20、SSM框架-Mybatis接口编程方式实现增删改查 （2）

   前面一章已经搭建好了eclipse,mybatis,mysql的环境，并且实现了一个简单的查询。请注意，这种方式是用SqlSession实例来直接执行已映射的SQL语句：

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session.selectOne("com.mucfc.model.EmployeerMapper.findEmployeerByID", 1);  

session.selectOne("com.mucfc.model.EmployeerMapper.findEmployeerByID", 1);

其实还有更简单的方法，而且是更好的方法，使用合理描述参数和SQL语句返回值的接口（比如EmployeerMapper.java），这样现在就可以至此那个更简单，更安全的代码，没有容易发生的字符串文字和转换的错误.下面是详细过程:

本文要改成以接口类来实现增删改查

整个工程目录 ：



本文示例工程免费下载

1、首先还是mybatis的配置文件mybatis-config.xml

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<?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">  
<!-- 这是根标签  -->  
<configuration>  
    <!-- 元素允许在主配置文件之外提供一个properties格式对应文件，从而使得主配置文件更加通用。这样对部署非常有用  -->  
     <properties resource="mysql.properties" />   
    <!-- 设置别名，一定要放在properties下面  -->  
    <typeAliases>  
        <typeAlias alias="Employeer" type="com.mucfc.model.Employeer"  />  
    </typeAliases>  
    <!-- 配置数据源相关的信息  -->  
    <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/test?characterEncoding=UTF-8"/>   
            <property name="username" value="root"/>   
            <property name="password" value="christmas258@"/>  -->  
            <property name="driver" value="${driver}" />  
                <property name="url" value="${url}" />  
                <property name="username" value="${username}" />  
                <property name="password" value="${password}" />   
            </dataSource>  
        </environment>  
    </environments>  
    <!-- 列出映射文件 -->  
    <mappers>  
        <mapper resource="com/mucfc/model/Employeer.xml" />  
    </mappers>  
</configuration>  

<?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">
<!-- 这是根标签  -->
<configuration>
<!-- 元素允许在主配置文件之外提供一个properties格式对应文件，从而使得主配置文件更加通用。这样对部署非常有用  -->
<properties resource="mysql.properties" />
<!-- 设置别名，一定要放在properties下面  -->
<typeAliases>
<typeAlias alias="Employeer" type="com.mucfc.model.Employeer"  />
</typeAliases>
<!-- 配置数据源相关的信息  -->
<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/test?characterEncoding=UTF-8"/>
<property name="username" value="root"/>
<property name="password" value="christmas258@"/>  -->
<property name="driver" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
</dataSource>
</environment>
</environments>
<!-- 列出映射文件 -->
<mappers>
<mapper resource="com/mucfc/model/Employeer.xml" />
</mappers>
</configuration>

其中配置文件mysql.properties

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driver=com.mysql.jdbc.Driver  
url=jdbc:mysql://localhost:3306/test?charset=utf8  
username=root  
password=christmas258@  

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/test?charset=utf8
username=root
password=christmas258@

2、数据表对应的类Employeer.JAVA

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package com.mucfc.model;  
  
import java.io.Serializable;  
  
/** 
 * 雇员信息类 
 *@author linbingwen 
 *@time 2015.5.11 
 */  
public class Employeer {  
    private Integer employeer_id;  
    private String employeer_name;  
    private Integer employeer_age ;  
    private String employeer_department;  
    private String employeer_worktype;  
      
    public Employeer() {  
        super();  
    }  
    public Integer getEmployeer_id() {  
        return employeer_id;  
    }  
    public void setEmployeer_id(Integer employeer_id) {  
        this.employeer_id = employeer_id;  
    }  
    public String getEmployeer_name() {  
        return employeer_name;  
    }  
    public void setEmployeer_name(String employeer_name) {  
        this.employeer_name = employeer_name;  
    }  
    public Integer getEmployeer_age() {  
        return employeer_age;  
    }  
    public void setEmployeer_age(Integer employeer_age) {  
        this.employeer_age = employeer_age;  
    }  
    public String getEmployeer_department() {  
        return employeer_department;  
    }  
    public void setEmployeer_department(String employeer_department) {  
        this.employeer_department = employeer_department;  
    }  
    public String getEmployeer_worktype() {  
        return employeer_worktype;  
    }  
    public void setEmployeer_worktype(String employeer_worktype) {  
        this.employeer_worktype = employeer_worktype;  
    }  
    @Override  
    public String toString() {  
        return "Employeer [employeer_id=" + employeer_id + ", employeer_name="  
                + employeer_name + ", employeer_age=" + employeer_age  
                + ", employeer_department=" + employeer_department  
                + ", employeer_worktype=" + employeer_worktype + "]";  
    }  
      
