c - How to update a SQL Server database from Labwindows CVI -

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i trying update sql server database cvi. have code:

    update [ebob].[dbo].[tblvessel]     set [ebob].[dbo].[tblvessel].[contents] = [labic].[dbo].[tolvassabamex2].[material]     [labic].[dbo].[tolvassabamex2]     [ebob].[dbo].[tblvessel].[vesselid] = [labic].[dbo].[tolvassabamex2].[id]

i use code sql server , works, when used in cvi not update:

int cvicallback actualizar_i (int panel, int control, int event,     void *callbackdata, int eventdata1, int eventdata2) {     switch (event)     {       case event_commit:          conexion2();           int tolva;          char material[26];          //float valor;            getctrlval(panel, panel_2_ring, &tolva);          getctrlval(panel, panel_2_string, &material[0]);          //getctrlval(panel, panel_2_numeric, &valor);           char comando[500]={0};         sprintf(comando, "update tolvassabamex2 set contents = %s id = %u", material, tolva);           int hstmt;           hstmt=dbpreparesql(hdbc, comando);          dbexecutepreparedsql (hstmt);           //sprintf(comando2"update [ebob].[dbo].[tblvessel] set [ebob].[dbo].[tblvessel].[contents] = [labic].[dbo].[tolvassabamex2].[material] [labic].[dbo].[tolvassabamex2] [ebob].[dbo].[tblvessel].[vesselid] = [labic].[dbo].[tolvassabamex2].[id]");          break; }        //update [labic].[dbo].[tolvassabamex2] set contents = %s [labic].[dbo].[tolvassabamex2].[id] = %u", material, tolva return 0;

and been using following commands sqltoolkit cvi not work dbpreparesql, dbactivatesql


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