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MyBatis_CURD

一、项目结构

二、代码实现

 1 package com.jmu.bean;
 2 
 3 public class Student {
 4   private Integer id;
 5   private String name;
 6   private double score;
 7   private int age;
 8 public Student() {
 9     super();
10 }
11 
12 public Student(String name, int age ,double score) {
13     super();
14     this.name = name;
15     this.score = score;
16     this.age = age;
17 }
18 
19 @Override
20 public String toString() {
21     return "Student [id=" + id + ", name=" + name + ", score=" + score + ", age=" + age + "]";
22 }
23 
24 public Integer getId() {
25     return id;
26 }
27 public void setId(Integer id) {
28     this.id = id;
29 }
30 public String getName() {
31     return name;
32 }
33 public void setName(String name) {
34     this.name = name;
35 }
36 public double getScore() {
37     return score;
38 }
39 public void setScore(double score) {
40     this.score = score;
41 }
42 public int getAge() {
43     return age;
44 }
45 public void setAge(int age) {
46     this.age = age;
47 }
48   
49 }

 1 package com.jmu.dao;
 2 
 3 
 4 
 5 import java.util.List;
 6 import java.util.Map;
 7 
 8 import com.jmu.bean.Student;
 9 
10 public interface IStudentDao {
11   void insertStudent (Student student);
12   void insertStudentCacheId(Student student);//插入后获取
13   
14   void deleteStudentById(int id);
15   void updateStudent(Student student);
16   
17   
18   List<Student> selectAllStudents();//查询所有
19   Map<String,Object> selectAllStudentsMap();
20    Student selectStudentById(int id);  //根据id查询
21    List<Student> selectStudentsByName(String name);//模糊查询
22 }
23

  1 package com.jmu.dao;
  2 
  3 import static org.hamcrest.CoreMatchers.nullValue;
  4 
  5 import java.io.IOException;
  6 import java.io.InputStream;
  7 import java.util.ArrayList;
  8 import java.util.HashMap;
  9 import java.util.List;
 10 import java.util.Map;
 11 
 12 import javax.persistence.MapKey;
 13 
 14 import org.apache.ibatis.io.Resources;
 15 import org.apache.ibatis.session.SqlSession;
 16 import org.apache.ibatis.session.SqlSessionFactory;
 17 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 18 
 19 import com.jmu.bean.Student;
 20 import com.jmu.utils.MybatisUtils;
 21 
 22 public class StudentDaoImpl implements IStudentDao {
 23 
 24     private InputStream inputStream;
 25     private SqlSession sqlSession;
 26 
 27     @Override
 28     public void insertStudent(Student student) {
 29         // TODO Auto-generated method stub
 30         try {
 31             /*
 32              * // 1、加载主配置文件 inputStream =
 33              * Resources.getResourceAsStream("mybatis-config.xml"); //
 34              * 2、创建SqlSessionFactory对象 SqlSessionFactory sqlSessionFactory = new
 35              * SqlSessionFactoryBuilder().build(inputStream); sqlSession =
 36              * sqlSessionFactory.openSession(); // 4、相关操作
 37              */
 38             sqlSession = MybatisUtils.getSqlSession();
 39             sqlSession.insert("insertStudent", student);
 40             sqlSession.commit();
 41         } finally {
 42 
 43             if (sqlSession != null) {
 44                 sqlSession.close();
 45             }
 46         }
 47     }
 48 
 49     @Override
 50     public void insertStudentCacheId(Student student) {
 51         // TODO Auto-generated method stub
 52         try {
 53 
 54             sqlSession = MybatisUtils.getSqlSession();
 55             sqlSession.insert("insertStudentCacheId", student);
 56             sqlSession.commit();
 57         } finally {
 58 
 59             if (sqlSession != null) {
 60                 sqlSession.close();
 61             }
 62         }
 63     }
 64 
 65     @Override
 66     public void deleteStudentById(int id) {
 67         // TODO Auto-generated method stub
 68         try {
 69 
 70             sqlSession = MybatisUtils.getSqlSession();
 71             sqlSession.update("deleteStudentById", id);
 72             sqlSession.commit();
 73         } finally {
 74 
 75             if (sqlSession != null) {
 76                 sqlSession.close();
 77             }
 78         }
 79     }
 80 
 81     @Override
 82     public void updateStudent(Student student) {
 83         // TODO Auto-generated method stub
 84         try {
 85 
 86             sqlSession = MybatisUtils.getSqlSession();
 87             sqlSession.update("updateStudent", student);
 88             sqlSession.commit();
 89         } finally {
 90 
 91             if (sqlSession != null) {
 92                 sqlSession.close();
 93             }
 94         }
 95     }
 96 
 97     @Override
 98     public List<Student> selectAllStudents() {
 99         // TODO Auto-generated method stub
100         List<Student> students =new ArrayList<Student>();
101         try {
102             sqlSession=MybatisUtils.getSqlSession();
103             students=sqlSession.selectList("selectAllStudents");
104             
105         } finally {
106             if (sqlSession!=null) {
107                 sqlSession.close();
108                 
109             }
110         }
111         
112         return students;
113     }
114 
115     @Override
116     public Map<String, Object> selectAllStudentsMap() {
117         // TODO Auto-generated method stub
118         Map<String, Object> map=new HashMap<>();
119         try {
120             sqlSession=MybatisUtils.getSqlSession();
121             map=sqlSession.selectMap("selectAllStudents", "name");
122         } finally {
123             // TODO: handle finally clause
124             if (sqlSession!=null) {
125                 sqlSession.close();
126             }
127         }
128         return map;
129     }
130 
131     @Override
132     public Student selectStudentById(int id) {
133         // TODO Auto-generated method stub
134         Student student=null;
135         try {
136             sqlSession=MybatisUtils.getSqlSession();
137             student=sqlSession.selectOne("selectStudentById", id);
138             
139         } finally {
140             // TODO: handle finally clause
141             if (sqlSession!=null) {
142                 sqlSession.close();
143                 
144             }
145         }
146         return student;
147     }
148 
149     @Override
150     public List<Student> selectStudentsByName(String name) {
151         // TODO Auto-generated method stub
152         List<Student> students =new ArrayList<Student>();
153         try {
154             sqlSession=MybatisUtils.getSqlSession();
155             students=sqlSession.selectList("selectStudentByName",name);
156             
157         } finally {
158             if (sqlSession!=null) {
159                 sqlSession.close();
160                 
161             }
162         }
163         return students;
164     }
165 
166 }

