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MyBatis 的简单应用

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介绍
    
1.例子中包含了 mybatis 的常用sql的写法
2.动态sql 的应用
3.存储过程的使用

  


目录
MyBatis 的简单应用

MyBatis-config.xml 中 set 的说明 []: 表示 可能的不太正确
    
<!-- 配置设置 -->
    <settings>
    	<!-- 配置全局性 cache 的 ( 开 / 关) default:true -->
		<setting name="cacheEnabled" value="true"/>
		
		<!-- 是否使用 懒加载 关联对象  同 hibernate中的延迟加载 一样  default:true -->
		<setting name="lazyLoadingEnabled" value="true"/>
		
		<!-- [当对象使用延迟加载时 属性的加载取决于能被引用到的那些延迟属性,否则,按需加载(需要的是时候才去加载)] -->
		<setting name="aggressiveLazyLoading" value="true"/>
		
		<!-- 是否允许单条sql 返回多个数据集  (取决于驱动的兼容性) default:true -->
		<setting name="multipleResultSetsEnabled" value="true"/>
		
		<!-- 是否可以使用列的别名 (取决于驱动的兼容性) default:true-->
		<setting name="useColumnLabel" value="true"/>
		
		<!--允许JDBC 生成主键。需要驱动器支持。如果设为了true,这个设置将强制使用被生成的主键,有一些驱动器不兼容不过仍然可以执行。  default:false-->
		<setting name="useGeneratedKeys" value="false"/>
		
		<!--指定 MyBatis 如何自动映射 数据基表的列 NONE:不隐射 PARTIAL:部分  FULL:全部-->
		<setting name="autoMappingBehavior" value="PARTIAL"/>
		
		<!-- 这是默认的执行类型 
			SIMPLE :简单  
			REUSE:执行器可能重复使用prepared statements 语句 
			BATCH:执行器可以重复执行语句和批量更新
		-->
		<setting name="defaultExecutorType" value="SIMPLE"/>
		
		<!-- 设置驱动等待数据响应的超时数  默认没有设置-->
		<setting name="defaultStatementTimeout" value="25000"/>
		
		<!-- [是否启用 行内嵌套语句  defaut:false] -->
		<setting name="safeRowBoundsEnabled" value="false"/>
		
		<!-- [是否 启用  数据中 A_column 自动映射 到 java类中驼峰命名的属性 default:fasle] -->
		<setting name="mapUnderscoreToCamelCase" value="false"/>
		
		<!-- 设置本地缓存范围 session:就会有数据的共享  statement:语句范围 (这样就不会有数据的共享 ) defalut:session -->
		<setting name="localCacheScope" value="SESSION"/>
		
		<!-- 设置但JDBC类型为空时,某些驱动程序 要指定值,default:other -->
		<setting name="jdbcTypeForNull" value="OTHER"/>
		
		<!-- 设置触发延迟加载的方法  -->
		<setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/>
		
	</settings>

  


表,序列 ,存储过程 的创建

存储过程
    
create or replace procedure pro_getAllStudent
(
v_sid number,
v_sname varchar2,
userList_cursor out sys_refcursor
)
as
begin
  update student set sname=v_sname where sid=v_sid;
  open userList_cursor for select* from student;
end;


  

测试
    
SQL> declare
  2  v_student_row student%rowtype;
  3  v_sid student.sid%type:=11;
  4  v_sname student.sname%type:='张浩';
  5  v_student_rows sys_refcursor;
  6  begin
  7  pro_getAllStudent(v_sid,v_sname,v_student_rows);
  8  loop
  9  fetch v_student_rows into v_student_row;
 10  exit when v_student_rows%notfound;
 11  Dbms_Output.put_line('第'||v_student_rows%rowcount||'行,学生id'||v_student_row.sid||'--姓名:'||v_student_row.sname);
 12  end loop;
 13  close v_student_rows;
 14  end;
 15  /

  

