DataTable from ExecuteQuery contains only string datatype. about csharp-sqlite

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ExecuteQuery is part of the SQLiteDatabase class in the Benchmark sample.

It is not part of the C# implementation, simply a sample.

Any volunteers to extend the functionality of this class?

Original comment by [email protected] on 21 Jan 2010 at 3:29

• Changed state: Accepted
• Added labels: Priority-Low, Type-Enhancement
• Removed labels: Priority-Medium, Type-Defect

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The problem seems to be the function csSQLite.sqlite3_column_type, it only 
returns
the type SQLITE_NULL (5).

Original comment by seeseekey on 21 Jan 2010 at 4:50

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Original comment by [email protected] on 21 Jan 2010 at 8:37

• Added labels: Priority-Medium, Type-Defect
• Removed labels: Priority-Low, Type-Enhancement

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column_type is returned correctly under version 3.6.22;  
Please update to latest version and retest;

Note: column_type will be SQLITE_NULL if no rows are returned.

Original comment by [email protected] on 26 Jan 2010 at 2:19

• Changed state: CannotReproduce

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I had test the newest version and can reproduce the error again. I had attach a
modified benchmark.cs which i used to reproduce the error.

Original comment by seeseekey on 26 Jan 2010 at 3:13

Attachments:

• Benchmark.cs

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Added Column type to returned DataTable in SQLiteDatabase class

Original comment by [email protected] on 26 Jan 2010 at 4:19

• Changed state: Fixed

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[deleted comment]

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The change of column data type cannot be done after table has been populated. 
The 
implemented change table.Columns[i].DataType = typeof(String);
Genereates the following error.

"Cannot change DataType of a column once it has data"

Reading and setting the schema could be defined as a separate method which is 
run 
before the readrows process is done.

By the way will the change also work for in query casts like:

CAST(columnName as Integer) as Alias1?

I have done some testing and it seems as if data type string (5) is returned 
regardless. 

Original comment by [email protected] on 28 Jan 2010 at 1:27