MyBatis 入门（一）

 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  <settings>
 7       <setting name="cacheEnabled" value="true"/>
 8       
 9   </settings>
10     <!--  -->
11   <environments default="development">
12     <environment id="development">
13     <!-- 事务处理方式 -->
14       <transactionManager type="JDBC"/>
15       <!-- 数据源 ：提供数据库连接池 -->
16       <dataSource type="POOLED">
17           <!-- 驱动 -->
18         <property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
19         <!--  -->
20         <property name="url" value="jdbc:oracle:thin:@localhost:1521:xe"/>
21         <property name="username" value="super_user"/>
22         <property name="password" value="abc123"/>
23       </dataSource>
24     </environment>
25   </environments>
26   
27   
28   <!-- 映射文件，可以配置多个 -->
29   <mappers>
30     <mapper resource="dao/grade.xml"/>
31     
32   </mappers>
33  
34   
35 </configuration>

  1 <?xml version="1.0" encoding="UTF-8" ?>
  2 <!DOCTYPE mapper
  3   PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  4   "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  5 <mapper namespace="dao.MyBatis01Dao">
  6 <cache eviction="FIFO" flushInterval="60000" size="512" readOnly="true"/>
  7 <!-- parameterType="int" 指定传入参数类型   id最好与接口里面的方法名一致-->
  8   <select id="testgetGrade" resultType="entity.Grade">
  9     select * from grade where gradeid=1
 10   </select>
 11    <resultMap type="entity.Grade" id="gradeMap">
 12       
 13   </resultMap>
 14   <select id="testBatis1" parameterType="int" resultMap="gradeMap">
 15     select * from grade where gradeid>=#{gradeid}
 16   </select>
 17  <select id="seleTrend" parameterType="entity.Grade" resultType="entity.Grade">
 18       select * from grade where 1=1
 19       <if test ="gradeid != null">
 20           <![CDATA[
 21               and gradeid<= #{gradeid}
 22           ]]>
 23           
 24       </if>
 25       <if test ="gradename != null">
 26           <!-- 模糊查询 -->
 27           <![CDATA[
 28           and gradename like ‘%${gradename}%‘
 29           ]]>
 30       </if>
 31       
 32       
 33   </select>
 34   
 35   <insert id="insertGrade" parameterType="entity.Grade" flushCache="true"  >
 36       insert into grade values(#{gradeid},#{gradename})
 37   
 38   </insert>
 39   <insert id="insertGradeBySeq" parameterType="entity.Grade" flushCache="true">
 40       <selectKey keyProperty="gradeid" resultType="int" order="BEFORE">
 41           select seq_gradeindex.nextVal from dual
 42       </selectKey>
 43       insert into grade values(#{gradeid},#{gradename})
 44   
 45   </insert>
 46    <delete id="delGrade" parameterType="entity.Grade" flushCache="true"  >
 47       delete grade where gradeid=#{gradeid}
 48   
 49   </delete>
 50   <update id="upGrade" parameterType="entity.Grade" flushCache="true"  >
 51       update grade set gradename=#{gradename} where gradeid=#{gradeid}
 52   
 53   </update>
 54   
 55   
 56   
 57   <!-- 动态查询 -->
 58   <select id="testTrendSele1" parameterType="entity.Student" resultType="entity.Student">
 59       select * from student where 1=1
 60       <if test="stuno != null">
 61           <![CDATA[
 62           and stuno<=#{stuno}
 63           ]]>
 64           
 65       </if>
 66       <if test="name != null">
 67           <![CDATA[
 68           and name like ‘%${name}%‘
 69           ]]>
 70       </if>
 71       <if test="gradeid != null">
 72           <![CDATA[
 73           and gradeid>=#{gradeid}
 74           ]]>
 75       </if>
 76   
 77   </select>
 78   <!-- MyBatis where 查询  -->
 79   <select id="testTrendSeleByWhere" parameterType="entity.Student" resultType="entity.Student">
 80       select * from student 
 81       <where>
 82       <if test="stuno != null">
 83           <![CDATA[
 84           and stuno<=#{stuno}
 85           ]]>
 86           
 87       </if>
 88       <if test="name != null">
 89           <![CDATA[
 90           and name like ‘%${name}%‘
 91           ]]>
 92       </if>
 93       <if test="gradeid != null">
 94           <![CDATA[
 95           and gradeid>=#{gradeid}
 96           ]]>
 97       </if>
 98       </where>
 99   
100   </select>
101   <!-- choose查询 -->
102   <select id="testTrendSeleByChoose" parameterType="entity.Student" resultType="entity.Student">
103   
104   select * from student where 1=1
105   <choose>
106   <when test="stuno != null">
107   <![CDATA[
108           and stuno<=#{stuno}
109           ]]>
110   </when>
111   <when test="name != null">
112   <![CDATA[
113           and name like ‘%${name}%‘
114           ]]>
115   </when>
116   <otherwise>
117   <![CDATA[
118           and gradeid>=#{gradeid}
119           ]]>
120   </otherwise>
121   </choose>
122   
123   </select>
124   <!-- set 动态更新 -->
125   <update id="testTrendSeleBySet" parameterType="entity.Grade">
126       update grade
127       <set>
128           <if test="gradename != null">
129               gradename=#{gradename}
130           </if>
131           
132       </set>
133       where gradeid=#{gradeid}
134   
135   </update>
136   
137 </mapper>

  1 package dao.impl;
  2 
  3 import java.io.Reader;
  4 import java.util.List;
  5 