序列
    
-- Create sequence 
create sequence STUDENT_SEQ
minvalue 1
maxvalue 999999999999999999999999999
start with 32
increment by 1
cache 20;

  


学生表
    

create table STUDENT
(
  SID    NUMBER(8) primary key not null,
  SNAME  VARCHAR2(20) not null,
  MAJOR  VARCHAR2(100),
  BIRTH  DATE,
  SCORE  NUMBER(6,2),
  CID    NUMBER(8),
  STATUS CHAR(3)
)

  


班级表
    
-- Create table
create table CLASSES
(
  CID        NUMBER(8) primary key  not null,
  CNAME      VARCHAR2(20) not null,
  TEACHER    VARCHAR2(25),
  CREATEDATE DATE
)


  



mybatis-config.xml
    
<?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>

    <!-- 配置的元素顺序 properties?, settings?, typeAliases?, typeHandlers?, 
    objectFactory?, objectWrapperFactory?, proxyFactory?, plugins?, 
    environments?, databaseIdProvider?, mappers -->
     
    <!-- 使用属性文件 而且可以在这里这是 覆盖文件中的值 -->
    <properties resource="mybatis-config.properties">
    	<!-- 
    	<property name="username" value="admin"/>
    	<property name="password" value="123456"/>
    	 -->
    </properties>
   
	
    <!-- 别名的配置 -->
    <typeAliases>
		<typeAlias type="com.mybatis.student.Student" alias="Student"/>
		<typeAlias type="com.mybatis.classes.Classes" alias="Classes"/>
		<!-- 
			也可以使用 包范围来配置
			<package name="com.mybatis"/>
		 -->
	</typeAliases>
	
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC"/>
			<dataSource type="POOLED">
				<property name="driver" value="${driver}"/>
				<property name="url" value="${url}"/>
				<property name="username" value="${username}"/>
				<property name="password" value="${password}"/>
			</dataSource>
		</environment>
	</environments>
	
	<mappers>
		<mapper resource="com/mybatis/student/StudentMapper.xml"/>
		<mapper resource="com/mybatis/classes/ClassesMapper.xml"/>
	</mappers>
	
</configuration>

  


mybatis-config.properties
    
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
username=luob
password=luob

  


Student.java
    
package com.mybatis.student;

import java.io.Serializable;
import java.util.Date;

import com.mybatis.classes.Classes;

@SuppressWarnings("serial")
public class Student implements Serializable {
private int sid;
private String sname;
private String major;
private Date birth;
private float score;
private int cid;
private int status;
//get set

  


StudentMapper.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">
 <mapper namespace="com.mybatis.student">
   	<!-- <!ELEMENT mapper (
   		cache-ref | cache | resultMap* | parameterMap* | sql* 
   		| insert* | update* | delete* | select* )+> -->
   	
   	<!-- 设置缓存 如果用户需要登录 需要设置这种类型 type=org.mybatis.caches.oscache.LoggingOSCache-->
    <cache eviction="FIFO" readOnly="true" size="256" flushInterval="60000"/>
     
    <!-- 定义可以重用的sql 代码片段  -->
 	<sql id="studentColumns">sid,sname,score</sql>

	<!-- 自定义结果集 --> 	
 	<resultMap type="Student" id="studentResultMap">
 		<id property="sid" column="SID"/>
 		<result property="sname" column="SNAME"/>
 		<result property="score" column="SCORE"/>
 	</resultMap>
 	
 	<resultMap type="Student" id="studentAllResultMap">
 		<id property="sid" column="SID"/>
 		<result property="sname" column="SNAME"/>
 		<result property="major" column="MAJOR"/>
 		<result property="birth" column="BIRTH"/>
 		<result property="score" column="SCORE"/>
 		<result property="cid" column="CID"/>
 		<result property="status" column="STATUS"/>
 	</resultMap>
 	
