無法將應用程序連接到數據庫

Question

我使用Eclipses數據源瀏覽器將Web應用程序連接到數據庫時遇到問題。

這是我做過什麼：

也許我錯了配置的驅動程序。這是我如何配置eclipse Helios的驅動程序定義。窗口 - >首選項 - > DataManagement-> Conectivity->驅動程序定義：

我能夠啓動應用程序服務器，甚至訪問throgh瀏覽器應用程序。但我無法與數據庫進行交互。這是Web應用程序的配置文件什麼樣子：

的persistence.xml

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> 
<persistence-unit name="jdbc/GroupBuySystem"> 
<class>entities.Administ</class> 
<class>entities.Buyer</class> 
<class>entities.Comment</class> 
<class>entities.Log</class> 
<class>entities.Offer</class> 
<class>entities.Seller</class> 
</persistence-unit> 
    </persistence> 

太陽resources.xml中

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE resources PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.0 Resource Definitions //EN" "http://www.sun.com/software/appserver/dtds/sun-resources_1_3.dtd"> 
<resources> 
<jdbc-resource enabled="true" jndi-name="jdbc/myDatasource" object-type="user" pool-name="Derby_groupbuydb_userPool"/> 
<jdbc-connection-pool allow-non-component-callers="false" associate-with-thread="false" connection-creation-retry-attempts="0" connection-creation-retry-interval-in-seconds="10" connection-leak-reclaim="false" connection-leak-timeout-in-seconds="0" connection-validation-method="auto-commit" datasource-classname="org.apache.derby.jdbc.ClientDataSource" fail-all-connections="false" idle-timeout-in-seconds="300" is-connection-validation-required="false" is-isolation-level-guaranteed="true" lazy-connection-association="false" lazy-connection-enlistment="false" match-connections="false" max-connection-usage-count="0" max-pool-size="32" max-wait-time-in-millis="60000" name="Derby_groupbuydb_userPool" non-transactional-connections="false" pool-resize-quantity="2" res-type="javax.sql.DataSource" statement-timeout-in-seconds="-1" steady-pool-size="8" validate-atmost-once-period-in-seconds="0" wrap-jdbc-objects="false"> 
<property name="serverName" value="localhost"/> 
    <property name="PortNumber" value="1527"/> 
    <property name="DatabaseName" value="groupbuydb"/> 
    <property name="User" value="user"/> 
    <property name="Password" value="pwd"/> 
    <property name="URL" value="jdbc:derby://localhost:1527/groupbuydb;create=true"/> 
<property name="driverClass" value="org.apache.derby.jdbc.ClientDriver"/> 
</jdbc-connection-pool> 
</resources> 

我也想提一提，我開始使用此命令從控制檯數據庫：

C：\ glassfishv3 \ BIN>的asadmin啓動數據庫

我在做什麼錯？爲什麼我無法連接到數據庫？

Answer 1

你有錯誤的jar文件。使用derbyclient.jar而不是derby.jar爲您的驅動程序。

derby.jar適用於嵌入式模式下的德比。 derbyclient.jar中是網絡/服務器模式，那就是你有你的連接字符串中定義了什麼：

<property name="URL" value="jdbc:derby://localhost:1527/groupbuydb;create=true"/>