  6 import junit.framework.TestCase;
  7 import org.apache.ibatis.io.Resources;
  8 import org.apache.ibatis.session.SqlSession;
  9 import org.apache.ibatis.session.SqlSessionFactory;
 10 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 11 import org.junit.Test;
 12 
 13 import util.MyBatisUtil;
 14 
 15 import dao.MyBatis01Dao;
 16 import entity.Grade;
 17 import entity.Student;
 18 
 19 public class GradeImplDao  extends TestCase  implements MyBatis01Dao{
 20 
 21     
 22     String resource="mybatis-config.xml";
 23     Reader reader=null;
 24     SqlSessionFactory factory=null;
 25     SqlSession session=null;
 26     /**
 27      * 测试 有参方法
 28      */
 29     
 30     public void testV(){
 31         try {
 32             //session=(new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource))).openSession();
 33              //MyBatis01Dao con=session.getMapper(MyBatis01Dao.class);
 34              //con.testBatis1(5);
 35             
 36             //testBatis1(2);
 37 //            Grade grade=new Grade();
 38 //            grade.setGradeid(7);
 39 //            grade.setGradename("");
 40             //delGrade(grade);
 41             //insertGrade(grade);
 42             //upGrade(grade);
 43             //seleTrend(grade);
 44             Student student=new Student(25,"ab%d",2);
 45             //testTrendSele1(student);
 46             testTrendSeleByChoose(student);
 47             //testTrendSeleByWhere(student);
 48             //testTrendSeleBySet(student);
 49         } catch (Exception e) {
 50             // TODO: handle exception
 51             e.printStackTrace();
 52         }
 53         finally{
 54             //session.close();
 55         }
 56         
 57     }
 58     /**
 59      * 第一个mybatis查询
 60      */
 61 
 62     public void testgetGrade(){
 63         try {
 64             //读取配置文件
 65             reader=Resources.getResourceAsReader(resource);
 66             SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();
 67             //创建sqlsessionfactory
 68             factory=builder.build(reader);
 69             session=factory.openSession();
 70             //读取
 71             List grade=session.selectList("testgetGrade");
 72             System.out.println(grade);
 73         } catch (Exception e) {
 74             // TODO: handle exception
 75             e.printStackTrace();
 76         }finally{
 77             session.close();
 78             
 79         }
 80         
 81         
 82     }
 83     
 84     /**
 85      * 传入一个参数查询  seleGradeByPara
 86      */
 87     public void testBatis1(int id){
 88         try {
 89             //创建并且打开session
 90             session=(new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource))).openSession();
 91             //设置参数
 92             List grade=session.selectList("testBatis1",id);
 93             System.out.println(grade);
 94         } catch (Exception e) {
 95             e.printStackTrace();
 96         }finally{
 97             //关闭
 98             session.close();
 99             
100         }
101     }
102     
103     
104     
105     
106     /**
107      * 新增
108      */
109     @Override
110     public void insertGrade(Grade grade) {
111         try {
112             //打开
113             session=(new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource))).openSession();
114             //新增
115             session.insert("insertGrade",grade);
116             session.commit();
117             //显示
118             System.out.println(session.selectList("testBatis1",1)); 
119         } catch (Exception e) {
120             // TODO: handle exception
121             e.printStackTrace();
122         }finally{
123             session.close();
124         }
125         
126     }
127     
128     /**
129      * 删除指定
130      * @param grade
131      */
132     public void delGrade(Grade grade){
133         try {
134             session=(new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource))).openSession();
135             session.delete("delGrade",grade);
136             session.commit();
137             System.out.println(session.selectList("testBatis1",1)); 
138             
139         } catch (Exception e) {
140             // TODO: handle exception
141             e.printStackTrace();
142         }finally{
143             session.close();
144         }
145         
146     }
147     /**
148      * 更新
149      * @param grade
150      */
151     public void upGrade(Grade grade){
152         try {
153             session=(new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource))).openSession();
154             session.update("upGrade",grade);
155             session.commit();
156             System.out.println(session.selectList("testBatis1",1)); 
157         } catch (Exception e) {
158             // TODO: handle exception
159             e.printStackTrace();
160         }finally{
161             session.close();
162         }
163     }
164     
165     /**
166      * 动态查询
167      * @param grade
168      */
169     public void seleTrend(Grade grade){
170         try {
171             session=(new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource))).openSession();