<?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.jmu.dao">
<insert id="insertStudent" parameterType="Student">
insert into
student(name,age,score) values(#{name},#{age},#{score})
</insert>

<insert id="insertStudentCacheId">
insert into student(name,age,score) values(#{name},#{age},#{score})
<selectKey resultType="int" keyProperty="id" order="AFTER">
select @@identity
</selectKey>
</insert>
<delete id="deleteStudentById">
delete from student where id=#{XXX}
</delete>
<update id="updateStudent">
update student set name=#{name},age=#{age},score=#{score} where id=#{id}
</update>
<select id="selectAllStudents" resultType="Student">
select id,name,age,score from student
</select>
<select id="selectStudentById" resultType="Student">
select id,name,age,score from student where id=#{JJJ}
</select>
<select id="selectStudentByName" resultType="Student">



select id,name,age,score from student where name like '%' #{XXX} '%'

</select>
</mapper>

 1 package com.jmu.utils;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 
 6 import org.apache.ibatis.io.Resources;
 7 import org.apache.ibatis.session.SqlSession;
 8 import org.apache.ibatis.session.SqlSessionFactory;
 9 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
10 
11 public class MybatisUtils {
12     private static SqlSessionFactory sqlSessionFactory;
13 
14     public static SqlSession getSqlSession() {
15 
16         try {
17             InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
18             if (sqlSessionFactory == null) {
19                 sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
20 
21             }
22             return sqlSessionFactory.openSession();
23         } catch (IOException e) {
24             // TODO Auto-generated catch block
25             e.printStackTrace();
26         }
27 
28         return null;
29 
30     }
31 }

1 jdbc.driver=com.mysql.jdbc.Driver
2 jdbc.url=jdbc:mysql://127.0.0.1:3306/test
3 jdbc.username=root
4 jdbc.password=123456

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE configuration
 3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 4 "http://mybatis.org/dtd/mybatis-3-config.dtd">
 5 <configuration>
 6 <properties resource="jdbc_mysql.properties"> </properties>
 7 <typeAliases >
 8   <package name="com.jmu.bean"   />
 9 </typeAliases>
10 <!--配置运行环境  -->
11     <environments default="development">
12         <environment id="development">
13             <transactionManager type="JDBC" />
14             <dataSource type="POOLED">
15                 <property name="driver" value="${jdbc.driver}" />
16                 <property name="url"
17                     value="${jdbc.url}" />
18                 <property name="username" value="${jdbc.username}" />
19                 <property name="password" value="${jdbc.password}" />
20             </dataSource>
21         </environment> 
22     </environments>
23     <!--注册映射文件 -->
24     <mappers>
25         <mapper resource="com/jmu/dao/mapper.xml" />
26     </mappers>
27 </configuration>

