Error converting data type varchar to bigint

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Hi folks,

Stuck with this error for so long.
When directly execute from sql script in SSMS, no issue but from web application i got this error '

Error converting data type varchar to bigint

' .

I use this way in application.

using (SqlConnection conn = new SqlConnection(strconn))

sqlComm.Parameters.Add(new SqlParameter("@para", strPara));

I'm thinking to change the code.

What I have tried:

I'm thinking to change the code.

Posted 29-Aug-21 15:10pm

octavia81

Updated 30-Aug-21 8:08am

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Patrice T 29-Aug-21 23:22pm

You have a secret error in your secret code.

2 solutions

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Wendelius · Answer 1 · 2021-08-29T17:25:00

Based on the error message you set a string to the parameter as value and trust that the database does the conversion to bigint for you. This won't happen if the string is invalid on the database side so instead you should explicitly do the conversion at calling side.

First of all define the data type for the parameter using SqlParameterCollection.Add Method (System.Data.SqlClient), Add(String, SqlDbType) [^]

Now before setting the parameter you can use Int64.TryParse Method (System) | Microsoft Docs[^] to parse the text to proper number. Depending on the situation, you may need to remove the thousand separators or change decimal point.

After that you can set the number as the parameter value and the database doesn't need to do any conversion.

MarcusCole6833 · Answer 2 · 2021-08-30T08:08:00

Solution 2

As to solution 1 that cover everything I would do to amend this problem. One further consideration is the mapping from the SQL to SQL. See the Microsoft Docs for the appropriate mapping.

SQL-CLR Type Mapping - ADO.NET | Microsoft Docs[^]

Posted 30-Aug-21 8:08am

MarcusCole6833