最近写一个web服务接口,用到了MyBatis3.2,把我配置的过程及自己的一些做法供大家参考,希望能帮助到刚入手MyBatis的人;(如果您阅读文章时发现问题的,希望能留言指出)
首先导入mybatis-3.2.3.jar包 还有连接数据库的驱动包,我用的是Sqls2005 所以导入sqljdbc.jar
工程中必须导入的三个包(对应的包附件中可以下载):
class="xml">#sqlserver connection driver=com.microsoft.sqlserver.jdbc.SQLServerDriver url=jdbc:sqlserver://192.168.1.31:1433; DatabaseName=dataBaseName username=sa password=sa
<?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"> <!-- 注意:每个标签必须按顺序写,不然蛋疼的DTD会提示错误:The content of element type "configuration" must match "(properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,plugins?,environments?,mappers?)". --> <configuration> <!-- 属性配置 --> <properties resource="com/mybatis/config/sqlserver-jdbc-connection.properties"> <!-- 相同属性:最高优先级的属性是那些作为方法参数的,然后是资源/url 属性,最后是 properties元素中指定的属性 --> <!-- <property name="username" value="sa"/> --> <!-- <property name="password" value="phoenix"/> --> </properties> <!-- 设置缓存和延迟加载等等重要的运行时的行为方式 --> <settings> <!-- 设置超时时间,它决定驱动等待一个数据库响应的时间 --> <setting name="defaultStatementTimeout" value="25000"/> <!-- 这个配置使全局的映射器启用或禁用缓存 --> <setting name="cacheEnabled" value="true"/> <!-- 全局启用或禁用延迟加载。当禁用时,所有关联对象都会即时加载 --> <!-- <setting name="lazyLoadingEnabled" value="true"/> --> <!-- 当启用时,有延迟加载属性的对象在被调用时将会完全加载任意属性。否则,每种属性将会按需要加载 --> <setting name="aggressiveLazyLoading" value="true"/> <!-- 允许或不允许多种结果集从一个单独的语句中返回(需要适合的驱动) --> <setting name="multipleResultSetsEnabled" value="true"/> <!-- 使用列标签代替列名。不同的驱动在这方便表现不同。参考驱动文档或充分测试两种方法来决定所使用的驱动 --> <setting name="useColumnLabel" value="true"/> <!-- 允许JDBC支持生成的键。需要适合的驱动。如果设置为true则这个设置强制生成的键被使用,尽管一些驱动拒绝兼容但仍然有效(比如Derby) --> <setting name="useGeneratedKeys" value="false"/> <!-- 指定MyBatis如何自动映射列到字段/属性。PARTIAL只会自动映射简单,没有嵌套的结果。FULL会自动映射任意复杂的结果(嵌套的或其他情况) --> <setting name="autoMappingBehavior" value="PARTIAL"/> <!-- 配置默认的执行器。SIMPLE执行器没有什么特别之处。REUSE执行器重用预处理语句。BATCH执行器重用语句和批量更新 --> <setting name="defaultExecutorType" value="SIMPLE"/> </settings> <!-- 别名 --> <typeAliases> <!-- 用户bean-用户登录时映射使用 --> <typeAlias alias="UserBean" type="com.restservice.bean.UserBean"/> <environments default="development"> <!-- environment 元素体中包含对事务管理和连接池的环境配置 --> <environment id="development"> <transactionManager type="JDBC" /> <!-- type分三种: UNPOOLED是每次被请求时简单打开和关闭连接 UNPOOLED的数据源仅仅用来配置以下 4 种属性driver,url,username,password POOLED :JDBC连接对象的数据源连接池的实现,不直接支持第三方数据库连接池 --> <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> <!-- ORM映射文件 --> <mappers> <!-- 用户测试XML --> <mapper resource="com/restservice/bean/UserBean.xml" /> </mappers> </configuration>
贴一下xml代码,需要自己写一下bean哦,(不会可以留言。
)
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper???? PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"???? "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">???? ?? <!-- namespace用于java代码调用时识别指定xml的mapper文件 --> <mapper namespace="userinfo"> ?<!-- 开启Mabatis二级缓存 --> ?<cache/> ?<!-- 配置ORM映射 --> ?<resultMap type="UserInfo" id="user_orm"> ??<id property="id" column="id"/> ??<result property="code" column="code"/> ??<result property="name" column="name"/> ??<result property="sex" column="sex"/> ??<result property="phone" column="phone"/> ??<result property="money" column="money"/> ?</resultMap> ? ?<!-- 用来定义可重用的SQL代码段 --> ?<sql id="demo_sql"> ??code,name,sex,phone,money ?</sql> ? ?<insert id="inser_userInfo" parameterType="UserInfo"> ??<!-- include 引用可重用的SQL代码段 --> ??INSERT INTO USERINFO(<include refid="demo_sql"/>) VALUES(#{code},#{name},#{sex},#{phone},#{money}) ?</insert> ? ?<update id="update_userInfo" parameterType="UserInfo"> ??UPDATE USERINFO SET code=#{code} ,name=#{name} ,sex=#{sex} ,phone=#{phone} ,money=#{money} WHERE id=#{id} ?</update> ? ??? <select id="selectAll_userInfo"? resultMap="user_orm"> ??? ?SELECT * FROM USERINFO ? ?</select> ? ? ? ?<select id="selectById_userInfo" parameterType="int" resultType="UserInfo"> ??? ?SELECT * FROM USERINFO WHERE id= #{id} ? ?</select> </mapper>?
