MyBatis 的简单应用(转载)

MyBatis 的简单应用

博客分类：
MyBatis

MyBatis.callresultMapdynamic sql

在做测试的时候本来加入oscache ,但是在使用的时候 ,发下初始化异常,不知道需要注意那些地方, 希望 "da xia " 们留言谢谢!!!!

介绍

Java代码

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

MyBatis-config.xml 中 set 的说明 []: 表示可能的不太正确

Xml代码

<settings>
<setting name="cacheEnabled" value="true"/>
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="aggressiveLazyLoading" value="true"/>
<setting name="multipleResultSetsEnabled" value="true"/>
<setting name="useColumnLabel" value="true"/>
<setting name="useGeneratedKeys" value="false"/>
<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"/>
<setting name="defaultStatementTimeout" value="25000"/>
<setting name="safeRowBoundsEnabled" value="false"/>
<setting name="mapUnderscoreToCamelCase" value="false"/>
<setting name="localCacheScope" value="SESSION"/>
<setting name="jdbcTypeForNull" value="OTHER"/>
<setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/>
</settings>

表,序列 ,存储过程的创建

存储过程

Java代码

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

Java代码

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

Java代码

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

学生表

Java代码

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

Java代码

-- 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代码

<?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 -->
<properties resource="mybatis-config.properties">
<!--
<property name="username" value="admin"/>
<property name="password" value="123456"/>
-->
</properties>
<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

Xml代码

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

Student.java

Java代码

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代码

<?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* )+> -->
<cache eviction="FIFO" readOnly="true" size="256" flushInterval="60000"/>
<sql id="studentColumns">sid,sname,score</sql>
<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>
<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>
<select id="queryStudentByName" resultType="Student" parameterType="String">
select * from student where sname like #{property,javaType=String,jdbcType=VARCHAR}
</select>
<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>
<select id="selectMapResult" resultMap="studentResultMap" parameterType="String">
select <include refid="studentColumns"/> from STUDENT where sname like #{sname}
</select>
<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>
<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>
<select id="selectStudentByIds" resultType="Student">
select * from student
where sid in
<foreach collection="list" item="itm" index="index" open="(" separator="," close=")">
#{itm}
</foreach>
</select>
<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>
<select id="getAllStudentAfterupdate" statementType="CALLABLE" useCache="true" parameterMap="procedureParam">
{call LUOB.pro_getallstudent(?,?,?)}
</select>
</mapper>

Classes.java

Java代码

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代码

<?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">
<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>
<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>
<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

Java代码

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();
}
}
}

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MyBatis 的简单应用(转载)

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