Structures_DataGrid_DataSource_DBQuery
Description
This class is a data source driver for the PEAR::DB object
Supported operations modes
This driver supports the following operation modes:
| Mode | Supported? |
|---|---|
| Multiple field sorting | yes |
| Insert, update and delete records | no |
Options
This driver accepts the following options:
| Option | Type | Description | Default Value |
|---|---|---|---|
| count_query | string | Query that calculates the number of rows. See below for more information about when such a count query is needed. | '' |
| db_options | array | Options for the created database object. This option is only used when the 'dsn' option is given. | array() |
| dbc | object | A PEAR::DB instance that will be used by this driver. Either this or the 'dsn' option is required. | null |
| dsn | string | A PEAR::DB dsn string. The DB connection will be established by this driver. Either this or the 'dbc' option is required. | null |
| fields | array | Which data fields to fetch from the datasource. An empty array means: all fields. Form: array(field1, field2, ...) | array() |
| generate_columns | bool | Generate Structures_DataGrid_Column objects with labels. See the 'labels' option. DEPRECATED: use Structures_DataGrid::generateColumns() instead | false |
| labels | array | Data field to column label mapping. Only used when 'generate_columns' is true. Form: array(field => label, ...) DEPRECATED: use Structures_DataGrid::generateColumns() instead | array() |
| primaryKey | array | Name(s), or numerical index(es) of the field(s) which contain a unique record identifier (only use several fields in case of a multiple-fields primary key) | null |
General notes
You need to specify either a DB instance or a DB compatible dsn string as an option to use this driver.
If you use complex queries (e.g. with complex joins or with aliases), $datagrid->getRecordCount() might return a wrong result. For the case of GROUP BY, UNION, or DISTINCT in your queries, and for the case of subqueries, this driver already has special handling. However, if you observe wrong record counts, you need to specify a special query that returns only the number of records (e.g. 'SELECT COUNT(*) FROM ...') as an additional option 'count_query' to the bind() call.
You can specify an ORDER BY statement in your query. Please be aware that this sorting statement is then used in *every* query before the sorting options that come from a renderer (e.g. by clicking on the column header when using the HTML_Table renderer which is sent in the HTTP request). If you want to give a default sorting statement that is only used if there is no sorting query in the HTTP request, then use $datagrid->setDefaultSort().