SQL 服务器连接（JDBC）

Question

我想使用 JDBC 将 microsoft SQL 服务器与 java 连接，但我不能。

我已经完成了这些步骤：

• 下载 jdbc https://go.microsoft.com/fwlink/?linkid=2137600
• 提取 zip 文件
• add mssql-jdbc-8.4.1.jre14.jar to my eclipse IDE: --> propeties --> java build path --> classpath --> add external JAR --> selected mssql-jdbc-8.4.1.jre14 .jar
• 在 Microsoft SQL 服务器配置管理器中 --> SQL 服务器网络配置 --> MCSQLSERVER 协议 --> tpc/ip --> 启用
• 我创建了一个名为 theapplegeek 的 SQL 服务器身份验证

java-版本：

openjdk version "15.0.1" 2020-10-20
OpenJDK Runtime Environment (build 15.0.1+9-18)
OpenJDK 64-Bit Server VM (build 15.0.1+9-18, mixed mode, sharing)

我写了这段代码：

package sqlConn;

import java.sql.*;

public class connessione {
        public static void main(String[] args) {
            // Create a variable for the connection string.
            String connectionUrl = "jdbc:sqlserver://localhost:1344;databaseName=magazzino_automatica";
            String user = "theapplegeek";
            String password = "microsoftsqlservermerda";

            try (Connection con = DriverManager.getConnection(connectionUrl, user, password)) {
            } 
            // Handle any errors that may have occurred.
            catch (SQLException e) {
                e.printStackTrace();
            }
        }
}

error:

com.microsoft.sqlserver.jdbc.SQLServerException: La connessione TCP/IP all'host localhost, porta 1344 non è riuscita. Errore: "Connect timed out. Verificare le proprietà di connessione. Assicurarsi che un'istanza di SQL Server sia in esecuzione sull'host e accetti le connessioni TCP/IP alla porta. Verificare inoltre che le connessioni TCP alla porta non siano bloccate da un firewall.".
    at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:234)
    at com.microsoft.sqlserver.jdbc.SQLServerException.ConvertConnectExceptionToSQLServerException(SQLServerException.java:285)
    at com.microsoft.sqlserver.jdbc.SocketFinder.findSocket(IOBuffer.java:2462)
    at com.microsoft.sqlserver.jdbc.TDSChannel.open(IOBuffer.java:668)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:2695)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:2362)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:2213)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:1276)
    at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:861)
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
    at sql/sqlConn.connessione.main(connessione.java:12)

Answer 1

在您的 JDBC URL 中，将“1344”更改为“1433”。 此外，请确保您的防火墙规则不会阻止连接。 请参阅https://docs.microsoft.com/en-us/sql/sql-server/install/configure-the-windows-firewall-to-allow-sql-server-access?view=sql-server-ver15

Answer 2

In SQL configuration manager -> SQL Server Network Configuration->Protocols for SQL Express-> Right click on TCP/IP you have to enable the TCP for that port. 对于某些版本的 MSSQL，默认情况下禁用 TCP。 Also make sure the TCP is enabled for your port Right click on TCP/Ip ->click properties->click IP addresses under IP all the value for TCP port should match to your port 1344.