 	<!-- 只用构造函数 创建对象 对于那些 比较少的列 -->
 	<resultMap type="Student" id="studentAndClassesResultMap">
 		<constructor>
 			<idArg column="SID" javaType="int"/>
 			<arg column="SNAME" javaType="String"/>
 			<arg column="SCORE" javaType="float"/>
 		</constructor>
 		<association property="classes" javaType="Classes" resultMap="com.mybatis.classes.classesResultMap"/>
 	</resultMap>
 
 
 	<select id="selectStudentAndClassBySname" parameterType="String" resultMap="studentAndClassesResultMap">
 		select s.sid,s.sname,s.score,c.cid,c.cname,c.teacher,c.createdate from student s left join classes c on s.cid=c.cid where s.sname=#{sname}
 	</select>
 
 	<insert id="addStudentBySequence" parameterType="Student" >
 	<selectKey keyProperty="sid" resultType="int" order="BEFORE">
 		select STUDENT_SEQ.nextVal from dual
 	</selectKey>
 		insert into student(sid,sname,major,birth,score)
    	values (#{sid},#{sname},#{major},#{birth},#{score})
 	</insert>
 	
 	<insert id="addStudent" parameterType="Student">
 		insert into student(sid,sname,major,birth,score)
 		values (#{sid},#{sname},#{major},#{birth},#{score})
 	</insert>
 	
 	<delete id="delStudentById" parameterType="int">
 		delete student where sid=#{sid}
 	</delete>
 	
 	<select id="queryAllStudent" resultType="Student" useCache="true" flushCache="false" timeout="10000">
 		select * from student
 	</select>
 	
 	<!-- 参数可以指定一个特定的数据类型  还可以使用自定类型处理: typeHandler=MyTypeHandler -->
 	<select id="queryStudentByName" resultType="Student" parameterType="String">
 		select * from student where sname like #{property,javaType=String,jdbcType=VARCHAR}
 	</select>
 	
 	<!-- 参数可以指定一个特定的数据类型 对于数字类型 ,numericScale=2  用于设置小数类型  -->
 	<select id="queryStudentById" resultType="Student" parameterType="int">
 		select * from student where sid=#{property,javaType=int,jdbcType=NUMERIC}
 	</select>
 	
 	
 	<update id="updStudentById" parameterType="Student">
 		update student 
 		<trim prefix="SET" suffixOverrides=",">
 			<if test="sname !=null">sname=#{sname},</if>
 			<if test="major !=null">majoir=#{major},</if>
 			<if test="birth !=null">birth=#{birth},</if>
 			<if test="score !=null">score=#{score}</if>
 		</trim>
 		where sid=#{sid}
 	</update>
 	
 	<!-- 在这里 利用了 可重用的sql代码片段 -->
 	<select id="selectMapResult" resultMap="studentResultMap" parameterType="String">
 		select <include refid="studentColumns"/> from STUDENT where sname like #{sname}
 	</select>	
 	
 	<!-- Dynamic  Sql 使用  if -->
 	<select id="selectStudentByDynamicSql" parameterType="Student" resultType="Student">
 		select * from student 
 		<where>
	 		<if test="sname !=null">
	 			sname like #{sname}
	 		</if>
	 		<if test="sid !=null">
	 			AND sid=#{sid}
	 		</if>
 		</where>
 	</select>
 	
 	<!-- 采用 OGNL 表达式  来配置动态sql 使用trim 去掉 where 中多余的  and 或者 or  where  choose  when otherwise-->
 	<select id="selectStudentByDynamicSqlChoose" parameterType="Student" resultType="Student">
 		select * from student 
 		<trim prefix="WHERE" prefixOverrides="AND | OR ">
 			<choose>
 				<when test=" sname !=null and sname.length() >0 "> 
 					sname like #{sname}
 				</when>
 				<when test="sid !=null and sid>0">
 					AND sid = #{sid}
 				</when>
 				<otherwise>
 					AND status='1'
 				</otherwise>
 			</choose>
 		</trim>
 	</select>
 	
