我有一个通过mysql-odbc连接器运行sql语句的程序。当我对具有几何图形列类型的表的select查询使用占位符时,会引发异常。
这是密码
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,或者从表中删除列,或者将select语句更改为
SELECT * FROM TestT where id = 1
我得到以下回应
Number of rows returned: 1
如何防止错误发生,而不必删除或更改列类型,并在select语句中使用占位符(?)保留列类型?
我使用的是mysql odbc5.3ansi驱动程序和mysql 5.7.23
暂无答案!
目前还没有任何答案,快来回答吧!