GdaDataModelFilterSQL

GdaDataModelFilterSQL — Filtering data from one or several GdaDataModel objects

Functions

Types and Values

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.

Functions

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.

Parameters

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).

Parameters

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.

Parameters

sel

a GdaDataModelFilterSQL object.

 

Returns

TRUE if successful, FALSE if there was an error.

Types and Values

struct GdaDataModelFilterSQL

struct GdaDataModelFilterSQL;