 	<!-- 使用foreach 遍历list  只能小写-->
 	<select id="selectStudentByIds" resultType="Student">
 		select * from student 
 		where sid in
 		<foreach collection="list" item="itm" index="index" open="(" separator="," close=")">
 			#{itm}
 		</foreach>
 	</select>
 	
 	<!-- 使用foreach 遍历arry 只能小写 -->
 	<select id="selectStudentByIdArray" resultType="Student">
 		select * from student 
 		where sid in
 		<foreach collection="array" item="itm" index="index" open="(" separator="," close=")">
 			#{itm}
 		</foreach>
 	</select>
 	
 	<parameterMap type="map" id="procedureParam">
 		<parameter property="sid" javaType="int" jdbcType="NUMERIC" mode="IN" />
 		<parameter property="sname" javaType="String" jdbcType="VARCHAR" mode="IN" />
 		<parameter property="studentList" javaType="ResultSet" jdbcType="CURSOR" mode="OUT" resultMap="studentAllResultMap"/> 
 	</parameterMap>
 	<!--传入map集合参数 ,调用  待用游标存储过程(先执行 修改后然后查询所有)  -->
 	<select id="getAllStudentAfterupdate" statementType="CALLABLE" useCache="true" parameterMap="procedureParam">
 		{call LUOB.pro_getallstudent(?,?,?)}
 	</select>
 	
   
 </mapper>

  


Classes.java
    
package com.mybatis.classes;

import java.sql.Date;
import java.util.List;

import com.mybatis.student.Student;

public class Classes {
	private int cid;
	private String cname;
	private String teacher;
	private Date createDate;

	private List<Student> students;
	//get set 

  


ClassesMapper.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">
 <mapper namespace="com.mybatis.classes">
 	
 	<!-- 设置 缓存共享 -->
 	<cache-ref namespace="com.mybatis.student"/>
 	
 	<resultMap type="Classes" id="classesResultMap">
 		<id column="CID" property="cid"/>
 		<result column="CNAME" property="cname"/>
 		<result column="TEACHER" property="teacher"/>
 		<result column="CREATEDATE" property="createDate"/>
 	</resultMap>
 	
 	<!-- columnPrefix:别名前缀 -->
 	<resultMap type="Classes" id="classesAndStudentListResultMap">
 		<id column="CID" property="cid"/>
 		<result column="CNAME" property="cname"/>
 		<result column="TEACHER" property="teacher"/>
 		<result column="CREATEDATE" property="createDate"/>
 		<collection property="students" ofType="Student" resultMap="com.mybatis.student.studentResultMap" columnPrefix="stu_"/>
 	</resultMap>
 	
 	<!-- 下面采用了 别名 stu_ 来区分列名 -->
 	<select id="selectClassAndStudentListById" resultMap="classesAndStudentListResultMap" parameterType="int">
 		select 
	 		c.cid,
	 		c.cname,
	 		c.teacher,
	 		c.createdate,
	 		s.sid stu_sid,
	 		s.sname stu_sname,
	 		s.score stu_score
 		from student s right join classes c on s.cid=c.cid where c.cid=#{cid}
 	</select>
 	
 </mapper>

  


TestStudentAndClasses.java
    
package com.mybatis.student;

import java.io.IOException;
import java.io.Reader;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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 org.junit.Before;
import org.junit.Test;

import com.mybatis.classes.Classes;


public class TestStudentAndClasses {

	private SqlSessionFactory sqlSessionFactory;
	@Before
	public void init() throws IOException{
		Reader reader = Resources.getResourceAsReader("mybatis-config.xml"); 
		sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); 
	}
	