  
  
}  

package com.mucfc.model;

import java.io.Serializable;

/**
* 雇员信息类
*@author linbingwen
*@time 2015.5.11
*/
public class Employeer {
private Integer employeer_id;
private String employeer_name;
private Integer employeer_age ;
private String employeer_department;
private String employeer_worktype;

public Employeer() {
super();
}
public Integer getEmployeer_id() {
return employeer_id;
}
public void setEmployeer_id(Integer employeer_id) {
this.employeer_id = employeer_id;
}
public String getEmployeer_name() {
return employeer_name;
}
public void setEmployeer_name(String employeer_name) {
this.employeer_name = employeer_name;
}
public Integer getEmployeer_age() {
return employeer_age;
}
public void setEmployeer_age(Integer employeer_age) {
this.employeer_age = employeer_age;
}
public String getEmployeer_department() {
return employeer_department;
}
public void setEmployeer_department(String employeer_department) {
this.employeer_department = employeer_department;
}
public String getEmployeer_worktype() {
return employeer_worktype;
}
public void setEmployeer_worktype(String employeer_worktype) {
this.employeer_worktype = employeer_worktype;
}
@Override
public String toString() {
return "Employeer [employeer_id=" + employeer_id + ", employeer_name="
+ employeer_name + ", employeer_age=" + employeer_age
+ ", employeer_department=" + employeer_department
+ ", employeer_worktype=" + employeer_worktype + "]";
}

}

然后是SQL语句的配置Employeer.xml：

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<?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.mucfc.mapper.EmployeerMapper">  
   
     <!-- 查找 -->  
     <select id="findEmployeerByID" parameterType="int" resultType="Employeer">  
     select* from `t_employeer` where employeer_id =#{employeer_id}  
     </select>  
       
      <!-- 插入 -->    
      <!-- useGeneratedKeys设置为"true"表明要MyBatis获取由数据库自动生成的主键；keyProperty="id"指定把获取到的主键值注入到Employeer的id属性 -->   
    <insert id="addEmployeer" parameterType="Employeer"  
    useGeneratedKeys="true" keyProperty="employeer_id">    
        insert into `t_employeer`(employeer_name,employeer_age,employeer_department,employeer_worktype)   
        values(#{employeer_name},#{employeer_age},#{employeer_department},#{employeer_worktype})    
    </insert>    
      
     <!-- 删除  -->  
    <delete id="deleteEmployeer" parameterType="int">    
        delete from `t_employeer` where employeer_id = #{employeer_id}    
    </delete>    
      
    <!-- 修改 -->    
    <update id="updateEmployeer" parameterType="Employeer">    
        update t_employeer set employeer_name = #{employeer_name},employeer_age= #{employeer_age},employeer_department = #{employeer_department}  
        ,employeer_worktype=#{employeer_worktype}  where employeer_id = #{employeer_id}    
    </update>    
      
 </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">
<mapper namespace="com.mucfc.mapper.EmployeerMapper">

<!-- 查找 -->
<select id="findEmployeerByID" parameterType="int" resultType="Employeer">
select* from `t_employeer` where employeer_id =#{employeer_id}
</select>

<!-- 插入 -->
<!-- useGeneratedKeys设置为"true"表明要MyBatis获取由数据库自动生成的主键；keyProperty="id"指定把获取到的主键值注入到Employeer的id属性 -->
<insert id="addEmployeer" parameterType="Employeer"
useGeneratedKeys="true" keyProperty="employeer_id">
insert into `t_employeer`(employeer_name,employeer_age,employeer_department,employeer_worktype)
values(#{employeer_name},#{employeer_age},#{employeer_department},#{employeer_worktype})
</insert>

<!-- 删除  -->
<delete id="deleteEmployeer" parameterType="int">
delete from `t_employeer` where employeer_id = #{employeer_id}
</delete>

<!-- 修改 -->
<update id="updateEmployeer" parameterType="Employeer">
update t_employeer set employeer_name = #{employeer_name},employeer_age= #{employeer_age},employeer_department = #{employeer_department}
,employeer_worktype=#{employeer_worktype}  where employeer_id = #{employeer_id}
</update>

</mapper>

注意com.mucfc.mapper.EmployeerMapper这个类是存在的，它是一个接口类，上一讲我们是使用com.mucfc.model.EmployeerMapper，而上一讲的这个类是不存在的

