使用java（eclipse）时出现SQL语法错误

我正在使用JavaEclipse和mySQL工作台彼此连接。现在我正在使用java编写一些查询代码，但是在一个查询问题中遇到了一个特定的问题，这个问题有一个我不熟悉的错误，这是我在执行了两个运行良好的sql查询后第一次遇到的问题。感谢您的帮助。我将列出代码，然后跟进一个错误

public static void stopTimes() throws SQLException
    {
    stmt = conn.createStatement();
    System.out.println("Enter Route Number: ");
    String route = scan.nextLine();
    System.out.println("Direction?");
    String dir = scan.nextLine();
    System.out.println("Enter the first stop number:");
    String stop1 = scan.nextLine();
    System.out.println("Enter the second stop number:");
String stop2 = scan.nextLine();      
String sql;

  sql = "SELECT DISTINCT bus_stops.stopID, street1, street2 FROM bus_stops INNER JOIN scheduled_stops ON bus_stops.stopID = scheduled_stops.stopID"+
              "WHERE scheduled_stops.routeNumber = '"+route+"' "+
              "AND scheduled_stops.direction = '"+dir+"' "+
              "AND scheduled_stops.stopTime > (SELECT stopTime FROM scheduled_stops WHERE scheduled_stops.stopID = '"+stop1+"' ORDER BY scheduled_stops.stopTime asc limit 1)"+ 
              "AND scheduled_stops.stopTime < (SELECT stopTime FROM scheduled_stops WHERE scheduled_stops.stopID = '"+stop2+"' ORDER BY scheduled_stops.stopTime asc limit 1)";


      ResultSet rs = stmt.executeQuery(sql);

      //STEP 5: Extract data from result set
      while(rs.next()){
         //Retrieve by column name
         String stopID  = rs.getString("stopID");
         String street1 = rs.getString("street1");
         String street2 = rs.getString("street2");
         String stopTime = rs.getString("stopTime");

         //Display values
         System.out.print("Stop ID: " + stopID);
         System.out.print(", Name: " + street1 + "/" +street2);
         System.out.println(", Time: " + stopTime);
      }

}

java.sql.SQLException: You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near'
scheduled_stops.routeNumber = '051' AND scheduled_stops.direction = 'Northbound''
at line 1
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2975)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1600)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1695)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3020)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2949)
at com.mysql.jdbc.Statement.executeQuery(Statement.java:959)
at TransitManager.stopsOnRoute(TransitManager.java:460)
at TransitManager.main(TransitManager.java:104)

---

检查sql字符串在第一行和第四行末尾是否缺少空格。

在stopID和WHERE之间缺少空格。

生成查询时，请记住一点，首先在sql shell或工具中运行它，然后在代码中使用适当的间距和字符串操作实现它

 sql = "SELECT DISTINCT bus_stops.stopID, street1, street2 FROM bus_stops INNER JOIN scheduled_stops ON bus_stops.stopID = scheduled_stops.stopID"+
                  " WHERE scheduled_stops.routeNumber = '"+route+"' "+
                  " AND scheduled_stops.direction = '"+dir+"' "+
                  " AND scheduled_stops.stopTime > (SELECT stopTime FROM scheduled_stops WHERE scheduled_stops.stopID = '"+stop1+"' ORDER BY scheduled_stops.stopTime asc limit 1)"+ 
                  " AND scheduled_stops.stopTime < (SELECT stopTime FROM scheduled_stops WHERE scheduled_stops.stopID = '"+stop2+"' ORDER BY scheduled_stops.stopTime asc limit 1)";

---

正确使用空格。试试这个：

sql = "SELECT DISTINCT bus_stops.stopID, street1, street2 FROM bus_stops INNER JOIN scheduled_stops ON bus_stops.stopID = scheduled_stops.stopID "+
              "WHERE scheduled_stops.routeNumber = '"+route+"' "+
              "AND scheduled_stops.direction = '"+dir+"' "+
              "AND scheduled_stops.stopTime > (SELECT stopTime FROM scheduled_stops WHERE scheduled_stops.stopID = '"+stop1+"' ORDER BY scheduled_stops.stopTime asc limit 1) "+ 
              "AND scheduled_stops.stopTime < (SELECT stopTime FROM scheduled_stops WHERE scheduled_stops.stopID = '"+stop2+"' ORDER BY scheduled_stops.stopTime asc limit 1)";

---

问题在于您正在进行的sql查询，在将其添加到java代码之前，请尝试使用phpmyadmin或mysql workbench进行测试。在查询的每行末尾添加空格。好的，谢谢您的评论。在测试mySQL workbenchAppreciated时，我会更小心使用空格，我会小心使用空格感谢评论，我确实会注意空格