java.lang.ClassNotFoundException：com.microsoft.jdbc.sqlserver.SQLServerDriver：我加载了正确的驱动程序吗？ [英] java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver : Am I loading the right driver?

问题描述

当我运行以下代码片段连接到数据源以通过查询获取数据时：

When I run the following snippet to connect to datasource to get the data out through queries :

        try {
        String driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
        Class.forName(driver);
        String Url = "jdbc:sqlserver://localhost:1433;databaseName=movies";
        Connection connection = DriverManager.getConnection(Url,"sa", "xxxxxxx);
        //            Context initContext = new InitialContext();
        //            Context envContext = (Context)initContext.lookup("java:comp/env");
        //            DataSource ds = (DataSource)envContext.lookup("");
        //            Connection connection = ds.getConnection();
        String query_name = "select name from list where name='" + data + "'";

此异常跟踪显示：

java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at gui.MainGui.startSqlServerDataSearch(MainGui.java:148)
at gui.MainGui$3.run(MainGui.java:129)
at java.lang.Thread.run(Thread.java:619)

为什么我得到这个例外？我已经连接到sql server（通过加载这里）并且可以看到sql server中定义的数据库。以下快照告诉我们：

Why am I getting this exception ? I have already made a connection to the sql server (by loading the drivers as given here) and can see the database defined in sql server. The following snapshot tells this :

推荐答案

已定义数据库且 Class.forName（驱动程序）;是不够的。

Having database defined and Class.forName(driver); is not enough.

您需要确保适当的数据库驱动程序jar 在类路径中。

You need to make sure appropriate database driver jar is in classpath.

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