What's the number scheme for 'colno' for Select call in PDO driver

[Sanjeev Kumar <replyskumar@xxxxxxxxx>]

Hi,

In the implemetation of Pdo-driver (extension) , what's the Sequence/Index
scheme for parameter:  'colno'  ?

This param 'colno' is input in driver calls (of PDO statement) :

int SKEL_stmt_describe_col(pdo_stmt_t *stmt, int colno TSRMLS_DC)

int SKEL_stmt_get_col_data(pdo_stmt_t *stmt, int colno, ...)


e.g If the script has cmds:
Insert into Table test1(col1 int, col2 string, col3 real)
  SELECT  col2,col3 from test1;

The driver would which values for colno ?

-sanjeev