标签：last name gender 改查 IDEA public Maven id String

一：IDEA使用Maven搭建MyBatis

1.新建一个文件夹，IDEA中的project其实就相当于eclipse中的工作空间（工作文件夹），改成自己想要的名字，并打开这个文件夹

File→Open→文件夹→OK

2.右键这个项目，新建一个Module，在IDEA中Module就相当于eclipse中的project

二：在pom.xml中导入以下代码

导入后maven会自动下载这些jar包

<?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>cn</groupId>
  <artifactId>ssm</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
 
  <name>ssm Maven Webapp</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>
  </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>3.3.0</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 -->
             <dependency>
                 <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.17</version>
            </dependency>
            <dependency>
                 <groupId>org.slf4j</groupId>
                 <artifactId>slf4j-api</artifactId>
                <version>1.7.12</version>
            </dependency>
               <dependency>
                <groupId>org.slf4j</groupId>
                 <artifactId>slf4j-log4j12</artifactId>
                 <version>1.7.12</version>
             </dependency>
 
  </dependencies>
 
  <build>
      <resources>
          <resource>
              <directory>${basedir}/src/main/java</directory>
              <includes>
                  <include>**/*.properties</include>
                  <include>**/*.xml</include>
              </includes>
          </resource>
          <resource>
              <directory>${basedir}/src/main/resources</directory>
          </resource>
      </resources>
    <finalName>ssm</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.7.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.20.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.0</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>
      </plugins>
    </pluginManagement>
  </build>
</project>

3.建表

4.①编写MyBatis的Xml配置文件，②编写实体类， ③dao层接口，④和EmpMapper.xml文件中的SQL语句

MyBatis-config.xml配置文件中写入以下代码

 注意：更改自己的数据库帐号密码还有连接的数据库的名字

<?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>
    <!-- 环境配置 -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <!-- 数据库连接相关配置 ,这里动态获取config.properties文件中的内容-->
            <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>
    <!-- mapping文件路径配置 -->
    <mappers>
        <mapper resource="mapper/EmpMapper.xml"/>
    </mappers>
 
</configuration>

实体类：

/**
 * @author ipllt
 * @create 2018-12-06 下午 1:05
 */
public class Emp {
    private int id;
    private String last_name;
    private String gender;
    private String email;
 
 
    public String toString() {
        return "Emp{" +
                "id=" + id +
                ", last_name='" + last_name + '\'' +
                ", gender='" + gender + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
 
    public Emp() {
    }
 
    public Emp(int id, String last_name, String gender, String email) {
        this.id = id;
        this.last_name = last_name;
        this.gender = gender;
        this.email = email;
    }
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public String getLast_name() {
        return last_name;
    }
 
    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }
 
    public String getGender() {
        return gender;
    }
 
    public void setGender(String gender) {
        this.gender = gender;
    }
 
    public String getEmail() {
        return email;
    }
 
    public void setEmail(String email) {
        this.email = email;
    }
}

dao层

public interface EmpMapper {
 
    /**mybatis中与empxml文件绑定的接口
     * 按照ID查员工的方法*/
    Emp getEmpById(int id);
 
    //添加员工
    void addEmp(Emp emp);
 
    //更新员工
  void updateEmp(Emp emp);
 
    //通过ID删除员工
   void deleteEmpById(int id);
 
}

EmpMapper.xml

<?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">
 
 
<!-- 将空间改为接口中的全类名-->
 
<mapper namespace="com.pl.dao.EmpMapper">
 
<!-- 将ID改为接口中的方法名-->
    <select id="getEmpById" parameterType="int" resultType="com.pl.pojo.Emp">
 select * from tbl_employee where id = #{id}
 
</select>
    <insert id="addEmp" parameterType="com.pl.pojo.Emp">
        insert into tbl_employee(last_name,gender,email)
        value (#{last_name},#{gender},#{email})
    </insert>
    <update id="updateEmp">
        update tbl_employee
        set last_name=#{last_name},gender=#{gender},email=#{email}
        where id=#{id}
    </update>
 
    <!-- 删除-->
    <delete id="deleteEmpById">
        delete from tbl_employee where id=#{id}
    </delete>
</mapper>

5.在测试类中新建测试类，并运行

public class EmpTest {
 
    @Test
    public void empFindByIdTest(){
        //定义读取文件名
        String resources = "mybatis-config.xml";
 
        //创建流
        Reader reader = null;
 
        try {
            //读取mybatis config.xml到reader对象中
            reader = Resources.getResourceAsReader(resources);
        }catch (IOException e){
            e.printStackTrace();
        }
 
        //初始化mybatis，创建SqlSessionFactory
        SqlSessionFactory sqlMapper = new SqlSessionFactoryBuilder().build(reader);
 
        //创建Session实例
        SqlSession session = sqlMapper.openSession();
 
        //传入参数，返回结果
        Emp emp = session.selectOne("com.pl.pojo.Emp.findById",2);
 
        System.out.println(emp.toString());
 
        //关闭session
        session.close();
    }
 
    public SqlSessionFactory getSqlSessionFactory()throws IOException{
 
        String resources = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resources);
        return new SqlSessionFactoryBuilder().build(inputStream);
 
    }
 
    @Test
    public void test02() throws IOException{
        //获取sqlsessionFactory
       SqlSessionFactory sqlSessionFactory=  getSqlSessionFactory();
 
       //获取sqlsession对象
        SqlSession openSession = sqlSessionFactory.openSession();
 
       try {
 
 
        //获取接口的实现类对象
       EmpMapper mapper = openSession.getMapper(EmpMapper.class);
 
       Emp emp = mapper.getEmpById(3);
 
        System.out.println(emp.toString());
       }finally {
           openSession.close();
       }
    }
 
    @Test
    public void test03()throws IOException{
        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
 
        SqlSession openSession = sqlSessionFactory.openSession();
 
 
        try {
            EmpMapper mapper = openSession.getMapper(EmpMapper.class);
 
            //添加
//            Emp emp = new Emp(6,"hahhh","1","666@qq.com");
//            mapper.addEmp(emp);
 
            //修改
//            Emp emp = new Emp(1,"tom","1","888@qq.com");
//            mapper.updateEmp(emp);
 
            //删除
            mapper.deleteEmpById(4);
 
            openSession.commit();
        }finally {
            openSession.close();
        }
    }
}

标签：last,name,gender,改查,IDEA,public,Maven,id,String
来源： https://blog.csdn.net/qq_45626418/article/details/120384295

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