无法将应用程序连接到数据库

Question

我使用Eclipses数据源资源管理器将我的Web应用程序连接到数据库时遇到问题.

这就是我做的:

也许我确实配置了错误的驱动程序.这就是我如何从eclipse Helios配置驱动程序定义.Window-> Preferences-> DataManagement-> Conectivity-> Driver Definitions:

1

2

3

4

我能够启动应用程序服务器,甚至可以通过浏览器访问应用程序.但我无法与数据库进行交互.这就是webapp的配置文件的样子:

persistence.xml中

<?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>

太阳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>

另外我想提一下,我使用此命令从控制台启动数据库:

C:\ glassfishv3\bin> asadmin start-database

我究竟做错了什么？为什么我无法连接到数据库？

Answer 1

你有错误的jar文件.使用derbyclient.jar而不是derby.jar作为驱动程序.

derby.jar用于嵌入模式下的derby.derbyclient.jar用于网络/服务器模式,这是您在连接字符串中定义的内容:

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