2011年6月iBatis 更名為 MyBatis，從 iBatis 到 MyBatis，不只是名稱上的變化，MyBatis 提供了更為強(qiáng)大的功能，同時(shí)并沒有損失其易用性，相反，在很多地方都借助于 JDK 的泛型和注解特性進(jìn)行了簡化。所以你懂的，開始學(xué)習(xí)就從MyBatis吧．
例子使用MyBatis+Oracle實(shí)現(xiàn)一個(gè)用戶表的查詢，如下：
①數(shù)據(jù)庫 在MySQL中，test數(shù)據(jù)庫下，簡歷user表，字段：iid，ifullname，ipassword，建表語句略。
②需導(dǎo)入的包 只有兩個(gè)： mybatis-3.4.4.jar 和 ojdbc14.jar（JDBC包）
③目錄結(jié)構(gòu) 采用最簡單的結(jié)構(gòu)，com.mybatis包下有且僅有四個(gè)文件 configuration.xml user.xml User.java Test.java
④mybatis配置文件configuration.xml，
[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> <typeAliases> <typeAlias alias="User" type="com.mybatis.User"></typeAlias> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"></transactionManager> <dataSource type="POOLED"> <property name="driver" value="oracle.jdbc.driver.OracleDriver" /> <property name="url" value="jdbc:oracle:thin:@192.168.0.87:1526:entegor" /> <property name="username" value="ideal" /> <property name="password" value="ideal" /> </dataSource> </environment> </environments> <mappers> <mapper resource="user.xml"/> </mappers> </configuration>
User表sql文件User.xml，
[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="User"> <select id="selectUser" parameterType="int" resultType="User"> SELECT * FROM user WHERE id = #{id} </select> <select id="selectUsers" resultType="User"> SELECT * FROM user </select> </mapper>表結(jié)構(gòu)文件User.java
package com.mybatis;public class User { private int iid; private String ifullname; private String iloginname; private String ipassword; public User(){} public User(int id, String name) { this.iid = id; this.ifullname = name; } public String getIfullname() { return ifullname; } public int getIid() { return iid; } public void setIid(int iid) { this.iid = iid; } public void setIfullname(String ifullname) { this.ifullname = ifullname; } public String getIloginname() { return iloginname; } public void setIloginname(String iloginname) { this.iloginname = iloginname; } public String getIpassword() { return ipassword; } public void setIpassword(String ipassword) { this.ipassword = ipassword; }}⑦測試用例Test.java
package com.controller;import java.io.IOException;import java.io.Reader;import java.util.List;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 com.mybatis.User;public class Test { public static void main(String[] args) throws IOException { // TODO Auto-generated method stub String resource = "configuration.xml"; Reader reader = Resources.getResourceAsReader(resource); SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader); SqlSession session = ssf.openSession(); try{ User user = session.selectOne("selectUser", 2); System.out.println(user.getIfullname()); System.out.println(user); System.out.println("--------------分隔線---------------"); List<User> users = session.selectList("selectUsers"); for(int i=0; i<users.size(); i++) { System.out.println(users.get(i).getIfullname()); } } catch (Exception e) { e.printStackTrace(); } finally { session.close(); } }}新聞熱點(diǎn)
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