2.MyBatis的增刪查改
阿新 • • 發佈：2021-11-29
1.建立資料庫
2.資料庫連線測試
3.匯入依賴：mysql、mybatis、junit
4.編寫mybatis-config.xml核心配置檔案
5.編寫Utils工具類
6.編寫實體類
7.編寫Mapper
8.Mapper檔案註冊
9.資源過濾
10.測試
1.建立資料庫
2.資料庫連線測試
3.匯入依賴：mysql、mybatis、junit
依賴程式碼
<!--匯入依賴--> <dependencies> <!--MySql驅動架包--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <!--MyBatis架包--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency> <!--單元測試架包--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.13.1</version> <scope>test</scope> </dependency> </dependencies>
4.編寫mybatis-config.xml核心配置檔案
Mybatis核心配置檔案
<?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核心配置檔案--> <!-- 配置檔案的根元素 --> <configuration> <!-- 和spring整合後 environments配置將廢除 --> <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?useSSL=false"/> <property name="username" value="root"/> <property name="password" value="123456"/> </dataSource> </environment> </environments> </configuration>
5.編寫Utils工具類
點選檢視程式碼
package com.user102; 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.InputStream; public class Utils { private static SqlSessionFactory sqlSessionFactory; static { try { String resources="mybatis-config.xml"; InputStream inputStream = Resources.getResourceAsStream(resources); sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); }catch (Exception e){ System.out.println(e.getMessage()); } } public static SqlSession getSqlSession(){ return sqlSessionFactory.openSession(); } }
6.編寫實體類
點選檢視程式碼
package com.user102.pojo;
public class Student {
private String sno;
private String sname;
private int age;
private String sex;
private String address;
public Student(String sno, String sname, int age, String sex, String address) {
this.sno = sno;
this.sname = sname;
this.age = age;
this.sex = sex;
this.address = address;
}
@Override
public String toString() {
return "Student{" +
"sno='" + sno + '\'' +
", sname='" + sname + '\'' +
", age=" + age +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}'+"\n";
}
public String getSno() {
return sno;
}
public void setSno(String sno) {
this.sno = sno;
}
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
7.編寫Mapper
Mapper介面
public interface StudentMapper {
public int addStudent(Student student);
public int subStudent(String sno);
public int updateStudent(Student student);
public Student getStudentForSno(String sno);
}
點選檢視程式碼
<?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.user102.dao.StudentMapper">
<insert id="addStudent" parameterType="com.user102.pojo.Student">
insert into mybatis.student values('${sno}','${sname}',${age},'${sex}','${address}')
</insert>
<delete id="subStudent" parameterType="String">
delete from mybatis.student where sno='${sno}'
</delete>
<update id="updateStudent" parameterType="com.user102.pojo.Student">
update mybatis.student set sno='${sno}',sname='${sname}',age=${age},sex='${sex}',address='${address}'
where sno='${sno}'
</update>
<select id="getStudentForSno" parameterType="String" resultType="com.user102.pojo.Student">
select * from mybatis.student where sno='${sno}'
</select>
</mapper>
8.Mapper檔案註冊
點選檢視程式碼
<mappers>
<mapper resource="com/user102/dao/StudentMapper.xml"></mapper>
</mappers>
9.資源過濾
程式碼過濾
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
10.測試
①增加
點選檢視程式碼
public void addStudent(){
SqlSession sqlSession = Utils.getSqlSession();
StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
mapper.addStudent(new Student("160121454125","愚公公",60,"男","太行山"));
sqlSession.commit();
sqlSession.close();
}
②刪除
點選檢視程式碼
public void subStudent(){
SqlSession sqlSession = Utils.getSqlSession();
StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
mapper.subStudent("160121454124");
sqlSession.commit();
sqlSession.close();
}
③改
點選檢視程式碼
public void updateStudent(){
SqlSession sqlSession = Utils.getSqlSession();
StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
mapper.updateStudent(new Student("160121454125","姜太公",80,"男","湖中亭"));
sqlSession.commit();
sqlSession.close();
}
④查
點選檢視程式碼
public void getStudentForId(){
SqlSession sqlSession = Utils.getSqlSession();
StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
Student studentForSno = mapper.getStudentForSno("160121454125");
System.out.println(studentForSno);
sqlSession.commit();
sqlSession.close();
}