我已经编写了一个程序,它在mysql数据库中搜索给定的印地语单词,并检索存储在数据库中的相应英文名称。当我在select语句中直接给出印地语单词时,它工作得很好,但是我想使用一个变量来给出它,这样它可以更通用,但是我没有得到同样的结果..有谁能帮我解决这个问题..谢谢
这是我写的代码

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
import com.microsoft.sqlserver.jdbc.*;
import java.sql.*;

public class Example {

public static void main(String[] argv) {


    try {

        Class.forName("com.mysql.jdbc.Driver");

        }
    catch (ClassNotFoundException e)
        {

        System.out.println("Where is your MySQL JDBC Driver?");
        e.printStackTrace();
        return;

        }


    Connection connection = null;

                         SQLServerDataSource dataSource = new SQLServerDataSource();
                                 dataSource.setServerName("COMP-PC");
                                dataSource.setPortNumber(1433);
                              dataSource.setDatabaseName("concept");
                              dataSource.setUser("root");
                            dataSource.setPassword("abc");

        try
         {
        connection = dataSource.getConnection();
        connection.setAutoCommit(false);
        System.out.println("Connected to server !!!");
         Statement select = connection.createStatement();
         String var="N'हल्दी'";

     ResultSet result = select.executeQuery



               ("SELECT Name, Id FROM MConcept where CName=N'हल्दी'");
     **// When given like the above statement it works fine



                 ("SELECT Name, Id FROM MConcept where CName='"+var+" ' ");
    **//This does not give result


      System.out.println("Got results:");
      while(result.next()) { // process results one row at a time

      String Name = result.getString(1);
      int ID = result.getInt(2);

       System.out.println("name = " + Name);
       System.out.println("id = " + ID);
       }
      select.close();
     connection.close();
      }




  catch (SQLException e)
  {
   System.out.println("Connection Failed! Check output console");
   e.printStackTrace();
   return;
   }

    if (connection != null)
     {
    System.out.println("Successfully connected!");

     }
   else
    {
System.out.println("Failed to make connection!");
    }


   }
 }

最佳答案

你的第二句话不正确。
应该是

"SELECT Name, Id FROM MConcept where CName=" + var

但我强烈建议使用PreparedStatement并阅读这个SQL注入的警告故事->http://xkcd.com/327/

07-28 11:45