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Diffstat (limited to 'lib/impure/db_mysql.nim')
| -rw-r--r-- | lib/impure/db_mysql.nim | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/impure/db_mysql.nim b/lib/impure/db_mysql.nim index 619c2a656..7c2901efd 100644 --- a/lib/impure/db_mysql.nim +++ b/lib/impure/db_mysql.nim @@ -16,6 +16,9 @@ type DbConn* = PMySQL ## encapsulates a database connection Row* = seq[string] ## a row of a dataset. NULL database values will be ## transformed always to the empty string. + InstantRow* = tuple[row: cstringArray, len: int] ## a handle that can be + ## used to get a row's + ## column text on demand EDb* = object of IOError ## exception that is raised if a database error occurs SqlQuery* = distinct string ## an SQL query string @@ -127,6 +130,30 @@ iterator fastRows*(db: DbConn, query: SqlQuery, yield result properFreeResult(sqlres, row) +iterator instantRows*(db: DbConn, query: SqlQuery, + args: varargs[string, `$`]): InstantRow + {.tags: [FReadDb].} = + ## same as fastRows but returns a handle that can be used to get column text + ## on demand using []. Returned handle is valid only within interator body. + rawExec(db, query, args) + var sqlres = mysql.useResult(db) + if sqlres != nil: + let L = int(mysql.numFields(sqlres)) + var row: cstringArray + while true: + row = mysql.fetchRow(sqlres) + if row == nil: break + yield (row: row, len: L) + properFreeResult(sqlres, row) + +proc `[]`*(row: InstantRow, col: int): string {.inline.} = + ## returns text for given column of the row + $row.row[col] + +proc len*(row: InstantRow): int {.inline.} = + ## returns number of columns in the row + row.len + proc getRow*(db: DbConn, query: SqlQuery, args: varargs[string, `$`]): Row {.tags: [FReadDB].} = ## retrieves a single row. If the query doesn't return any rows, this proc |