MDB_Common::getCol()
Вернуться к: MDB
MDB_Common::getCol()
Synopsis
array &getCol ( string $query , string $type = null , array $params = array() , array $param_types = null , mixed $colnum = 0 )
Fetch a single column from a result set of a query. The function takes care of doing the query and freeing the results when finished.
Parameter
- string $query
-
the SQL query
- string $type
-
if supplied, the type of the column in the result set will be set for fetching
- array $params
-
if supplied, prepareQuery()/ executeQuery() will be used with this array as execute parameters
- array $param_types
-
if supplied, the values in $param will automatically set to the passed datatypes
- mixed $colnum
-
which column to return (integer [column number, starting at 0] or string [column name])
Return value
array - the first row of results as an array indexed from 0 or a MDB_Error, if fail
Throws
| Error code | Error message | Reason | Solution |
|---|---|---|---|
| MDB_ERROR_INVALID | NULL | SQL statement for preparing is not valid. | See the prepareQuery() documentation, if you want to use a SQL statemt using wildcards. |
| MDB_ERROR_NEED_MORE_DATA | NULL | To less data for filling the prepared SQL statement. | Check the number of wild cards given in the SQL statement prepareQuery() . Check the count of entries in the array for $params. The count of entries have to be equal to the number of wild cards. |
| MDB_ERROR_NO_DB_SELECTED | NULL | No database was chosen. | Check the DSN in connect() . |
| MDB_ERROR_TRUNCATED | NULL | The result set contains fewer then two columns | Check the SQL query or choose another get*() function |
| every other error code | Database specific error | Check the database related section of PHP-Manual to detect the reason for this error. In the most cases a misformed SQL statement. Ie. using LIMIT in a SQL-Statement for an Oracle database. |
Note
This function can not be called statically.
See
query() , limitQuery() , prepareQuery() , executeQuery() , getRow() , getOne() , getAssoc()
Вернуться к: MDB