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.
the SQL query
if supplied, the type of the column in the result set will be set for fetching
if supplied, prepareQuery()/ executeQuery() will be used with this array as execute parameters
if supplied, the values in $param will automatically set to the passed datatypes
which column to return (integer [column number, starting at 0] or string [column name])
Table 33-1. Possible PEAR_Error values
| Error code | Error message | Reason | Solution |
|---|---|---|---|
| MDB_ERROR_INVALID | NULL | SQL statment 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 statment. | Check the number of wild cards given in the SQL statment 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 choosen. | 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 statment. Ie. using LIMIT in a SQL-Statment for an Oracle database. |