「未知的數據庫‘MYDB’」使用JPA

Question

錯誤我試圖連接到MySQL服務器，但出現此錯誤。當mydb是系統中唯一的名稱時。請告訴我，我錯了......

我的堅持XML是便接踵而來：

<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要檢查你的MySQL JDBC驅動程序

2.You必須檢查的MySQL服務器狀態並驗證用戶名爲&的密碼。