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<select id="findWellsInfo" useCache="false" flushCache="true" resultType="hashmap"> SELECT ID AS FIELDCODE,NAME AS DATACATEGORYNAME,'' COLOR FROM IMS_WELL WHERE ID IN <foreach item="wellIds" index="index" collection="wellIds" open="(" separator="," close=")"> #{wellIds} </foreach> </select>
我这里传入的参数是一个map ,map中有一个参数是数组wellIds,所以我写成collection="wellIds";
可以直接传入数组,写法:只需要把collection="wellIds"改成collection="array";
也可以传入List ,写法:只需要把collection="wellIds"改成collection="list";
?还有很多特殊情况就不一一举例了,具体请详细阅读附件MyBatis3.2中文API
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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.apache.log4j.Logger;
/**
*
* MyBatis会话工厂类.
*
* @version 1.0 2013-12-1
* @author xqwu
*/
public class SessionFactoryUtil {
protected static final Logger log = Logger.getLogger(SessionFactoryUtil.class);
//MyBatis配置路径
private static final String RESOURCE = "com/mybatis/config/Configuration.xml";
//sql会话工厂
private static SqlSessionFactory sqlSessionFactory = null;
//所有sqlSession
private static ThreadLocal<SqlSession> threadLocal = new ThreadLocal<SqlSession>();
/**
* 静态代码块 用于获得sqlSessionFactory
* 不执行 由SessionFactoryListener调用初始化方法
*/
/*static {
Reader reader = null;
try {
reader = Resources.getResourceAsReader(RESOURCE);
} catch (IOException ioex) {
throw new RuntimeException("Get resource error:"+RESOURCE, ioex);
}
//获得sqlSessionFactory
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
}*/
/**
*
* 获得SqlSessionFactory
* @author xqwu
* @date 2013-12-1 下午2:08:59
*
* @return
*/
public static SqlSessionFactory getSqlSessionFactory(){
return sqlSessionFactory;
}
/**
*
* 初始化SqlSessionFactory.
* @author xqwu
* @date 2013-12-1 下午2:08:39
*
*/
public static void initSqlSessionFactory() throws RuntimeException,Exception{
try {
if(sqlSessionFactory == null){
Reader reader = Resources.getResourceAsReader(RESOURCE);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
log.debug("init sqlSessionFactory success");
}
} catch (IOException ioex) {
throw new RuntimeException("Get resource error:"+RESOURCE, ioex);
}
}
/**
*
* 获取sqlSession.
* @author xqwu
* @date 2013-12-1 上午11:27:38
*
* @return
*/
public static SqlSession getSession(){
SqlSession sqlsession = threadLocal.get();
if(sqlsession!=null){
if(sqlSessionFactory == null){
getSqlSessionFactory();
}
//如果sqlSessionFactory不为空则获取sqlSession,否则返回null
sqlsession = (sqlSessionFactory!=null) ? sqlSessionFactory.openSession(): null;
}
return sqlsession;
}
/**
*
* 关闭sqlSession
* @author xqwu
* @date 2013-12-1 上午11:26:23
*
*/
public static void closeSqlSession() throws Exception{
//获得sqlsession
SqlSession sqlsession = threadLocal.get();
threadLocal.set(null);
if(sqlsession!=null){//验证关闭sqlsession
sqlsession.close();
log.debug("close sqlsession success");
}
log.debug("sqlsession is null");
}
}
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import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import org.apache.log4j.Logger; import com.opro.ims.i.restservice.utils.SessionFactoryUtil; /** * Class description goes here. * * @version 1.0 2013-12-6 * @author xqwu */ public class SessionFactoryListener implements ServletContextListener { protected static final Logger log = Logger.getLogger(SessionFactoryListener.class); /* (non-Javadoc) * <p>Title: contextDestroyed</p> * <p>Description: </p> * @param arg0 * 当Servlet 容器终止Web 应用时调用该方法。在调用该方法之前,容器会先销毁所有的Servlet 和Filter 过滤器。 * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent) */ @Override public void contextDestroyed(ServletContextEvent arg0) { try { SessionFactoryUtil.closeSqlSession(); } catch (Exception ex) { log.error(ex.getMessage()); } } /* (non-Javadoc) * <p>Title: contextInitialized</p> * 当Servlet 容器启动Web 应用时调用该方法。在调用完该方法之后,容器再对Filter 初始化, * 并且对那些在Web 应用启动时就需要被初始化的Servlet 进行初始化。 * @param arg0 * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent) */ @Override public void contextInitialized(ServletContextEvent arg0) { try { SessionFactoryUtil.initSqlSessionFactory(); } catch (RuntimeException rex) { log.error(rex.getMessage()); } catch (Exception ex) { log.error(ex.getMessage()); } } }
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<!-- 初始化SessionFactory监听器 --> <listener> <listener-class>com.opro.ims.i.restservice.listener.SessionFactoryListener</listener-class> </listener>
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import java.sql.SQLException;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.type.TypeException;
/**
* Class description goes here.