172             
173             System.out.println(session.selectList("seleTrend", grade));
174             
175         } catch (Exception e) {
176             // TODO: handle exception
177             e.printStackTrace();
178         }finally{
179             session.close();
180         }
181         
182     }
183     
184     /**
185      * 测试更新
186      */
187     public void testForUpdate(){
188         try {
189             session=new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource)).openSession();
190             Grade grade=new Grade();
191             grade.setGradename("研究院");
192             session.insert("insertGradeBySeq",grade);
193             session.commit();
194         } catch (Exception e) {
195             // TODO: handle exception
196             e.printStackTrace();
197             session.rollback();
198         }finally{
199             session.close();
200             
201         }
202         
203     }
204 
205     @Override
206     public void testTrendSele1(Student student) {
207         try {
208             //System.out.println("111111111");
209             session=(new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource))).openSession();
210             List students=session.selectList("testTrendSele1",student);
211             for(int i=0;i<students.size();i++){
212                 System.out.println(students.get(i));
213                 
214                 
215             }
216             
217             
218         } catch (Exception e) {
219             e.printStackTrace();
220         }
221         finally{
222             if(session != null)
223             session.close();
224         }
225     }
226 
227     @Override
228     public void testTrendSeleByWhere(Student student) {
229         // TODO Auto-generated method stub
230         try {
231             session=new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource)).openSession();
232             //代替 where 1=1 where字句
233             List students=session.selectList("testTrendSeleByWhere",student);
234             for(int i=0;i<students.size();i++){
235                 System.out.println(students.get(i));
236                 
237                 
238             }
239         } catch (Exception e) {
240             e.printStackTrace();
241         }
242         finally{
243             session.close();
244         }
245     }
246 
247     @Override
248     public void testTrendSeleByChoose(Student student) {
249         // TODO Auto-generated method stub
250         try {
251             session=MyBatisUtil.getSession();
252             //choose： 只查询 其中一个条件，从上到下执行
253             List students=session.selectList("testTrendSeleByChoose",student);
254             for(int i=0;i<students.size();i++){
255                 System.out.println(students.get(i));
256                 
257                 
258             }
259             MyBatisUtil.closeSession();
260             session=MyBatisUtil.getSession();
261             List students2=session.selectList("testTrendSeleByChoose",student);
262             System.out.println("---------"+(students==students2)+"----------");
263             
264         } catch (Exception e) {
265             e.printStackTrace();
266         }
267         finally{
268             MyBatisUtil.closeSession();
269         }
270         
271         
272     }
273 
274     @Override
275     public void testTrendSeleBySet(Student student) {
276         // TODO Auto-generated method stub
277         try {
278             session=new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader(resource)).openSession();
279             Grade grade=new Grade();
280             grade.setGradeid(2);
281             grade.setGradename("一年级");
282             session.update("testTrendSeleBySet", grade);
283             session.commit();
284             System.out.println("success!");
285         } catch (Exception e) {
286             e.printStackTrace();
287             session.rollback();
288         }
289         finally{
290             MyBatisUtil.closeSession();
291         }
292         
293         
294     }
295     
296     
297     @Test
298     public void testname() {
299         System.out.println("11111");
300     }
301     
302     
303     
304 }

 1 package entity;
 2 
 3 import java.io.Serializable;
 4 import java.util.HashSet;
 5 import java.util.Set;
 6 /**
 7  * 年级实体类
 8  * @author Administrator
 9  *
10  */
11 public class Grade implements Serializable{
12     //年级编号
13     private Integer gradeid;
14     //年级
15     private String gradename;
16     
17     @Override
18     public String toString() {
19         // TODO Auto-generated method stub
20         return gradeid+"\t"+gradename;
21     }
22     
23     public Grade(){}
24     
25     
26     public Integer getGradeid() {
27         return gradeid;
28     }
29     public void setGradeid(Integer gradeid) {
30         this.gradeid = gradeid;
31     }
32     public String getGradename() {
33         return gradename;
34     }
35     public void setGradename(String gradename) {
36         this.gradename = gradename;
37     }
38     
39     
40     
41 }