 1 package com.jmu.test;
 2 
 3 import static org.junit.Assert.*;
 4 
 5 import java.util.List;
 6 import java.util.Map;
 7 
 8 import org.junit.Before;
 9 import org.junit.Test;
10 
11 import com.jmu.bean.Student;
12 import com.jmu.dao.IStudentDao;
13 import com.jmu.dao.StudentDaoImpl;
14 
15 public class MyTest {
16     private IStudentDao dao;
17 
18     @Before
19     public void Before() {
20         dao = new StudentDaoImpl();
21     }
22 
23     
24   
25     @Test
26     public void test01() {
27         Student student = new Student("明明",19,87.9);
28         System.out.println("插入前：student="+student);
29         dao.insertStudent(student);
30         System.out.println("插入后：student="+student);
31     }
32     //插入后获取
33     @Test
34     public void test02(){
35         Student student =new Student("明明",23,99.5);
36         System.out.println("插入前：student="+student);
37         dao.insertStudentCacheId(student);
38         System.out.println("插入后：student="+student);
39     }
40     @Test
41     public void test03(){
42      dao.deleteStudentById(25);
43     }
44     @Test
45     public void test04(){
46      Student student=new Student("红酒",23,93.5);
47      student.setId(28);
48      dao.updateStudent(student);
49     } 
50     @Test
51     public void test05(){
52      List<Student> students=dao.selectAllStudents();
53      for(Student student : students){
54          System.out.println(student);
55      }
56     } 
57     @Test
58     public void test06(){
59      Map<String, Object> map = dao.selectAllStudentsMap();
60      System.out.println(map.get("王维"));
61     } 
62     @Test
63     public void test07(){
64      Student student=dao.selectStudentById(33);
65      System.out.println(student);
66     }
67     @Test
68     public void test08(){
69      List<Student>  students = dao.selectStudentsByName("王二");
70       for (Student student : students) {
71         System.out.println(student);
72     }
73     }
74    
75   
76 }

