做web應用的在客戶現場經常碰到這樣的拓撲結構:
這是一種典型的環境搭建模式.
這是我有一種需求,需要在客戶端CLIENT1機器上做一個客戶端小應用程序,這個程序需要訪問數據庫(DB SERVER),
這裏我是用Ibatis實現的數據訪問層,其訪問數據庫的方式有下面兩種:
一.直連數據庫(jdbc)
SqlMapConfig.xml:
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE sqlMapConfig PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN" "http://www.ibatis.com/dtd/sql-map-config-2.dtd"><sqlMapConfig> <properties resource="SqlMapConfig.properties" /> <settings cacheModelsEnabled="true" enhancementEnabled="false" lazyLoadingEnabled="true" maxRequests="20" maxSessions="10" maxTransactions="15" useStatementNamespaces="false" /> <transactionManager type="JDBC"> <dataSource type="SIMPLE"> <property name="JDBC.Driver" value="${driver}" /> <property name="JDBC.ConnectionURL" value="${url}" /> <property name="JDBC.Username" value="${username}" /> <property name="JDBC.Password" value="${password}" /> </dataSource> </transactionManager> <!-- ========================================================== All SQL Map XML files to be loaded by this SQL map. Notice the paths are relative to the classpath. ========================================================== --> <sqlMap resource="sqlmap-oracle/test.xml" /></sqlMapConfig> SqlMapConfig.properties:
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@192.168.0.197:1521:TEST
username=TEST
password=TestJNDI
通過這樣連接沒有問題,但是有一點,數據庫的信息全部暴露在客戶端了,無形之中增加了一定的安全隱患,客戶一般也是不允許的.
如果CLIENT1客戶端有專人管理,可能沒問題,這裏我主要介紹一下通過JNDI連接Web Server間接的訪問數據庫的方式.
二.通過JNDI連數據庫
SqlMapConfig.xml:
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE sqlMapConfig PUBLIC "-//iBATIS.com//DTD SQL Map Config 2.0//EN" "http://www.ibatis.com/dtd/sql-map-config-2.dtd"><sqlMapConfig> <settings cacheModelsEnabled="true" enhancementEnabled="false" lazyLoadingEnabled="true" maxRequests="20" maxSessions="10" maxTransactions="15" useStatementNamespaces="false" /> <transactionManager type="JDBC"> <dataSource type="JNDI"> <property name="context.java.naming.factory.initial" value="weblogic.jndi.WLInitialContextFactory"/> <property name="context.java.naming.provider.url" value="t3://192.168.0.197:7001"/> <property name="DataSource" value="jndi/ibatis/oraJNDI"/> </dataSource> </transactionManager> <!-- ========================================================== All SQL Map XML files to be loaded by this SQL map. Notice the paths are relative to the classpath. ========================================================== --> <sqlMap resource="sqlmap-oracle/test.xml" /></sqlMapConfig><property name="context.java.naming.factory.initial" value="weblogic.jndi.WLInitialContextFactory"/><property name="context.java.naming.provider.url" value="t3://192.168.0.197:7001"/>java.lang.RuntimeException: Error occurred. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: There was an error configuring JndiDataSourceDaoTransactionPool. Cause: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:84) at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:62) at com.nstc.greport.ibatis.TestSupport.setUp(TestSupport.java:29) at junit.framework.TestCase.runBare(TestCase.java:125) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at junit.framework.TestSuite.runTest(TestSuite.java:208) at junit.framework.TestSuite.run(TestSuite.java:203) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: There was an error configuring JndiDataSourceDaoTransactionPool. Cause: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:52) at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:81) ... 12 moreCaused by: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: There was an error configuring JndiDataSourceDaoTransactionPool. Cause: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:113) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:95) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:92) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:92) at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:62) at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:50) ... 13 moreCaused by: com.ibatis.sqlmap.client.SqlMapException: There was an error configuring JndiDataSourceDaoTransactionPool. Cause: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at com.ibatis.sqlmap.engine.datasource.JndiDataSourceFactory.initialize(JndiDataSourceFactory.java:60) at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$9.process(SqlMapConfigParser.java:318) at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:111) ... 18 moreCaused by: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:640) at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243) at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:280) at javax.naming.InitialContext.lookup(InitialContext.java:347) at com.ibatis.sqlmap.engine.datasource.JndiDataSourceFactory.initialize(JndiDataSourceFactory.java:50) ... 20 more另外我們在做數據訪問層時經常要用junit測試,這時在197機器上打開weblogic控制檯,然後在開發機器上便可進行測試了.
需要在工程中加入weblogic.jar包,否則會報找不到weblogic類的錯誤.