java - JDBC - 无法与本地主机连接

Question

这个问题已经有答案了:

How can I use the MS JDBC driver with MS SQL Server 2008 Express? (6 个回答)

已关闭 8 年前。

我正在尝试连接名为 SimpleBase 的 Microsoft SQL Server 数据库，该数据库位于我的计算机上，代码如下:

    static final String JDBCDriver = "com.mysql.jdbc.Driver";
    static final String dbURL = "jdbc:mysql://localhost/SimpleBase";
    public static void main(String[] args) throws ClassNotFoundException, SQLException {

            Connection conn = null;
            Statement stmt = null;

            try{
                    Class.forName(JDBCDriver);
                    System.out.println("Connecting");
                    conn = DriverManager.getConnection(dbURL);
                    conn.close();
            }
            catch(SQLException se){
                    se.printStackTrace();
            }
            catch(Exception e){
                    e.printStackTrace();
            }
    }

Eclipse 中的输出是这样的:

Connecting

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The  driver has not received any packets from the server.

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1038)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:338)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2237)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2270)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2069)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at PROKOM.Zadanie11.test.main(test.java:23)
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
    at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
    at java.net.PlainSocketImpl.connect(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:213)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:297)
... 15 more

我怀疑我做错了什么。有人能告诉我什么吗？如果这不完全是我的错，有人能告诉我出了什么问题吗？

Answer 1

MySQL 和 SQL Server 使用不同的驱动程序类和连接 URL

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");    
connection = DriverManager.getConnection
("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=SimpleBase", "user", "");

SQL Server 使用JDBC type 4 driver因此无需显式加载 JDBC 驱动程序