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一个简单的例子
我对MyBatis的理解仅仅是：它以前叫IBtais，现在投到谷歌帐下，改名MyBatis，这个框架把JDBC中的重复代码封装起来，减少代码量。仅仅知道这些而已，慢慢学习吧，从网上找了一个最简单的例子。
MyBatis+MySQL的，记录如下：
①数据库
在MySQL中，test数据库下，简历user表，一共两个字段id和name，建表语句略。
②需导入的包
只有两个：
mybatis-3.0.3.jar
mysql-connector-java-5.1.9-bin.jar（JDBC包）
③目录结构
采用最简单的结构，domain包下有且仅有四个文件
configuration.xml
User.xml
User.java
Test.java
④实体类javabean，总共两个变量
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01.package domain;
02.
03.public class User {
04. private int id;
05. private String name = null;
06. public User() {
07. }
08. public User(int id, String name) {
09. this.id = id;
10. this.name = name;
11. }
12. public int getId() {
13. return id;
14. }
15. public void setId(int id) {
16. this.id = id;
17. }
18. public String getName() {
19. return name;
20. }
21. public void setName(String name) {
22. this.name = name;
23. }
24. @Override
25. public String toString() {
26. return "User [id=" + id + ", name=" + name + "]";
27. }
28.}
package domain;
public class User {
private int id;
private String name = null;
public User() {
}
public User(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + "]";
}
}
⑤MyBatis总配置文件configuration.xml
view plaincopy to clipboardprint? 01.<?xml version="1.0" encoding="UTF-8" ?> 02.<!DOCTYPE configuration PUBLIC 03. "-//mybatis.org//DTD Config 3.0//EN" 04. " http://mybatis.org/dtd/mybatis-3-config.dtd"> 05.<configuration> 06. <typeAliases> 07. <typeAlias alias="User" type="domain.User" /> 08. </typeAliases> 09. <environments default="development"> 10. <environment id="development"> 11. <transactionManager type="JDBC" /> 12. <dataSource type="POOLED"> 13. <property name="driver" value="com.mysql.jdbc.Driver" /> 14. <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8" /> 15. <property name="username" value="root" /> 16. <property name="password" value="" /> 17. </dataSource> 18. </environment> 19. </environments> 20. <mappers> 21. <mapper resource="domain/User.xml" /> 22. </mappers> 23.</configuration> <?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="domain.User" /> </typeAliases> <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://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8" /> <property name="username" value="root" /> <property name="password" value="" /> </dataSource> </environment> </environments> <mappers> <mapper resource="domain/User.xml" /> </mappers> </configuration>
⑥User类的配置文件User.xml
view plaincopy to clipboardprint? 01.<?xml version="1.0" encoding="UTF-8" ?> 02.<!DOCTYPE mapper PUBLIC 03. "-//mybatis.org//DTD Mapper 3.0//EN" 04. " http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 05.<mapper namespace="User"> 06. <select id="selectUser" parameterType="int" resultType="User"><!--[CDATA[ 07. select * from user where id = #{id} 08. ]]--></select> 09.</mapper> <?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"><!--[CDATA[ select * from user where id = #{id} ]]--></select> </mapper> ⑦测试用例
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01.package domain;
02.
03.import java.io.IOException;
04.import java.io.Reader;
05.import org.apache.ibatis.io.Resources;
06.import org.apache.ibatis.session.SqlSession;
07.import org.apache.ibatis.session.SqlSessionFactory;
08.import org.apache.ibatis.session.SqlSessionFactoryBuilder;
09.import domain.User;
10.
11.public class Test {
12. public static void main(String[] args) throws IOException {
13. String resource = "domain/configuration.xml";
14. Reader reader = Resources.getResourceAsReader(resource);
15. SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);
16. SqlSession session = ssf.openSession();
17. try {
18. User user = (User) session.selectOne("selectUser", "1");
19. System.out.println(user);
20. } catch (Exception e) {
21. e.printStackTrace();
22. } finally {
23. session.close();
24. }
25. }
26.}
package domain;
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 domain.User;
public class Test {
public static void main(String[] args) throws IOException {
String resource = "domain/configuration.xml";
Reader reader = Resources.getResourceAsReader(resource);
SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);
SqlSession session = ssf.openSession();
try {
User user = (User) session.selectOne("selectUser", "1");
System.out.println(user);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
}
}
}
以上，MyEclipse 8.5下编译通过
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发表于 2011-12-19 14:02