	/**
	 * 测试新增  手动给 sid
	 */
	@Test
	public void testAddStudent(){
		SqlSession session=sqlSessionFactory.openSession();
		Student student =new Student();
		student.setSid(35);
		student.setSname("Guider");
		student.setScore(100);
		student.setMajor("Games");
		student.setBirth(Date.valueOf("2008-08-08"));
		session.insert("com.mybatis.student.addStudent", student);
		session.commit();
		session.close();
	}
	/**
	 * 测试新增 采用序列 给sid
	 */
	@Test
	public void testAddStudentBySequence(){
		SqlSession session=sqlSessionFactory.openSession();
		Student student =new Student();
		student.setSname("Provdwer");
		student.setScore(100);
		student.setMajor("Games");
		student.setBirth(Date.valueOf("2008-08-08"));
		session.insert("com.mybatis.student.addStudentBySequence", student);
		session.commit();
		session.close();
	}
	
	/**
	 * 测试删除
	 */
	@Test
	public void testDelStudentById(){
		SqlSession session=sqlSessionFactory.openSession();
		session.delete("com.mybatis.student.delStudentById", 12);
		session.commit();
		session.close();
	}
	
	/**
	 * 测试根据 sid更新
	 */
	@Test
	public void testUpdStudentById(){
		SqlSession session=sqlSessionFactory.openSession();
		Student student =new Student();
		student.setSid(0);
		student.setSname("Sandy");
		student.setScore(100);
		student.setMajor("sandy");
		student.setBirth(Date.valueOf("2008-08-08"));
		session.update("com.mybatis.student.addStudentBySequence", student);
		session.commit();
		session.close();
		
	}
	/**
	 * 测试查询所有
	 */
	@Test
	public void testQueryAllStudent(){
		List<Student> stuList=new ArrayList<Student>();
		SqlSession session=sqlSessionFactory.openSession(); 
		stuList=session.selectList("com.mybatis.student.queryAllStudent");
		session.commit();
		session.close();
		for (Student student : stuList) {
			System.out.println(student);
		}
	}
	
	/**
	 * 测试根据 name 模糊查询
	 */
	@Test
	public void testQueryStudentByName(){
		List<Student> stuList=new ArrayList<Student>();
		SqlSession session=sqlSessionFactory.openSession();
		stuList=session.selectList("com.mybatis.student.queryStudentByName","%l%");
		session.commit();
		session.close();
		for (Student student : stuList) {
			System.out.println(student);
		}
	}
	
	/**
	 * 测个根据sid查找一个对象
	 */
	@Test
	public void testQueryStudentById(){
		SqlSession session=sqlSessionFactory.openSession();
		Student student=(Student)session.selectOne("com.mybatis.student.queryStudentById",1);
		session.close();
		System.out.println(student);
	}
	
	/**
	 * 测试 使用resultMap 自定返回值集合
	 */
	@Test
	public void testStudentResultMap(){
		List<Student> stuList=new ArrayList<Student>();
		SqlSession session=sqlSessionFactory.openSession();
		stuList=session.selectList("com.mybatis.student.selectMapResult","%l%");
		session.close();
		for (Student student : stuList) {
			System.out.println(student);
		}
	}
	
	/**
	 * 测试 左连接查  一对一 的 关系
	 */
	@Test
	public void testSelectStudentAndClassBySname(){
		List<Student> stuList=new ArrayList<Student>();
		SqlSession session=sqlSessionFactory.openSession();
		stuList=session.selectList("com.mybatis.student.selectStudentAndClassBySname","luob");
		session.close();
		for (Student student : stuList) {
			System.out.println(student+"//--"+student.getClasses());
		}
	}
	
	/**
	 * 测试 多对一的 关系的 右连接的查询
	 */
	@Test
	public void testSelectClassAndStudentListById(){
		SqlSession session=sqlSessionFactory.openSession();
		Classes classes=(Classes)session.selectOne("com.mybatis.classes.selectClassAndStudentListById",1);
		session.close();
		System.out.println(classes);
		for (Student student : classes.getStudents()) {
			System.out.println(student+"//--"+student.getClasses());
		}
	}
	