4、SQL语句映射类EmployeerMapper.java

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package com.mucfc.mapper;  
  
import com.mucfc.model.Employeer;  
  
/** 
 * SQL语句映射类 
 * @author linbingwen 
 * @time 2015.5.11 
 */  
public interface EmployeerMapper {  
    /** 
     * 注意要和Employeer.xml的方法名对应 
     */  
    public Employeer findEmployeerByID(int id);  
  
    /** 
     * 注意要和Employeer.xml的方法名对应 
     */  
    public void addEmployeer(Employeer employeer);  
  
    /** 
     * 注意要和Employeer.xml的方法名对应 
     */  
    public void deleteEmployeer(int id);  
  
    /** 
     * 注意要和Employeer.xml的方法名对应 
     */  
    public void updateEmployeer(Employeer employeer);  
  
}  

package com.mucfc.mapper;

import com.mucfc.model.Employeer;

/**
* SQL语句映射类
* @author linbingwen
* @time 2015.5.11
*/
public interface EmployeerMapper {
/**
* 注意要和Employeer.xml的方法名对应
*/
public Employeer findEmployeerByID(int id);

/**
* 注意要和Employeer.xml的方法名对应
*/
public void addEmployeer(Employeer employeer);

/**
* 注意要和Employeer.xml的方法名对应
*/
public void deleteEmployeer(int id);

/**
* 注意要和Employeer.xml的方法名对应
*/
public void updateEmployeer(Employeer employeer);

}

5、测试：
（1）增加命令

上一讲中的方式：

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/** 
 * 增加 
 */  
public static void addEmployeer(Employeer employeer){  
    SqlSession session = null;  
    try {  
        session = sqlSessionFactory.openSession();  
         //返回值是记录条数    
           int resultCount = session.insert("com.mucfc.model.EmployeerMapper.addEmployeer", employeer );    
           System.out.printf("当前插入的employeer_id :%d    当前插入数据库中条数:%d " , employeer.getEmployeer_id() ,resultCount);  //获取插入对象的id    
           System.out.println("");  
           session.commit() ;         
    } finally {  
        session.close();  
    }  
      
}  

/**
* 增加
*/
public static void addEmployeer(Employeer employeer){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
//返回值是记录条数
int resultCount = session.insert("com.mucfc.model.EmployeerMapper.addEmployeer", employeer );
System.out.printf("当前插入的employeer_id :%d    当前插入数据库中条数:%d " , employeer.getEmployeer_id() ,resultCount);  //获取插入对象的id
System.out.println("");
session.commit() ;
} finally {
session.close();
}

}

改成以接口编程的方式：

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/** 
 * 增加 
 */  
public static void addEmployeer(Employeer employeer){  
    SqlSession session = null;  
    try {  
        session = sqlSessionFactory.openSession();  
        EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
        employeerMapper.addEmployeer(employeer);  
           session.commit() ;         
    } finally {  
        session.close();  
    }  
      
}  

/**
* 增加
*/
public static void addEmployeer(Employeer employeer){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
employeerMapper.addEmployeer(employeer);
session.commit() ;
} finally {
session.close();
}

}

（2）删除命令

上一讲中的方式：

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/** 
 * 删除 
 *  
 */  
public static void deleteEmployeer(int id){  
    SqlSession session = null;  
    try {  
        session = sqlSessionFactory.openSession();  
         //返回值是记录条数    
         int resultCount=session.delete("com.mucfc.model.EmployeerMapper.deleteEmployeer",id);   
          System.out.println("当前删除数据库中条数: "+resultCount);  //获取插入对象的id    
           session.commit() ;         
    } finally {  
        session.close();  
    }  
}  

/**
* 删除
*
*/
public static void deleteEmployeer(int id){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
//返回值是记录条数
int resultCount=session.delete("com.mucfc.model.EmployeerMapper.deleteEmployeer",id);
System.out.println("当前删除数据库中条数: "+resultCount);  //获取插入对象的id
session.commit() ;
} finally {
session.close();
}
}

改成以接口编程的方式：

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/** 
 * 删除 
 *  
 */  
public static void deleteEmployeer(int id){  
    SqlSession session = null;  
    try {  
        session = sqlSessionFactory.openSession();  
        EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
        employeerMapper.deleteEmployeer(id);  
           session.commit() ;         
    } finally {  
        session.close();  
    }  
}  

/**
* 删除
*
*/
public static void deleteEmployeer(int id){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
employeerMapper.deleteEmployeer(id);
session.commit() ;
} finally {
session.close();
}
}

