语句没有返回结果集.Java错误

Question

我正在尝试使用JDBC从java表中删除数据。首先，我计算行数，并确保表不是空的，然后截断数据。

下面是我使用的代码

  Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
    Connection con = DriverManager.getConnection("jdbc:sqlserver://m-i:1433;databaseName=Tes", "sa", "Password");
    Statement cnnt= con.createStatement();
    Statement del1 = con.createStatement();
    ResultSet rs = cnnt.executeQuery("Select count(lea) AS cnt from dbo.Link");
   int count= 0;
    if(rs.next())
    {
        count = rs.getInt("cnt");
    }
  System.out.println(count);
 if(count != 0)
 {
   del1.executeQuery("Truncate Table dbo.Link");
 }
else
   {
       System.out.println("Table is already empty");
   }

错误:

 Exception in thread "main" com.microsoft.sqlserver.jdbc.SQLServerException: The statement did not return a result set.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.doExecuteStatement(SQLServerStatement.java:800)
at com.microsoft.sqlserver.jdbc.SQLServerStatement$StmtExecCmd.doExecute(SQLServerStatement.java:689)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:5696)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1715)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(SQLServerStatement.java:180)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(SQLServerStatement.java:155)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeQuery(SQLServerStatement.java:616)

错误在截断表dbo.Link.

我这样做对吗?

有人能帮我一下吗?

谢谢。

Answer 1

不要使用executeQuery来执行DDL语句;使用executeUpdate

引用链接的Javadocs:

执行给定的SQL语句，该语句可以是INSERT、UPDATE或DELETE语句或不返回任何值的SQL语句，例如SQL DDL语句.

(强调我的)

截断表语句是DDL语句