I need a workaround for Excel Guessing Data Types problem

c# ado.net jet import-from-excel
Homam picture Homam · Aug 29, 2010 · Viewed 9.9k times · Source

I'm creating a utility to import data from Excel to Oracle database,

I have a fixed template for the excel file,

Now, when I'm trying to import the data by Jet provider and ADO.Net - Ole connection tools, I found the following problem: there're some columns haven't been imported because there are mixed data types in their columns [string and number],

I looked for this problem on the internet I found the reason is guessing data types from Excel

The load code:

connection = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0};Extended Properties=Excel 8.0;");
string columns = "P_ID, FULL_NAME_AR, job_no, GENDER, BIRTH_DATE, RELIGION, MARITAL_STATUS, NAT_ID, JOB_Name, FIRST_HIRE_DATE, HIRE_DATE, CONTRACT_TYPE, GRADE_CODE, QUALIFICATION";
string sheetName = "[Emps$]";
OleDbCommand command = new OleDbCommand(string.Format("select {0} from {1} where p_id is not null", columns, sheetName), connection);

connection.Open();
dr = command.ExecuteReader();
DataTable table = new DataTable();
table.Load(dr);

What should I do to tell Excel STOP GUESSING and give me the data as Text ?

if there isn't, can you help me with any workarounds ?

Thanks in advance

Answer

Homam picture Homam · Aug 30, 2010

I found a solution by adding IMEX=1 for the connection string, but there's a special format for it which descriped in the following link.

The IMEX parameter is for columns that use mixed numeric and alpha values. The Excel driver will typically scan the first several rows in order to determine what data type to use for each column. If a column is determined to be numeric based upon a scan of the first several rows, then any rows with alpha characters in this column will be returned as Null. The IMEX parameter (1 is input mode) forces the data type of the column to text so that alphanumeric values are handled properly.

Regards

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