插入前：student=Student [id=null, name=明明, score=87.9, age=19]
DEBUG [main] - ==>  Preparing: insert into student(name,age,score) values(?,?,?) 
DEBUG [main] - ==> Parameters: 明明(String), 19(Integer), 87.9(Double)
DEBUG [main] - <==    Updates: 1
插入后：student=Student [id=null, name=明明, score=87.9, age=19]
插入前：student=Student [id=null, name=明明, score=99.5, age=23]
DEBUG [main] - ==>  Preparing: insert into student(name,age,score) values(?,?,?) 
DEBUG [main] - ==> Parameters: 明明(String), 23(Integer), 99.5(Double)
DEBUG [main] - <==    Updates: 1
DEBUG [main] - ==>  Preparing: select @@identity 
DEBUG [main] - ==> Parameters: 
DEBUG [main] - <==      Total: 1
插入后：student=Student [id=118, name=明明, score=99.5, age=23]
DEBUG [main] - ==>  Preparing: delete from student where id=? 
DEBUG [main] - ==> Parameters: 25(Integer)
DEBUG [main] - <==    Updates: 0
DEBUG [main] - ==>  Preparing: update student set name=?,age=?,score=? where id=? 
DEBUG [main] - ==> Parameters: 红酒(String), 23(Integer), 93.5(Double), 28(Integer)
DEBUG [main] - <==    Updates: 1
DEBUG [main] - ==>  Preparing: select id,name,age,score from student 
DEBUG [main] - ==> Parameters: 
DEBUG [main] - <==      Total: 95
Student [id=17, name=王维, score=93.5, age=23]
Student [id=18, name=王维, score=93.5, age=23]
Student [id=19, name=王维, score=93.5, age=23]
Student [id=20, name=王维, score=93.5, age=23]
Student [id=21, name=王维, score=93.5, age=23]
Student [id=22, name=王维, score=93.5, age=23]
Student [id=23, name=王维, score=93.5, age=23]
Student [id=24, name=王维, score=93.5, age=23]
Student [id=26, name=王维, score=93.5, age=23]
Student [id=27, name=王维, score=93.5, age=23]
Student [id=28, name=红酒, score=93.5, age=23]
Student [id=29, name=安抚王二, score=93.5, age=23]
Student [id=30, name=王维一, score=93.5, age=23]
Student [id=31, name=王维二, score=93.5, age=23]
Student [id=32, name=王二分, score=93.5, age=23]
Student [id=33, name=王二维, score=93.5, age=23]
Student [id=34, name=王问维, score=93.5, age=23]
Student [id=35, name=王维, score=93.5, age=23]
Student [id=36, name=明明, score=87.9, age=19]
Student [id=37, name=明明, score=99.5, age=23]
Student [id=38, name=明明, score=87.9, age=19]
Student [id=39, name=明明, score=99.5, age=23]
Student [id=40, name=明明, score=87.9, age=19]
Student [id=41, name=明明, score=99.5, age=23]
Student [id=42, name=明明, score=87.9, age=19]
Student [id=43, name=明明, score=99.5, age=23]
Student [id=44, name=明明, score=87.9, age=19]
Student [id=45, name=明明, score=99.5, age=23]
Student [id=46, name=明明, score=87.9, age=19]
Student [id=47, name=明明, score=99.5, age=23]
Student [id=48, name=明明, score=87.9, age=19]
Student [id=49, name=明明, score=99.5, age=23]
Student [id=50, name=明明, score=87.9, age=19]
Student [id=51, name=明明, score=99.5, age=23]
Student [id=52, name=明明, score=87.9, age=19]
Student [id=53, name=明明, score=99.5, age=23]
Student [id=54, name=明明, score=87.9, age=19]
Student [id=55, name=明明, score=99.5, age=23]
Student [id=56, name=明明, score=87.9, age=19]
Student [id=57, name=明明, score=99.5, age=23]
Student [id=58, name=明明, score=87.9, age=19]
Student [id=59, name=明明, score=99.5, age=23]
Student [id=60, name=明明, score=87.9, age=19]
Student [id=61, name=明明, score=99.5, age=23]
Student [id=62, name=明明, score=87.9, age=19]
Student [id=63, name=明明, score=99.5, age=23]
Student [id=64, name=明明, score=87.9, age=19]
Student [id=65, name=明明, score=99.5, age=23]
Student [id=66, name=明明, score=87.9, age=19]
Student [id=67, name=明明, score=99.5, age=23]
Student [id=68, name=明明, score=87.9, age=19]
Student [id=69, name=明明, score=99.5, age=23]
Student [id=70, name=明明, score=87.9, age=19]
Student [id=71, name=明明, score=99.5, age=23]
Student [id=72, name=明明, score=87.9, age=19]
Student [id=73, name=明明, score=99.5, age=23]
Student [id=74, name=明明, score=87.9, age=19]
Student [id=75, name=明明, score=99.5, age=23]
Student [id=76, name=明明, score=87.9, age=19]
Student [id=77, name=明明, score=99.5, age=23]
Student [id=78, name=明明, score=87.9, age=19]
Student [id=79, name=明明, score=99.5, age=23]
Student [id=80, name=明明, score=87.9, age=19]
Student [id=81, name=明明, score=99.5, age=23]
Student [id=82, name=明明, score=87.9, age=19]
Student [id=83, name=明明, score=99.5, age=23]
Student [id=84, name=明明, score=87.9, age=19]
Student [id=85, name=明明, score=99.5, age=23]
Student [id=86, name=明明, score=87.9, age=19]
Student [id=87, name=明明, score=99.5, age=23]
Student [id=88, name=明明, score=87.9, age=19]
Student [id=89, name=明明, score=99.5, age=23]
Student [id=90, name=明明, score=87.9, age=19]
Student [id=91, name=明明, score=99.5, age=23]
Student [id=92, name=明明, score=87.9, age=19]
Student [id=93, name=明明, score=99.5, age=23]
Student [id=94, name=明明, score=87.9, age=19]
Student [id=95, name=明明, score=99.5, age=23]
Student [id=100, name=明明, score=87.9, age=19]
Student [id=101, name=明明, score=99.5, age=23]
Student [id=104, name=明明, score=87.9, age=19]
Student [id=105, name=明明, score=99.5, age=23]
Student [id=106, name=明明, score=87.9, age=19]
Student [id=107, name=明明, score=87.9, age=19]
Student [id=108, name=明明, score=87.9, age=19]
Student [id=109, name=明明, score=87.9, age=19]
Student [id=110, name=明明, score=87.9, age=19]
Student [id=111, name=明明, score=87.9, age=19]
Student [id=112, name=明明, score=87.9, age=19]
Student [id=113, name=明明, score=87.9, age=19]
Student [id=114, name=明明, score=99.5, age=23]
Student [id=115, name=明明, score=87.9, age=19]
Student [id=116, name=明明, score=99.5, age=23]
Student [id=117, name=明明, score=87.9, age=19]
Student [id=118, name=明明, score=99.5, age=23]
DEBUG [main] - ==>  Preparing: select id,name,age,score from student 
DEBUG [main] - ==> Parameters: 
DEBUG [main] - <==      Total: 95
Student [id=35, name=王维, score=93.5, age=23]
DEBUG [main] - ==>  Preparing: select id,name,age,score from student where id=? 
DEBUG [main] - ==> Parameters: 33(Integer)
DEBUG [main] - <==      Total: 1
Student [id=33, name=王二维, score=93.5, age=23]
DEBUG [main] - ==>  Preparing: select id,name,age,score from student where name like '%王二%' 
DEBUG [main] - ==> Parameters: 
DEBUG [main] - <==      Total: 3
Student [id=29, name=安抚王二, score=93.5, age=23]
Student [id=32, name=王二分, score=93.5, age=23]
Student [id=33, name=王二维, score=93.5, age=23]

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原文地址：https://www.cnblogs.com/hoje/p/8087428.html