Mybatis使用篇之二:HelloWorld
1. 搭建开发环境
(1)新建一个Web工程,名称为MybatisFramework。
(2)将以下的JAR放到Web工程的lib下面:
- mybatis-3.0.6.jar
- og4j-1.2.16.jar
- classes12.jar
mybatis-3.0.6.jar og4j-1.2.16.jar classes12.jar
(3)在src下面新建log4j.properties文件,该文件的内容如下:
- log4j.appender.stdout=org.apache.log4j.ConsoleAppender
- log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
- log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] -%m%n
- log4j.logger.com.ibatis=debug
- log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug
- log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug
- log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug
- log4j.logger.java.sql.Connection=debug
- log4j.logger.java.sql.Statement=debug
- log4j.logger.java.sql.PreparedStatement=debug,stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] -%m%n log4j.logger.com.ibatis=debug log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug log4j.logger.java.sql.Connection=debug log4j.logger.java.sql.Statement=debug log4j.logger.java.sql.PreparedStatement=debug,stdout
(4)在src下面新建mybatis.cfg.xml文件,该文件的内容如下:
- <?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.OracleDriver" />
- <property name="url" value="jdbc:oracle:thin:@localhost:1521:SID" />
- <property name="username" value="xxxx" />
- <property name="password" value="xxxx" />
- </dataSource>
- </environment>
- </environments>
- </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> <environments default="development"> <environment id="development"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driver" value="oracle.jdbc.OracleDriver" /> <property name="url" value="jdbc:oracle:thin:@localhost:1521:SID" /> <property name="username" value="xxxx" /> <property name="password" value="xxxx" /> </dataSource> </environment> </environments> </configuration>
2. 入门示例
(1)在Oracle数据库执行以下SQL,创建一个USER_INFO的表:
- -- Create table
- create table USER_INFO
- (
- ID NUMBER(12) not null,
- NAME VARCHAR2(50)
- );
- --Insert data
- insert into USER_INFO(ID,NAME) values(1,'张三');
-- Create table create table USER_INFO ( ID NUMBER(12) not null, NAME VARCHAR2(50) ); --Insert data insert into USER_INFO(ID,NAME) values(1,'张三');
(2)新建一个Java类UserInfo.java,该类的内容如下:
- package com.user;
- public class UserInfo {
- private int id;
- private String name;
- public UserInfo() {
- }
- public UserInfo(String name) {
- this(0, name);
- }
- public UserInfo(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 "ID: " + id + ", Name: " + name;
- }
- }
package com.user; public class UserInfo { private int id; private String name; public UserInfo() { } public UserInfo(String name) { this(0, name); } public UserInfo(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 "ID: " + id + ", Name: " + name; } }
(3)在com.user.sqlmap下面新建UserInfo.xml文件,该文件的内容如下:
- <?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="UserInfo">
- <![CDATA[
- select * from user_info where id = #{id}
- ]]>
- </select>
- </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="UserInfo"> <![CDATA[ select * from user_info where id = #{id} ]]> </select> </mapper>
(4)将UserInfo.xml引用到mybatis.cfg.xml文件中,mybatis.cfg.xml文件更新后的内容如下:
- <?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="UserInfo" type="com.user.UserInfo" />
- </typeAliases>
- <environments default="development">
- <environment id="development">
- <transactionManager type="JDBC" />
- <dataSource type="POOLED">
- <property name="driver" value="oracle.jdbc.OracleDriver" />
- <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORACLEDB" />
- <property name="username" value="oracle" />
- <property name="password" value="oracle" />
- </dataSource>
- </environment>
- </environments>
- <mappers>
- <mapper resource="com/user/sqlmap/UserInfo.xml" />
- </mappers>
- </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="UserInfo" type="com.user.UserInfo" /> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC" /> <dataSource type="POOLED"> <property name="driver" value="oracle.jdbc.OracleDriver" /> <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORACLEDB" /> <property name="username" value="oracle" /> <property name="password" value="oracle" /> </dataSource> </environment> </environments> <mappers> <mapper resource="com/user/sqlmap/UserInfo.xml" /> </mappers> </configuration>
(5)新建一个测试Java类UserInfoTest.java,该类的具体内容如下:
- package com.user;
- 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;
- public class UserInfoTest {
- /**
- * @param args
- * @throws IOException
- */
- public static void main(String[] args) throws IOException {
- String resource = "mybatis.cfg.xml";
- Reader reader = Resources.getResourceAsReader(resource);
- SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader);
- SqlSession session = ssf.openSession();
- try {
- UserInfo user = (UserInfo) session.selectOne("User.selectUser", "1");
- System.out.println(user);
- } catch (Exception e) {
- e.printStackTrace();
- } finally {
- session.close();
- }
- }
- }
package com.user; 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; public class UserInfoTest { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { String resource = "mybatis.cfg.xml"; Reader reader = Resources.getResourceAsReader(resource); SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(reader); SqlSession session = ssf.openSession(); try { UserInfo user = (UserInfo) session.selectOne("User.selectUser", "1"); System.out.println(user); } catch (Exception e) { e.printStackTrace(); } finally { session.close(); } } }
(6)右键UserInfoTest 类,选择Run As Application,运行MyBaits操作数据库。
- log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
- log4j:WARN Please initialize the log4j system properly.
- log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
- 2012-02-11 21:44:01,750 DEBUG [java.sql.PreparedStatement] -==> Executing: select * from user_info where id = ?
- 2012-02-11 21:44:01,781 DEBUG [java.sql.PreparedStatement] -==> Parameters: 1(String)
- ID: 1, Name: 张三
log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. 2012-02-11 21:44:01,750 DEBUG [java.sql.PreparedStatement] -==> Executing: select * from user_info where id = ? 2012-02-11 21:44:01,781 DEBUG [java.sql.PreparedStatement] -==> Parameters: 1(String) ID: 1, Name: 张三