Convenient functions

Convenient functions — Do quickly some actions

Functions

Description

Functions

gda_open_connection ()

GdaConnection *
gda_open_connection (const gchar *dsn,
                     const gchar *username,
                     const gchar *password,
                     GdaConnectionOptions options,
                     GError **error);

Convenient function to open a connection to a Data Source, see also gda_client_open_connection().

Parameters

dsn

a data source name

 

error

a place to store errors, or NULL

 

Returns

a GdaConnection object if the connection was sucessfully opened, NULL otherwise


gda_execute_select_command ()

GdaDataModel *
gda_execute_select_command (GdaConnection *cnn,
                            const gchar *sql,
                            GError **error);

Execute a SQL SELECT command over an opened connection.

Return: a new GdaDataModel if succesfull, NULL otherwise

Parameters

cnn

an opened connection

 

sql

a query statament must begin with "SELECT"

 

error

a place to store errors, or NULL

 

Returns


gda_execute_sql_command ()

gint
gda_execute_sql_command (GdaConnection *cnn,
                         const gchar *sql,
                         GError **error);

This is a convenient function to execute a SQL command over the opened connection.

Parameters

cnn

an opened connection

 

sql

a query statament must begin with "SELECT"

 

error

a place to store errors, or NULL

 

Returns

the number of rows affected or -1.


gda_create_table ()

gboolean
gda_create_table (GdaConnection *cnn,
                  const gchar *table_name,
                  GError **error,
                  ...);

Create a Table over an opened connection using a pair list of colum name and GType as arguments, you need to finish the list using NULL.

This is just a convenient function to create tables quickly, using defaults for the provider and converting the GType passed to the corresponding type in the provider; to use a custom type or more advanced characteristics in a specific provider use the GdaServerOperation framework.

Parameters

cnn

an opened connection

 

table_name

num_columns

 

error

a place to store errors, or NULL

 

...

pairs of column name and GType, finish with NULL

 

Returns

TRUE if the table was created; FALSE and set error otherwise


gda_drop_table ()

gboolean
gda_drop_table (GdaConnection *cnn,
                const gchar *table_name,
                GError **error);

This is just a convenient function to drop a table in an opened connection.

Parameters

cnn

an opened connection

 

error

a place to store errors, or NULL

 

Returns

TRUE if the table was dropped


gda_insert_row_into_table ()

gboolean
gda_insert_row_into_table (GdaConnection *cnn,
                           const gchar *table_name,
                           GError **error,
                           ...);

This is just a convenient function to insert a row with the values given as argument. The values must correspond with the GType of the column to set, otherwise throw to an error. Finish the list with NULL.

The arguments must be pairs of column name followed by his value.

Parameters

cnn

an opened connection

 

error

a place to store errors, or NULL

 

...

a list of string/GValue pairs where the string is the name of the column followed by its GValue to set in the insert operation, finished by NULL

 

Returns

TRUE if no error occurred, and FALSE and set error otherwise


gda_insert_row_into_table_from_string ()

gboolean
gda_insert_row_into_table_from_string (GdaConnection *cnn,
                                       const gchar *table_name,
                                       GError **error,
                                       ...);

This is just a convenient function to insert a row with the values given as arguments. The values must be strings that could be converted to the type in the corresponding column. Finish the list with NULL.

The arguments must be pairs of column name followed by his value.

The SQL command is like: INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...)

Parameters

cnn

an opened connection

 

error

a place to store errors, or NULL

 

...

a list of strings to be converted as value, finished by NULL

 

Returns

TRUE if no error occurred, and FALSE and set error otherwise


gda_update_value_in_table ()

gboolean
gda_update_value_in_table (GdaConnection *cnn,
                           const gchar *table_name,
                           const gchar *search_for_column,
                           const GValue *condition,
                           const gchar *column_name,
                           const GValue *new_value,
                           GError **error);

This is just a convenient function to update values in a table on a given column where the row is fitting the given condition.

The SQL command is like: UPDATE INTO table_name SET column_name = new_value WHERE search_for_column = condition

Parameters

cnn

an opened connection

 

search_for_column

the name of the column to used in the WHERE condition clause

 

condition

a GValue to used to find the value to be updated; it must correspond with the GType of the column used to search

 

column_name

the column containing the value to be updated

 

new_value

the new value to update to; the GValue must correspond with the GType of the column to update

 

error

a place to store errors, or NULL

 

Returns

TRUE if no error occurred


gda_update_values_in_table ()

gboolean
gda_update_values_in_table (GdaConnection *cnn,
                            const gchar *table_name,
                            const gchar *condition_column_name,
                            const GValue *condition,
                            GError **error,
                            ...);

This is just a convenient function to update values in a table on a given column where the row is fitting the given condition.

The SQL command is like: UPDATE INTO table_name SET column1 = new_value1, column2 = new_value2 ... WHERE condition_column_name = condition

Parameters

cnn

an opened connection

 

table_name

the name of the table where the update will be done

 

condition_column_name

the name of the column to used in the WHERE condition clause

 

condition

a GValue to used to find the values to be updated; it must correspond with the column's GType

 

error

a place to store errors, or NULL

 

...

a list of string/GValue pairs where the string is the name of the column to be updated followed by the new GValue to set, finished by NULL

 

Returns

TRUE if no error occurred


gda_delete_row_from_table ()

gboolean
gda_delete_row_from_table (GdaConnection *cnn,
                           const gchar *table_name,
                           const gchar *condition_column_name,
                           const GValue *condition,
                           GError **error);

This is just a convenient function to delete the row fitting the given condition from the given table.

condition must be a valid GValue and must correspond with the GType of the column to use in the WHERE clause.

The SQL command is like: DELETE FROM table_name WHERE contition_column_name = condition

Parameters

cnn

an opened connection

 

condition_column_name

the name of the column to used in the WHERE condition clause

 

condition

a GValue to used to find the row to be deleted

 

error

a place to store errors, or NULL

 

Returns

TRUE if no error occurred, and FALSE and set error otherwise

Types and Values