.xml");
        //3.创建sqlsessionfactory工厂对象
        sqlsessionfactory sqlsessionfactory = sqlsessionfactorybuilder.build(inputstream);
        //4.获取sqlsession对象
        sqlsession sqlsession = sqlsessionfactory.opensession();
        //5.执行sql语句
        userbaseinfo userbaseinfo = sqlsession.selectone("getuserbyid", 16);
        system.out.println(userbaseinfo);
        //关闭资源
        sqlsession.close();
    }
}

运行结果如下：

 

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