Question

我有一个通过MySQL ODBC Connector运行SQL语句的程序。当我在具有几何列类型的表上对SELECT查询使用占位符时，会引发异常。

这是代码

static void Main(string[] args)
    {
        try
        {
            using (OdbcConnection connection = new OdbcConnection(ConnectionString))
            {
                connection.Open();

                OdbcCommand command = new OdbcCommand("DROP TABLE IF EXISTS TestT", connection);
                command.ExecuteNonQuery();

                command.CommandText = "CREATE TABLE TestT(ID INT, NAME VARCHAR(20), DeliveryLocation geometry DEFAULT NULL)";
                command.ExecuteNonQuery();

                command.CommandText = "INSERT INTO TestT(ID, NAME) VALUES(1, 'DT'),(2, 'teamDT')";
                command.ExecuteNonQuery();


                command.CommandText = "SELECT * FROM TestT where id = ?";

                var parameter = new OdbcParameter("Parameter1", OdbcType.Int);
                parameter.Direction = ParameterDirection.Input;
                parameter.Value = 1;
                command.Parameters.Add(parameter);

                var adapter = new OdbcDataAdapter
                {
                    SelectCommand = command
                };
                var dataSet = new DataSet();

                adapter.Fill(dataSet);
                var table = dataSet.Tables[0];

                Console.WriteLine($"Number of rows returned: {table.Rows.Count}");
            }
        }
        catch (OdbcException exception)
        {
            for (int i = 0; i < exception.Errors.Count; i++)
            {
                Console.WriteLine("ERROR #" + i + "\n" + "Message: " +
                              exception.Errors[i].Message + "\n" +
                              "Native: " +
                              exception.Errors[i].NativeError.ToString() + "\n" +
                              "Source: " +
                              exception.Errors[i].Source + "\n" +
                              "SQL: " +
                              exception.Errors[i].SQLState + "\n");
            }
        }
    }

按原样运行它会得到以下输出

ERROR #0
Message: [MySQL][ODBC 5.3(a) Driver][mysqld-5.7.23-log]
Native: 517
Source: myodbc5a.dll
SQL: HY000

如果我将DeliveryLocation类型更改为int或从表中删除该列，或将SELECT语句更改为

SELECT * FROM TestT where id = 1

我收到以下答复

Number of rows returned: 1

如何在不必删除或更改列类型并在SELECT语句中继续使用占位符（？）的情况下防止错误发生？

我正在使用MySQL ODBC 5.3 ANSI驱动程序和MySQL 5.7.23

Odbc为具有几何列类型的表准备的语句引发异常

0 个答案: