SQL Server jdbc连接

Question

我在windows身份验证中在localhost上运行此代码片段但是出现了以下错误，但我已经在我的类路径中添加了sqljdbc4 jar，并且在从eclipse运行时我也在构建路径中添加了jar

import java.io.*;
import java.sql.*;
import java.util.GregorianCalendar;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

class  Cms_truncate
{
    public static void main(String[] args) 
    {
         Calendar cal = new GregorianCalendar();

         //String name="cmscim";
                 Connection conn = null;

         String url = "jdbc:sqlserver://localhost\SQLEXPRESS;databasename=yatin";
         String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
         String userName = ""; 
         String password = "";
         Statement stmt;
         try
         {

         Class.forName(driver);//.newInstance();
         conn = DriverManager.getConnection(url,userName,password);
         String query = "truncate table cim";
         stmt = conn.createStatement();
         int flag = stmt.executeUpdate(query);
         System.out.println("flag = "+flag); 
         conn.close();
        System.out.println("");
         } catch (Exception e) {
         e.printStackTrace();
         }

    }
}

错误：

com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host localhost, port 1433 has failed. Error: "Connection refused: connect. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".
    at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190)
    at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:241)
    at com.microsoft.sqlserver.jdbc.SocketFinder.findSocket(IOBuffer.java:2243)
    at com.microsoft.sqlserver.jdbc.TDSChannel.open(IOBuffer.java:491)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1309)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:991)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827)
    at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at Cms_truncate.main(Cms_truncate.java:28)

请帮帮我。

Answer 1

此错误不会说“身份验证错误”，它会因“连接被拒绝”而显示“连接错误”。 这意味着您需要指定正确的端口号。 您需要检查SQL Server配置并更新连接字符串。

根据MSDN文档 ，连接字符串应如下所示：

jdbc:sqlserver://localhost:<insert_proper_port_here>\SQLEXPRESS;databasename=yatin

您没有提供用户名或密码，一旦您弄清楚了端口号，您可能需要这样做。 有关详细信息，请参阅参考文档。

Answer 2

我认为这是配置问题。

Go to Run -> SQL Server Configuration Manger

Expand -> SQL Server *version_no* Network Configuration

Then click on - "Protocol for SQLEXPRESS"

如果您发现TCP/IP协议Disabled状态，则需要enable它。

此外，您还需要重新启动服务：打开cmd>键入Services，然后向下滚动到SQL Server（MSSQLServer），然后重新启动服务

Answer 3

首先，无论何时在URL中使用SQL实例名称，都必须指定//[serverName[\\\\instanceName][:portNumber]]databaseName

对于Eg： jdbc:sqlserver://localhost\\\\SQLEXPRESS:1433;databasename=yatin

一旦完成下一步： -

1. 转到所有程序 - >搜索SQL Server配置管理器。打开它
2. 在左窗格中展开SQL Server网络配置
3. 在大多数情况下，单击协议实例名称它将是SQLEXPRESS的协议
4. 单击TCP IP。 TCP IP属性窗口将打开
5. 选择启用的属性并将所有属性视为“是”
6. 导航到IP地址选项卡，检查是否所有部分TC动态端口都是1433（如果没有），然后进行设置

7. 然后申请并确定

8. 现在转到左窗格中SQL Server Configuration Manager下的SQL Server服务部分。 点击它

9. 在SQLEXPRESS的大多数情况下，您将看到数据库引擎正在运行具有实例名称的数据库引擎，右键单击它并停止它然后再次启动它。

现在重新运行代码

Answer 4

你忘了提到实例名称。 请参阅构建连接URL说明如何在sqlserver中使用连接URL

如果你没有提到完整的服务器名，那么你会得到错误

com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host localhost , port 1433 has failed. Error: "Connection refused: connect. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".

我的服务器名称是V_UDAY\\FRAMEWORK,我删除了URL FRAMEWORK实例（在Java代码中）并执行，然后我收到如下错误。

com.microsoft.sqlserver.jdbc.SQLServerException: The TCP/IP connection to the host V_UDAY, port 1433 has failed. Error: "Connection refused: connect. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190)
at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:241)
at com.microsoft.sqlserver.jdbc.SocketFinder.findSocket(IOBuffer.java:2243)
at com.microsoft.sqlserver.jdbc.TDSChannel.open(IOBuffer.java:491)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1309)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:991)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at com.testsql.SqlServerDatabaseConnectionUsingJava.getLocalConnection(SqlServerDatabaseConnectionUsingJava.java:28)
at com.testsql.SqlServerDatabaseConnectionUsingJava.main(SqlServerDatabaseConnectionUsingJava.java:18)
Exception in getLocalConeection() The TCP/IP connection to the host V_UDAY, port 1433 has failed. Error: "Connection refused: connect. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall.".

在图像下方显示了带有slash分隔的服务器名称

执行以下Java程序需要sqljdbc4。 下载sqljdbc4 jar或从Microsoft JDBC Driver 4.0 for SQL Server 。

使用Java连接到sqlserver的示例。 这里JSF是数据库名称。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class SqlServerDatabaseConnectionUsingJava {
    private static Connection connection = null;
    //1.jdbc driver name
    private static String SQL_JDBC_DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    // 2. Database URL, V_UDAY\FRAMEWORK is ServerName and JSF is DataBase name
    private static String URL = "jdbc:sqlserver://V_UDAY;instanceName=FRAMEWORK;databaseName=JSF";
    //3.Database credentials
    private static String USERNAME = "udaykiran";//UserName
    private static String PASSWORD = "Pa55word";//Password

public static void main(String[] args) {
    getLocalConnection();
}

public static Connection getLocalConnection() {
    try {
        Class.forName(SQL_JDBC_DRIVER);// Register jdbc driver

        System.out.println("****Connect to Database****");

        //4. open a connection
        connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);

        System.out.println("DataBase connect to: "+ connection.getMetaData().getDriverName());
        System.out.println("URL: "+ connection.getMetaData().getURL());

        setConnectionClose();
        System.out.println("Database Connection Closed");
    } catch (Exception e) {
        e.printStackTrace();
        System.err.println("Exception in getLocalConeection() "+e.getMessage());
    }
    return connection;
}

public static void setConnectionClose() throws SQLException {
    if (connection != null) {
        connection.close();
    }
}

}

注意：如果您已删除实例名称，请在连接url提及实例名称FRAMEWORK 。

Answer 5

根据Microsoft文档

String url = "jdbc:sqlserver://localhost\SQLEXPRESS:[your_port_tcp];databasename=yatin";

https://msdn.microsoft.com/pt-br/library/ms378428(v=sql.110).aspx