*
* @version 1.0 2013-11-29
* @author xqwu
*/
public interface BaseDao {
/**
*
* 获得sqlSession对象.
* @author xqwu
* @date 2013-11-29 下午4:17:11
*
* @return
*/
public SqlSession getSqlSession() throws TypeException,SQLException,Exception;
/**
*
* 插入数据.
* @author xqwu
* @date 2013-12-6 上午09:56:00
*
* @param s
* @param obj
* @throws TypeException
* @throws SQLException
* @throws Exception
*/
public void insert(String s, Object obj) throws TypeException,SQLException,Exception;
/**
*
* 查询所有数据.
* @author xqwu
* @date 2013-11-29 下午3:52:21
*
* @return
*/
public List<?> findAll(String s, Object obj) throws TypeException,SQLException,Exception;
/**
*
* 查询指定页数大小.
* @author xqwu
* @date 2013-11-29 下午3:54:06
*
* @param s namespace用于java代码调用时识别指定xml的mapper文件
* @param pageNo 页码
* @param pageSize 大小
* @return
*/
public List<?> findList(String s, Object obj, int pageNo, int pageSize) throws TypeException,SQLException,Exception;
/**
*
* 查询返回对象.
* @author xqwu
* @date 2013-12-2 下午02:58:41
*
* @param s
* @param param
* @return
*/
public Object selectOne(String s, Object param) throws TypeException,SQLException,Exception;
/**
*
* 更新数据方法.
* @author xqwu
* @date 2013-12-4 下午05:59:16
*
* @param s
* @param param
* @throws TypeException
* @throws SQLException
* @throws Exception
*/
public void update(String s, Object param) throws TypeException,SQLException,Exception;
}
import java.sql.SQLException;
import java.util.List;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.type.TypeException;
import com.opro.ims.i.restservice.core.BaseDao;
import com.opro.ims.i.restservice.utils.SessionFactoryUtil;
/**
* Dao基类,所有Dao都继承该类.
*
* @version 1.0 2013-11-29
* @author xqwu
*/
public class BaseDaoImpl implements BaseDao{
@Override
public SqlSession getSqlSession() throws TypeException,SQLException,Exception {
// TODO Auto-generated method stub
return SessionFactoryUtil.getSqlSessionFactory().openSession();
}
@Override
public List<?> findAll(String s, Object obj) throws TypeException,SQLException,Exception {
// TODO Auto-generated method stub
SqlSession session = getSqlSession();
try{
List list = session.selectList(s, obj);
return list;
} finally{
session.close();
}
}
@Override
public List<?> findList(String s, Object obj, int pageNo, int pageSize) throws TypeException,SQLException,Exception {
// TODO Auto-generated method stub
SqlSession session = getSqlSession();
try{
List list = session.selectList(s, obj, new RowBounds((pageNo-1)*pageSize, pageSize));
return list;
} finally{
session.close();
}
}
@Override
public Object selectOne(String s, Object param) throws TypeException,SQLException,Exception {
// TODO Auto-generated method stub
SqlSession session = getSqlSession();
try{
Object object = session.selectOne(s, param);
return object;
} finally{
session.close();
}
}
@Override
public void update(String s, Object param) throws TypeException,SQLException, Exception {
// TODO Auto-generated method stub
SqlSession session = getSqlSession();
try{
session.update(s, param);
session.commit();
} finally{
session.close();
}
}
/* (non-Javadoc)
* <p>Title: insert</p>
* <p>Description: </p>
* @param s
* @param obj
* @throws TypeException
* @throws SQLException
* @throws Exception
* @see com.opro.ims.i.restservice.core.BaseDao#insert(java.lang.String, java.lang.Object)
*/
@Override
public void insert(String s, Object param) throws TypeException, SQLException, Exception {
// TODO Auto-generated method stub
SqlSession session = getSqlSession();
try{
session.insert(s, param);
session.commit();
} finally{
session.close();
}
}
}
继承BaseDaoImpl后,写法就如此简单了
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import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.type.TypeException;
import com.opro.ims.i.restservice.core.impl.BaseDaoImpl;
/**
* 检索报警数据Dao.
*
* @version 1.0 2013-12-5
* @author xqwu
*/
public class RetrieveWarningsDao extends BaseDaoImpl{
@SuppressWarnings("unchecked")
public List retrieveWarnings(Map param, int pageNo, int pageSize) throws TypeException,SQLException,Exception{
return findList("retrievewarnings.retrieveWarnings", param, pageNo, pageSize);
}
}
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最后我把对应的MyBatis中文API分享给大家。
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