GdaSelect

GdaSelect — Filtering data from GdaDataModel

Functions

Types and Values

Description

Functions

gda_select_new ()

GdaDataModel *
gda_select_new (void);

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

A GdaSelect 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_select_add_source ()

void
gda_select_add_source (GdaSelect *sel,
                       const gchar *name,
                       GdaDataModel *source);

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

Parameters

sel

a GdaSelect object.

 

name

name to identify the data model (usually a table name).

 

source

a GdaDataModel from which to get data.

 

gda_select_set_sql ()

void
gda_select_set_sql (GdaSelect *sel,
                    const gchar *sql);

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

Parameters

sel

a GdaSelect object.

 

sql

the SQL command to be used for filtering rows.

 

gda_select_run ()

gboolean
gda_select_run (GdaSelect *sel);

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

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

Parameters

sel

a GdaSelect object.

 

Returns

TRUE if successful, FALSE if there was an error.

Types and Values

GdaSelectPrivate

typedef struct _GdaSelectPrivate GdaSelectPrivate;