（3）查找命令

上一讲中的方式：

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/** 
 * 查找 
 */  
public static void findEmployeerById(int id) {  
    SqlSession session = null;  
    try {  
        session = sqlSessionFactory.openSession();  
        Employeer employeer = (Employeer) session.selectOne(  
                "com.mucfc.model.EmployeerMapper.findEmployeerByID", 1);  
        if (employeer == null)  
            System.out.println("null");  
        else  
            System.out.println(employeer);  
    } finally {  
        session.close();  
    }  
}  

/**
* 查找
*/
public static void findEmployeerById(int id) {
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
Employeer employeer = (Employeer) session.selectOne(
"com.mucfc.model.EmployeerMapper.findEmployeerByID", 1);
if (employeer == null)
System.out.println("null");
else
System.out.println(employeer);
} finally {
session.close();
}
}

改成以接口编程的方式：

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/** 
     * 查找 
     */  
    public static void findEmployeerById(int id) {  
        SqlSession session = null;  
        try {  
            session = sqlSessionFactory.openSession();  
            EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
            Employeer employeer=employeerMapper.findEmployeerByID(id);  
            if (employeer == null)  
                System.out.println("null");  
            else  
                System.out.println(employeer);  
        } finally {  
            session.close();  
        }  
    }  

/**
* 查找
*/
public static void findEmployeerById(int id) {
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
Employeer employeer=employeerMapper.findEmployeerByID(id);
if (employeer == null)
System.out.println("null");
else
System.out.println(employeer);
} finally {
session.close();
}
}

（4）修改命令

上一讲中的方式：

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/** 
 * 更改 
 */  
public static void updateEmployeer(Employeer employeer){  
    SqlSession session = null;  
    try {  
        session = sqlSessionFactory.openSession();   
           session.update("com.mucfc.model.EmployeerMapper.updateEmployeer",employeer);      
           session.commit() ;         
    } finally {  
        session.close();  
    }  
      
}  

/**
* 更改
*/
public static void updateEmployeer(Employeer employeer){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
session.update("com.mucfc.model.EmployeerMapper.updateEmployeer",employeer);
session.commit() ;
} finally {
session.close();
}

}

改成以接口编程的方式：

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/** 
 * 更改 
 */  
public static void updateEmployeer(Employeer employeer){  
    SqlSession session = null;  
    try {  
        session = sqlSessionFactory.openSession();   
        EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
        employeerMapper.updateEmployeer(employeer);  
           session.commit() ;         
    } finally {  
        session.close();  
    }  
      
}  

/**
* 更改
*/
public static void updateEmployeer(Employeer employeer){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
employeerMapper.updateEmployeer(employeer);
session.commit() ;
} finally {
session.close();
}

}

这是一个完整的测试：

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package com.mucfc.test;  
  
import java.io.IOException;  
import java.io.Reader;  
  
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 com.mucfc.mapper.EmployeerMapper;  
import com.mucfc.model.Employeer;  
  
public class MybatisTest {  
    private static SqlSessionFactory sqlSessionFactory;  
    private static Reader reader;  
    static {  
        try {  
            reader = Resources.getResourceAsReader("mybatis-config.xml");  
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
  
    /** 
     * 查找 
     */  
    public static void findEmployeerById(int id) {  
        SqlSession session = null;  
        try {  
            session = sqlSessionFactory.openSession();  
            EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
            Employeer employeer=employeerMapper.findEmployeerByID(id);  
            if (employeer == null)  
                System.out.println("null");  
            else  
                System.out.println(employeer);  
        } finally {  
            session.close();  
        }  
    }  
    /** 
     * 增加 
     */  
    public static void addEmployeer(Employeer employeer){  
        SqlSession session = null;  
        try {  
            session = sqlSessionFactory.openSession();  
            EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
            employeerMapper.addEmployeer(employeer);  
            session.commit() ;            
        } finally {  
            session.close();  
        }  
          
    }  
    /** 
     * 删除 
     *  
     */  
    public static void deleteEmployeer(int id){  
        SqlSession session = null;  
        try {  
            session = sqlSessionFactory.openSession();  
            EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
            employeerMapper.deleteEmployeer(id);  
            session.commit() ;            
        } finally {  
            session.close();  
        }  
    }  
    /** 
     * 更改 
     */  
    public static void updateEmployeer(Employeer employeer){  
        SqlSession session = null;  
        try {  
            session = sqlSessionFactory.openSession();   
            EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);  
            employeerMapper.updateEmployeer(employeer);  
            session.commit() ;            
        } finally {  
            session.close();  
        }  
          
