java Eclipse Hibernate:未找到适合jdbc的驱动程序：mysql://localhost:3306/hibernatedb

Question

我试图通过编写一个简单的java程序来学习Hibernate。我使用MySQL作为数据库，运行程序时出现上述错误。我在互联网上看到了许多解决方案，并尝试了一切可能的方法，但都没有成功。我做错了什么

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>

控制台输出：

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

类路径&；库文件夹：

Answer 1

很可能您没有正确添加mysql连接器库，因为在您发布的运行配置的快照中，该库出现在一个名为“hibernate test”的项目中，该项目包含一个名为“mysql-connector-etc.jar”的文件，但这不是在类路径中设置jar的方法

这样做：最好在项目的Java构建路径中添加“mysql-connector-etc.jar”：弹出项目的上下文菜单和Build Path > Configure Build Path > Libraries > Add external jars。然后选择mysql连接器JAR并输入。从那时起，Eclipse将把这个JAR包含到您应该执行的项目的任何执行中（这样您就不必再关心它了）