GdaDataModelFilterSQL

## GdaDataModelFilterSQL GdaDataModelFilterSQL — Filtering data from one or several GdaDataModel objects |

## Synopsis

                GdaDataModelFilterSQL;
    GdaDataModel* gda_data_model_filter_sql_new (void);
    void        gda_data_model_filter_sql_add_source
                                                (GdaDataModelFilterSQL *sel,
                                                 const gchar *name,
                                                 GdaDataModel *source);
    void        gda_data_model_filter_sql_set_sql
                                                (GdaDataModelFilterSQL *sel,
                                                 const gchar *sql);
    gboolean    gda_data_model_filter_sql_run   (GdaDataModelFilterSQL *sel);

## Object Hierarchy

      GObject
       +----GdaObject
             +----GdaDataModelRow
                   +----GdaDataModelArray
                         +----GdaDataModelFilterSQL

## Implemented Interfaces

GdaDataModelFilterSQL implements GdaDataModel.

## Description

The GdaDataModelFilterSQL object implements simple SQL "SELECT" queries accessing data stored in various GdaDataModel objects which it is instructed to use.

## Details

### GdaDataModelFilterSQL

    typedef struct _GdaDataModelFilterSQL GdaDataModelFilterSQL;

### gda_data_model_filter_sql_new ()

    GdaDataModel* gda_data_model_filter_sql_new (void);

Creates a new GdaDataModelFilterSQL object, which allows programs to filter GdaDataModel's based on a given SQL SELECT command.

A GdaDataModelFilterSQL is just another GdaDataModel-based class, so it can be used in the same way any other data model class is.

Returns : | the newly created object.

### gda_data_model_filter_sql_add_source ()

    void        gda_data_model_filter_sql_add_source
                                                (GdaDataModelFilterSQL *sel,
                                                 const gchar *name,
                                                 GdaDataModel *source);

Adds a data model as a source of data for the GdaDataModelFilterSQL object. When the select object is run (via gda_data_model_filter_sql_run), it will parse the SQL and get the required data from the source data models.

`sel` : | a GdaDataModelFilterSQL object.
`name` : | name to identify the data model (usually a table name).
`source` : | a GdaDataModel from which to get data.

### gda_data_model_filter_sql_set_sql ()

    void        gda_data_model_filter_sql_set_sql
                                                (GdaDataModelFilterSQL *sel,
                                                 const gchar *sql);

Sets the SQL command to be used on the given GdaDataModelFilterSQL object for filtering rows from the source data model (which is set with gda_data_model_filter_sql_set_source).

`sel` : | a GdaDataModelFilterSQL object.
`sql` : | the SQL command to be used for filtering rows.

### gda_data_model_filter_sql_run ()

    gboolean    gda_data_model_filter_sql_run   (GdaDataModelFilterSQL *sel);

Runs the query and fills in the GdaDataModelFilterSQL object with the rows that matched the SQL command (which can be set with gda_data_model_filter_sql_set_sql) associated with this GdaDataModelFilterSQL object.

After calling this function, if everything is successful, the GdaDataModelFilterSQL object will contain the matched rows, which can then be accessed like a normal GdaDataModel.

`sel` : | a GdaDataModelFilterSQL object.
Returns : | `TRUE` if successful, `FALSE` if there was an error.