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新建項目（我應用的是maven項目）mybatis-study-01
1、參加mybatis與mysql-connector依附包到pom文件
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>mybatis</groupId> <artifactId>mybatis-study-01</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>mybatis-01</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> <scope>test</scope> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.3</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.27</version> </dependency> </dependencies> </project>
2、創立數據庫mybatis-test
新建一張user表用於測試。建表sql以下：
CREATE TABLE `user` ( `id` int(11) NOT NULL auto_increment, `password` varchar(255) default NULL, `user_name` varchar(50) default NULL, `user_age` int(11) default NULL, `user_address` varchar(200) default NULL, PRIMARY KEY (`id`), UNIQUE KEY `userName` (`user_name`) ) EN
拔出一條數據
INSERT INTO `user` VALUES ('1', '123131', 'summer', '100', 'shanghai,pudong');
3、在項目中編寫pojo對象。
package com.zf.mybatis.pojo;
public class User {
private int id;
private String password ;
private String userName;
private String userAge;
private String userAddress;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserAge() {
return userAge;
}
public void setUserAge(String userAge) {
this.userAge = userAge;
}
public String getUserAddress() {
return userAddress;
}
public void setUserAddress(String userAddress) {
this.userAddress = userAddress;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
4、編寫pojo對應的映照文件User.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.zf.mybatis.pojo.UserMapper">
<!-- 應用sql標簽可以將公共的sql提掏出來復用 -->
<sql id="queryFields">
id , password , user_name as userName , user_age as userAge , user_address as userAddress
</sql>
<select id="selectByID" parameterType="int" resultType="User">
select
<include refid="queryFields"/>
from `user` where id = #{id}
</select>
<insert id="add" parameterType="User" useGeneratedKeys="true" keyProperty="id" >
insert into `user`
(password , user_name , user_age , user_address)
values(#{password} , #{userName} , #{userAge} , #{userAddress} )
</insert>
<update id="update" parameterType="User" >
update `user`
set password = #{password} , user_name = #{userName}, user_age = #{userAge}, user_address = #{userAddress}
where id = #{id}
</update>
<delete id="deleteById" parameterType="int">
delete from `user` where id = #{id}
</delete>
</mapper>
留意：下面的namespace的值為com.zf.mybatis.pojo.UserMapper，可以自界說 ，UserMapper不是一個類，不須要存在的。
別的，mybatis會將從數據庫查詢出來的記載依據列名與pojo中的字段停止婚配， 所以下面的user_name，user_age ,user_address這幾個字段都取了別號，跟pojo中的字段絕對應。 假如不起別號， 查詢出來的對象，這幾個字段是沒有值的。
5、編寫mybatis的設置裝備擺設文件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> <!-- 設置裝備擺設別號 --> <typeAliases> <typeAlias alias="User" type="com.zf.mybatis.pojo.User"/> </typeAliases> <!-- 數據庫設置裝備擺設信息 --> <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://127.0.0.1:3306/mybatis-test"/> <property name="username" value="root"/> <property name="password" value="root"/> </dataSource> </environment> </environments> <!-- 映照文件 --> <mappers> <mapper resource="conf/User.xml"/> </mappers> </configuration>
在該設置裝備擺設文件中設置裝備擺設了數據庫的鏈接方法，和注冊一切的映照文件，還可以設置mybatis的一些參數。
如今便可以編寫測試類了。來測試一下。
package com.zf.mybatis;
import java.io.IOException;
import java.io.Reader;
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.zf.mybatis.pojo.User;
public class TestMyBatis {
private SqlSessionFactory sqlSessionFactory;
private Reader reader;
@Before
public void init(){
try {
reader = Resources.getResourceAsReader("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (IOException e) {
e.printStackTrace();
}
}
@Test
public void testQueryUser(){
SqlSession session = sqlSessionFactory.openSession();
try {
User user = (User) session.selectOne("com.zf.mybatis.pojo.UserMapper.selectByID" ,1);
System.out.println(user.getUserAddress());
System.out.println(user.getUserName());
} finally {
session.close();
}
}
@Test
public void testInsertUser(){
SqlSession session = sqlSessionFactory.openSession();
try {
User user = new User() ;
user.setUserName("abcde");
user.setUserAge(15) ;
user.setUserAddress("hangzhou/zhejiang");
user.setPassword("123456");
//前往值是記載條數
int resultCount = session.insert("com.zf.mybatis.pojo.UserMapper.add", user );
session.commit() ;
System.out.printf("userID:%d,總記載條數:%d" , user.getId() , resultCount); //獲得拔出對象的id
} finally {
session.close();
}
}
@Test
public void testUpdateUser(){
SqlSession session = sqlSessionFactory.openSession();
try {
User user = new User() ;
user.setId(5) ;
user.setUserName("updateName");
user.setUserAge(101) ;
user.setUserAddress("shenzhen/guangdong");
user.setPassword("000000");
//前往值是修正條數
int updateCount = session.update("com.zf.mybatis.pojo.UserMapper.update", user );
session.commit() ;
System.out.printf("修正條數:%d" ,updateCount);
} finally {
session.close();
}
}
@Test
public void testDelete(){
SqlSession session = sqlSessionFactory.openSession();
try {
//前往值是刪除條數
int deleteCount = session.update("com.zf.mybatis.pojo.UserMapper.deleteById", 4 );
session.commit() ;
System.out.printf("刪除條數:%d" ,deleteCount );
} finally {
session.close();
}
}
}
運轉testQueryUser成果以下：
shanghai,pudong summer
到此，一個mybatis的helloworld類型的小法式就出來了。
PS：MyBaits設置裝備擺設文件報錯處理
Mybaits的設置裝備擺設文件校驗很詭異，節點的地位還有請求
以下，會報錯：
The content of element type "configuration" must match "(properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,plugins?,environments?,mappers?)".
<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@xx:1521:xx"/>
<property name="username" value="ireport"/>
<property name="password" value="xxxx"/>
</dataSource>
</environment>
</environments>
<typeAliases>
<typeAlias type="com.ice.stat.online.model.EventFlag" alias="EventFlag"/>
</typeAliases>
<mappers>
<mapper resource="com/ice/stat/online/model/hbm/EventFlagMapper.xml"/>
</mappers>
</configuration>
把typeAliases放到最下面就行了說：
<?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>
<typeAliases>
<typeAlias type="com.ice.stat.online.model.EventFlag" alias="EventFlag"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@xx:1521:xx"/>
<property name="username" value="ireport"/>
<property name="password" value="xxxx"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/ice/stat/online/model/hbm/EventFlagMapper.xml"/>
</mappers>
</configuration>
