“未知的数据库‘MYDB’”使用JPA

Question

错误我试图连接到MySQL服务器，但出现此错误。当mydb是系统中唯一的名称时。请告诉我，我错了......

我的坚持XML是便接踵而来：

<persistence 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_1_0.xsd" 
version="1.0"> 

<persistence-unit name="MyPersistenceUnit"> 

    <provider>org.hibernate.ejb.HibernatePersistence</provider> 

    <properties> 
    <property name="hibernate.archive.autodetection" value="class" /> 
    <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" /> 
    <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/mydb" /> 
    <property name="hibernate.connection.username" value="root" /> 
    <property name="hibernate.connection.password" value="tft" /> 
    <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> 

    <property name="hibernate.hbm2ddl.auto" value="create" /> 

    <property name="hibernate.show_sql" value="true" /> 
    <property name="hibernate.format_sql" value="true" /> 
    <property name="hibernate.use_sql_comments" value="true" /> 
    </properties> 

</persistence-unit> 
</persistence> 

Answer 1

1.You要检查你的MySQL JDBC驱动程序

2.You必须检查的MySQL服务器状态并验证用户名为&的密码。