Java SQL Server jdbc连接

我正在windows身份验证中的localhost上运行此代码段 但是得到以下错误，但是我已经在我的类路径中添加了sqljdbc4 jar 在从eclipse运行时，我还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。

此错误没有显示“身份验证错误”，而是显示“连接错误”，原因是“连接被拒绝”。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，连接字符串应如下所示：

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

jdbc:sqlserver://localhost:\SQLEXPRESS；databasename=yatin

---

您没有提供用户名或密码，在计算出端口号后可能需要这样做。有关更多详细信息，请参阅参考文档。

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"

如果发现

TCP/IP

协议的状态为

Disabled

，则需要

启用它

此外，您还需要重新启动服务：
打开cmd>键入服务，然后向下滚动到SQL Server（MSSQLServer），然后重新启动服务
您忘记提及实例名称。请参见解释如何在sqlserver中使用连接url

如果没有提到完整的服务器名，则会出现如下错误

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.".

我的服务器名是
V_UDAY\FRAMEWORK，
我删除了
URL
中的
FRAMEWORK
实例（在Java代码中）并执行，然后我得到了如下错误

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.".

下图显示了使用斜杠分隔的服务器名


sqljdbc4是执行以下Java程序所必需的。下载jar或从

使用Java连接到sqlserver的示例。这里
JSF
是数据库名

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：在连接
url
中提及实例名称
FRAMEWORK
，如果您已经删除了实例名称。
根据Microsoft文档

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

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

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

完成此操作后，下一步：-

转到所有程序->搜索SQL Server配置管理器。打开它
在左窗格中展开SQL server网络配置
单击protocols作为实例名称在大多数情况下都是SQLEXPRESS的协议
点击TCP IP。TCP IP属性窗口将被打开
选择enabled属性并将所有属性侦听为“YES”
导航到IP地址选项卡，检查IP所有部分TC动态端口是否为1433，如果不是，则进行设置
然后申请并确认

现在转到左窗格中SQL server配置管理器下的SQL server服务部分。点击它

在大多数情况下，您将看到数据库引擎正在运行一个实例名为SQLEXPRESS的引擎，右键单击它并停止它，然后再次启动它
现在重新运行代码
连接被拒绝：连接。验证连接属性。确保SQL Server实例正在主机上运行，并在端口接受TCP/IP连接。确保到端口的TCP连接未被防火墙阻止。-也就是说，检查实例是否在指定的端口上运行，是否正在接受连接请求，检查凭据是否正确！检查：别忘了检查防火墙！小修正。这里，您提到要更改“TCP动态端口”。但实际上，我们必须更改TCP端口，而不是TCP动态端口。快乐编码。