[feature] add unsafeColumnAt procs, that return unsafe cstring from InstantRow (#11647)

changelog.md

@@ -19,8 +19,11 @@
 
 - Enable Oid usage in hashtables. (#11472)
 
+- Added `unsafeColumnAt` procs, that return unsafe cstring from InstantRow. (#11647)
+
 - Make public `Sha1Digest` and `Sha1State` types and `newSha1State`, `update` and `finalize` procedures from `sha1` module. (#11694)
 
+
 ## Language additions
 
 

lib/impure/db_mysql.nim

@@ -286,6 +286,10 @@ proc `[]`*(row: InstantRow, col: int): string {.inline.} =
   ## Returns text for given column of the row.
   $row.row[col]
 
+proc unsafeColumnAt*(row: InstantRow, index: int): cstring {.inline.} =
+  ## Return cstring of given column of the row
+  row.row[index]
+
 proc len*(row: InstantRow): int {.inline.} =
   ## Returns number of columns in the row.
   row.len

lib/impure/db_odbc.nim

@@ -330,7 +330,11 @@ iterator instantRows*(db: var DbConn, query: SqlQuery,
 
 proc `[]`*(row: InstantRow, col: int): string {.inline.} =
   ## Returns text for given column of the row
-  row.row[col]
+  $row.row[col]
+
+proc unsafeColumnAt*(row: InstantRow, index: int): cstring {.inline.} =
+  ## Return cstring of given column of the row
+  row.row[index]
 
 proc len*(row: InstantRow): int {.inline.} =
   ## Returns number of columns in the row

lib/impure/db_postgres.nim

@@ -381,6 +381,10 @@ proc `[]`*(row: InstantRow; col: int): string {.inline.} =
   ## returns text for given column of the row
   $pqgetvalue(row.res, int32(row.line), int32(col))
 
+proc unsafeColumnAt*(row: InstantRow, index: int): cstring {.inline.} =
+  ## Return cstring of given column of the row
+  pqgetvalue(row.res, int32(row.line), int32(index))
+
 proc len*(row: InstantRow): int {.inline.} =
   ## returns number of columns in the row
   int(pqNfields(row.res))

lib/impure/db_sqlite.nim

@@ -359,6 +359,14 @@ proc `[]`*(row: InstantRow, col: int32): string {.inline.} =
   ##   example code
   $column_text(row, col)
 
+proc unsafeColumnAt*(row: InstantRow, index: int32): cstring {.inline.} =
+  ## Returns cstring for given column of the row.
+  ##
+  ## See also:
+  ## * `instantRows iterator <#instantRows.i,DbConn,SqlQuery,varargs[string,]>`_
+  ##   example code
+  column_text(row, index)
+
 proc len*(row: InstantRow): int32 {.inline.} =
   ## Returns number of columns in a row.
   ##