    }  
  
    public static void main(String[] args) {                              
        Employeer employeer1=new Employeer();  
        employeer1.setEmployeer_name("李四");  
        employeer1.setEmployeer_age(23);  
        employeer1.setEmployeer_department("产品一部");  
        employeer1.setEmployeer_worktype("开发工程师");  
          
        Employeer employeer2=new Employeer();  
        employeer2.setEmployeer_name("张三");  
        employeer2.setEmployeer_age(30);  
        employeer2.setEmployeer_department("产品二部");  
        employeer2.setEmployeer_worktype("测试工程师");  
          
        Employeer employeer3=new Employeer();  
        employeer3.setEmployeer_name("小王");  
        employeer3.setEmployeer_age(22);  
        employeer3.setEmployeer_department("产品三部");  
        employeer3.setEmployeer_worktype("数据分析师");  
          
          
        Employeer employeer4=new Employeer();  
        employeer4.setEmployeer_name("明明");  
        employeer4.setEmployeer_age(22);  
        employeer4.setEmployeer_department("财会部");  
        employeer4.setEmployeer_worktype("财务人员");  
      
        //插入  
        addEmployeer(employeer1);  
        addEmployeer(employeer2);  
        addEmployeer(employeer3);  
        addEmployeer(employeer4);  
        findEmployeerById(26);  
        deleteEmployeer(27);  
          
        //更改  
        employeer2.setEmployeer_id(28);  
        employeer2.setEmployeer_age(21);  
        employeer2.setEmployeer_department("产品四部");  
        updateEmployeer(employeer2);  
  
    }  
  
}  

package com.mucfc.test;

import java.io.IOException;
import java.io.Reader;

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 com.mucfc.mapper.EmployeerMapper;
import com.mucfc.model.Employeer;

public class MybatisTest {
private static SqlSessionFactory sqlSessionFactory;
private static Reader reader;
static {
try {
reader = Resources.getResourceAsReader("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (Exception e) {
e.printStackTrace();
}
}

/**
* 查找
*/
public static void findEmployeerById(int id) {
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
Employeer employeer=employeerMapper.findEmployeerByID(id);
if (employeer == null)
System.out.println("null");
else
System.out.println(employeer);
} finally {
session.close();
}
}
/**
* 增加
*/
public static void addEmployeer(Employeer employeer){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
employeerMapper.addEmployeer(employeer);
session.commit() ;
} finally {
session.close();
}

}
/**
* 删除
*
*/
public static void deleteEmployeer(int id){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
employeerMapper.deleteEmployeer(id);
session.commit() ;
} finally {
session.close();
}
}
/**
* 更改
*/
public static void updateEmployeer(Employeer employeer){
SqlSession session = null;
try {
session = sqlSessionFactory.openSession();
EmployeerMapper employeerMapper=session.getMapper(EmployeerMapper.class);
employeerMapper.updateEmployeer(employeer);
session.commit() ;
} finally {
session.close();
}

}

public static void main(String[] args) {
Employeer employeer1=new Employeer();
employeer1.setEmployeer_name("李四");
employeer1.setEmployeer_age(23);
employeer1.setEmployeer_department("产品一部");
employeer1.setEmployeer_worktype("开发工程师");

Employeer employeer2=new Employeer();
employeer2.setEmployeer_name("张三");
employeer2.setEmployeer_age(30);
employeer2.setEmployeer_department("产品二部");
employeer2.setEmployeer_worktype("测试工程师");

Employeer employeer3=new Employeer();
employeer3.setEmployeer_name("小王");
employeer3.setEmployeer_age(22);
employeer3.setEmployeer_department("产品三部");
employeer3.setEmployeer_worktype("数据分析师");

Employeer employeer4=new Employeer();
employeer4.setEmployeer_name("明明");
employeer4.setEmployeer_age(22);
employeer4.setEmployeer_department("财会部");
employeer4.setEmployeer_worktype("财务人员");

//插入
addEmployeer(employeer1);
addEmployeer(employeer2);
addEmployeer(employeer3);
addEmployeer(employeer4);
findEmployeerById(26);
deleteEmployeer(27);

//更改
employeer2.setEmployeer_id(28);
employeer2.setEmployeer_age(21);
employeer2.setEmployeer_department("产品四部");
updateEmployeer(employeer2);

}

}

测试结果：

插入了4条数据，ID为25~28

然后27号被删除

29号被修改




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