	/**
	 * 测试 动态sql 的 应用 where if  ognl
	 */
	@Test
	public void testSelectStudentByDynamicSql(){
		Student pstudent=new Student();
		pstudent.setSid(1);
		List<Student> stuList=new ArrayList<Student>();
		SqlSession session=sqlSessionFactory.openSession();
		stuList=session.selectList("com.mybatis.student.selectStudentByDynamicSql",pstudent);
		session.close();
		for (Student student : stuList) {
			System.out.println(student+"//--"+student.getClasses());
		}
	}
	
	/**
	 * 测试 动态sql 的choose  where when otherwise
	 */
	@Test
	public void testSelectStudentByDynamicSqlChoose(){
		Student pstudent=new Student();
		pstudent.setSid(1);
		//pstudent.setSname("luob");
		List<Student> stuList=new ArrayList<Student>();
		SqlSession session=sqlSessionFactory.openSession();
		stuList=session.selectList("com.mybatis.student.selectStudentByDynamicSqlChoose",pstudent);
		session.close();
		for (Student student : stuList) {
			System.out.println(student+"//--"+student.getClasses());
		}
	}
	
	/**
	 * 测试 动态sql 中foreach 的使用 传入 集合list 参数 
	 */
	@Test
	public void testSelectStudentByIds(){
		ArrayList<Integer> ids=new ArrayList<Integer>();
		ids.add(1);
		ids.add(6);
		ids.add(21);
		ids.add(23);
		List<Student> stuList=new ArrayList<Student>();

		SqlSession session=sqlSessionFactory.openSession();
		stuList=session.selectList("com.mybatis.student.selectStudentByIds",ids);
		session.close();
		for (Student student : stuList) {
			System.out.println(student+"//--"+student.getClasses());
		}
		
	}
	/**
	 * 测试 动态sql 中foreach 的使用 传入 数组array 参数 
	 */
	@Test
	public void testSelectStudentByIdArray(){
		
		List<Student> stuList=new ArrayList<Student>();
		Integer[] idArry=new Integer[]{1,6,21,23};
		SqlSession session=sqlSessionFactory.openSession();
		stuList=session.selectList("com.mybatis.student.selectStudentByIdArray",idArry);
		session.close();
		for (Student student : stuList) {
			System.out.println(student+"//--"+student.getClasses());
		}
		
	}
	
	/**
	 * 测试调用 存储过程   里面有游标哦   返回多个结果 
	 */
	@Test
	public void testGetAllStudentAfterupdate(){
		List<Student> stuList=new ArrayList<Student>();
		Map map = new HashMap();
		map.put("sid", 10);
		map.put("sname", "张翰");
		map.put("studentList",stuList);
		SqlSession session=sqlSessionFactory.openSession();
		
		session.selectOne("com.mybatis.student.getAllStudentAfterupdate",map);
		stuList=(ArrayList<Student>)map.get("studentList");
		for (Student student : stuList) {
			System.out.println(student+"//--"+student.getClasses());
		}
		session.close();
	}
	
	/**
	 * 使用jdbc 测试 游标的创建是否成功 
	 */
	@Test
	public void testJdbcProcedure(){
		
		Connection con=null;
		
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			con=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl","luob","luob");
			CallableStatement cs=con.prepareCall("{call LUOB.pro_getallstudent(?,?,?)}");
			cs.setInt(1, 10);
			cs.setString(2,"张翰");
			//!!! 注意这里 type 在Types中 没有这个类型
			cs.registerOutParameter(3,oracle.jdbc.OracleTypes.CURSOR);
			cs.execute();
			ResultSet rs=(ResultSet)cs.getObject(3);
			while(rs.next()){
				Student student=new Student();
				student.setSid(rs.getInt(1));
				student.setSname(rs.getString(2));
				student.setMajor(rs.getString(3));
				student.setBirth(rs.getDate(4));
				student.setScore(rs.getFloat(5));
				student.setCid(rs.getInt(6));
				student.setStatus(rs.getInt(7));
				System.out.println(student);
			}
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}


  

MyBatis 的简单应用


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