Question

当我尝试运行此程序时，我收到此异常。这是微软的一个例子。我已经通过项目属性将sqljdbc4.jar添加到netbeans中的类路径中，用于编译和运行。我还测试了可以通过使用下面的import语句找到该类 - 在编译期间没有错误，因此它必须找到jar。

是否与sqldbc4.jar引用的dll或某些sql dll有关？

这是确切的例外，下面是确切的代码，密码除外。

例外：

run:
java.sql.SQLException: No suitable driver found for jdbc:microsoft:sqlserver://localhost:1433;databaseName=HealthCareDatabase
Error Trace in getConnection() : No suitable driver found for jdbc:microsoft:sqlserver://localhost:1433;databaseName=HealthCareDatabase
Error: No active Connection
    at java.sql.DriverManager.getConnection(DriverManager.java:602)
    at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at javaapplication1.Connect.getConnection(Connect.java:35)
    at javaapplication1.Connect.displayDbProperties(Connect.java:50)
    at javaapplication1.JavaApplication1.main(JavaApplication1.java:23)
BUILD SUCCESSFUL (total time: 1 second)

代码：

 package javaapplication1;
import com.microsoft.sqlserver.jdbc.SQLServerDriver;

import java.*;

public class Connect {

    private java.sql.Connection con = null;
    private final String url = "jdbc:microsoft:sqlserver://";
    private final String serverName = "localhost";
    private final String portNumber = "1433";
    private final String databaseName = "HealthCareDatabase";
    private final String userName = "larry";
    private final String password = "xxxxxxx";

    // Constructor
    public Connect() {
    }

    private String getConnectionUrl() {
        return url + serverName + ":" + portNumber + ";databaseName=" + databaseName ;
    }

    private java.sql.Connection getConnection() {
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            con = java.sql.DriverManager.getConnection(getConnectionUrl(), userName, password);
            if (con != null) {
                System.out.println("Connection Successful!");
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("Error Trace in getConnection() : " + e.getMessage());
        }
        return con;
    }

    public void displayDbProperties() {
        java.sql.DatabaseMetaData dm = null;
        java.sql.ResultSet rs = null;
        try {
            con = this.getConnection();
            if (con != null) {
                dm = con.getMetaData();
                System.out.println("Driver Information");
                System.out.println("\tDriver Name: " + dm.getDriverName());
                System.out.println("\tDriver Version: " + dm.getDriverVersion());
                System.out.println("\nDatabase Information ");
                System.out.println("\tDatabase Name: " + dm.getDatabaseProductName());
                System.out.println("\tDatabase Version: " + dm.getDatabaseProductVersion());
                System.out.println("Avalilable Catalogs ");
                rs = dm.getCatalogs();
                while (rs.next()) {
                    System.out.println("\tcatalog: " + rs.getString(1));
                }
                rs.close();
                rs = null;
                closeConnection();
            } else {
                System.out.println("Error: No active Connection");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        dm = null;
    }

    private void closeConnection() {
        try {
            if (con != null) {
                con.close();
            }
            con = null;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws Exception {
        Connect myDbTest = new Connect();
        myDbTest.displayDbProperties();
    }

}

Answer 1

您的网址应为jdbc:sqlserver://server:port;DatabaseName=dbname
和班级名称应该像com.microsoft.sqlserver.jdbc.SQLServerDriver
使用MicrosoftSQL Server JDBC Driver 2.0

Answer 2

以下是从SQL数据库中读取的简单代码。数据库名称是“database1”。表名是“table1”。它包含两列“uname”和“pass”。别忘了在项目中添加“sqljdbc4.jar”。 Download sqljdbc4.jar

public class NewClass {

    public static void main(String[] args) {

        Connection conn = null;
        String dbName = "database1";
        String serverip="192.168.100.100";
        String serverport="1433";
        String url = "jdbc:sqlserver://"+serverip+"\\SQLEXPRESS:"+serverport+";databaseName="+dbName+"";
        Statement stmt = null;
        ResultSet result = null;
        String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
        String databaseUserName = "admin";
        String databasePassword = "root";
        try {
            Class.forName(driver).newInstance();
            conn = DriverManager.getConnection(url, databaseUserName, databasePassword);
            stmt = conn.createStatement();
            result = null;
            String pa,us;
            result = stmt.executeQuery("select * from table1 ");

            while (result.next()) {
                us=result.getString("uname");
                pa = result.getString("pass");              
                System.out.println(us+"  "+pa);
            }

            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Answer 3

我遇到了同样的错误，但是有一个正确的连接字符串。我的问题是驱动程序没有被使用，因此在编译的战争中进行了优化。

请务必导入驱动程序：

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

然后强迫它被包含在最后的战争中，你可以做这样的事情：

SQLServerDriver driver = new SQLServerDriver();

这一行是原始问题。这也有效：

{{1}}

Answer 4

您可以使用sqljdbc4-2.0.jar尝试如下：

 public void getConnection() throws ClassNotFoundException, SQLException, IllegalAccessException, InstantiationException {
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
        String url = "jdbc:sqlserver://<SERVER_IP>:<PORT_NO>;databaseName=" + DATABASE_NAME;
        Connection conn = DriverManager.getConnection(url, USERNAME, PASSWORD);
        System.out.println("DB Connection started");
        Statement sta = conn.createStatement();
        String Sql = "select * from TABLE_NAME";
        ResultSet rs = sta.executeQuery(Sql);
        while (rs.next()) {
            System.out.println(rs.getString("COLUMN_NAME"));
        }
    }

Answer 5

对于希望使用maven解决问题的人。在POM中添加以下依赖项：

<dependency>
    <groupId>com.microsoft.sqlserver</groupId>
    <artifactId>mssql-jdbc</artifactId>
    <version>7.0.0.jre8</version>
</dependency>

并使用以下代码进行连接：

String connectionUrl = "jdbc:sqlserver://localhost:1433;databaseName=master;user=sa;password=your_password";

try {
    System.out.print("Connecting to SQL Server ... ");
    try (Connection connection = DriverManager.getConnection(connectionUrl))        {
        System.out.println("Done.");
    }
} catch (Exception e) {
    System.out.println();
    e.printStackTrace();
}

寻找this链接以查找其他CRUD类型的查询。

java.sql.SQLException：没有为jdbc找到合适的驱动程序：microsoft：sqlserver

5 个答案: