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[英]Hibernate - Unable to make JDBC Connection [jdbc:mysql//localhost:3306/hibernatedb
[英]Eclipse - Hibernate : No suitable driver found for jdbc:mysql://localhost:3306/hibernatedb
我試圖通過編寫一個簡單的java程序來學習Hibernate。 我使用MySQL作為數據庫,運行程序時出現上述錯誤。 我在互聯網上看到了很多解決方案,並嘗試了一切,但無濟於事。 我究竟做錯了什么?
配置文件:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernatedb</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<mapping resource="com/test/hibernate/student.hbm.xml" />
</session-factory>
</hibernate-configuration>
控制台輸出:
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.hibernate.exception.JDBCConnectionException: Cannot open connection
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:74)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:420)
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119)
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57)
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326)
at com.test.hibernate.SimpleTest.main(SimpleTest.java:23)
Caused by: java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/hibernatedb
at java.sql.DriverManager.getConnection(DriverManager.java:689)
at java.sql.DriverManager.getConnection(DriverManager.java:208)
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:417)
... 5 more
很可能你沒有正確添加mysql-connector庫,因為在你發布的Run配置的快照中,該庫出現在一個名為“hibernate test”的項目中,該項目包含一個名為“mysql-connector-etc.jar”的文件,但這不是在類路徑中設置JAR的方法。
這樣做:最好在項目的Java Build Path中添加“mysql-connector-etc.jar”:彈出項目的上下文菜單,以及Build Path > Configure Build Path > Libraries > Add external jars
。 然后選擇mysql-connector JAR並輸入。 從那時起,Eclipse將把這個JAR包含在你應該執行的項目的任何執行中(所以你不必再關心它了)。
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