通过 c# mysql 连接执行存储过程时出现错误“列的数据太长”

Question

I am writing a C# application that will access a MySQL Database using a stored procedure with 5 parameters:

in startTime varchar(20), 
in endTime varchar(20), 
in tagID Int,
in FullDay Int,
in iteration Int

that returns 3 variables all integers. When executing the MySQLCommand I get the error: "Data too long for column 'startTime' at row 41".

Here is my code:

//create command
MySqlCommand cmd = new MySqlCommand("GetArchiveData", connection);
cmd.CommandType = CommandType.StoredProcedure;

cmd.Parameters.AddWithValue("startTime", startIn);
cmd.Parameters["startTime"].Direction = ParameterDirection.Input;

cmd.Parameters.AddWithValue("endTime", endIn);
cmd.Parameters["endTime"].Direction = ParameterDirection.Input;

cmd.Parameters.AddWithValue("tagID", tagIn);
cmd.Parameters["tagID"].Direction = ParameterDirection.Input;

cmd.Parameters.AddWithValue("FullDay", fdIn);
cmd.Parameters["FullDay"].Direction = ParameterDirection.Input;

cmd.Parameters.AddWithValue("iteration", iterationIn);
cmd.Parameters["iteration"].Direction = ParameterDirection.Input;

if (cmd.Connection.State == ConnectionState.Closed)
{
    cmd.Connection.Open();
}
MySqlDataReader dr = cmd.ExecuteReader();

while (dr.Read())
{
    TagData tagData = new TagData();
    tagData.TagID = tagIn;
    tagData.Dsttimestamp = Convert.ToInt32(dr["timestamp"]);
    tagData.PvValue = Convert.ToInt32(dr["sp"]);
    tagData.PvValue = Convert.ToInt32(dr["pv"]);

    tagDataList.Add(tagData);
}
dr.Close();

this.CloseConnection();
return tagDataList; 

If anyone knows why this would happen and why the first occurrence would be row 41 it would be greatly appreciated.

UPDATE:

Removing the Single quotations that are required in the MySQL statement in workbench from the strings startIn and endIn has solved that issue. MySQL uses single quotes to define strings where the C# variable is already declared as a string.

Answer 1

It looks like your problem is in the sproc. Have you looked at the vaklue you are passing in to it? It just seems the value is too long for the column so looking at what is being passed will let you know for sure.

Answer 2

I don't have 50 reputation yet. This is not an answer, this is more of a comment. I'll edit if it becomes an answer.

Where do you populate 'startTime'? By the looks of things you're giving it a value > 20 characters.

Answer 3

Inserting value is too long for the column. Please debug and Check whether u are inserting correct type of data or correct type value for the column.
There is an hard limit on how much data can be stored in a single row of a mysql table, regardless of the number of columns or the individual column length.