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])
array - the first row of results as an array indexed from 0 or a MDB_Error, if fail
Таблица 34-1. Возможные значения PEAR_Error
| Error code | Error message | Reason | Solution |
|---|---|---|---|
| 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 query*() 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. |
query() , limitQuery() , prepareQuery() , executeQuery() , queryRow() , queryOne() , queryAll()
| Пред. | Начало | След. |
| MDB_Common::queryAll() | Уровень выше | MDB_Common::queryOne() |
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