24.1.2. Base de dados

24.1.2.1. Export to PostgreSQL

Exports a vector layer to a PostgreSQL database, creating a new relation. If a relation with the same name exists, it can be removed before the new relation is created. Prior to this a connection between QGIS and the PostgreSQL database has to be created (see eg Creating a stored Connection).

24.1.2.1.1. Parâmetros

Etiqueta

Nome

Tipo

Descrição

Layer to import

ENTRADA

[vector: any]

Vector layer to add to the database

Banco de dados (nome da conexão)

BANCO DE DADOS

[string]

Name of the database connection (not the database name). Existing connections will be shown in the combobox.

Esquema (nome do esquema)

Opcional

ESQUEMA

[string]

Padrão: ‘público’

Name of the schema to store the data. It can be a new one or already exist.

Table to import to (leave blank to use layer name)

Opcional

TABLENAME

[string]

Padrão: ‘’

Defines a table name for the imported vector file. If nothing is added, the layer name will be used.

Primary key field

Opcional

PRIMARY_KEY

[tablefield: any]

Sets the primary key field from an existing field in the vector layer. A column with unique values can be used as Primary key for the database.

Geometry column

GEOMETRY_COLUMN

[string]

Padrão: ‘geom’

Defines the name of the geometry column in the new PostGIS table. Geometry information for the features is stored in this column.

Encoding

Opcional

ENCODING

[string]

Default: ‘UTF-8’

Defines the encoding of the output layer

Overwrite

OVERWRITE

[boolean]

Padrão: Verdadeiro

If the specified table exists, setting this option to True will make sure that it is deleted and a new table will be created before the features are added. If this option is False and the table exists, the algorithm will throw an exception (“relation already exists”).

Create spatial index

CREATEINDEX

[boolean]

Padrão: Verdadeiro

Specifies whether to create a spatial index or not

Convert field names to lowercase

LOWERCASE_NAMES

[boolean]

Padrão: Verdadeiro

Converts the field names of the input vector layer to lowercase

Drop length constraint on character fields

DROP_STRING_LENGTH

[boolean]

Padrão: Falso

Should length constraints on character fields be dropped or not

Create single-part geometries instead of multi-part

FORCE_SINGLEPART

[boolean]

Padrão: Falso

Should the features of the output layer be single-part instead of multi-part. By default the existing geometries information are preserved.

24.1.2.1.2. Saídas

The algorithm has no output.

24.1.2.1.3. Python code

Algorithm ID: qgis:importintopostgis

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usando os algoritmos do processamento a partir do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.2.2. Export to SpatiaLite

Exports a vector layer to a SpatiaLite database. Prior to this a connection between QGIS and the SpatiaLite database has to be created (see eg Camadas SpatiaLite).

24.1.2.2.1. Parâmetros

Etiqueta

Nome

Tipo

Descrição

Layer to import

ENTRADA

[vector: any]

Vector layer to add to the database

File database

BANCO DE DADOS

[vector: any]

The SQLite/SpatiaLite database file to connect to

Table to import to (leave blank to use layer name)

Opcional

TABLENAME

[string]

Padrão: ‘’

Defines the table name for the imported vector file. If nothing is specified, the layer name will be used.

Primary key field

Opcional

PRIMARY_KEY

[tablefield: any]

Use a field in the input vector layer as the primary key

Geometry column

GEOMETRY_COLUMN

[string]

Padrão: ‘geom’

Defines the name of the geometry column in the new SpatiaLite table. Geometry information for the features is stored in this column.

Encoding

Opcional

ENCODING

[string]

Default: ‘UTF-8’

Defines the encoding of the output layer

Overwrite

OVERWRITE

[boolean]

Padrão: Verdadeiro

If the specified table exists, setting this option to True will make sure that it is deleted and a new table will be created before the features of the layer is added. If this option is False and the table exists, the algorithm will throw an exception (“table already exists”).

Create spatial index

CREATEINDEX

[boolean]

Padrão: Verdadeiro

Specifies whether to create a spatial index or not

Convert field names to lowercase

LOWERCASE_NAMES

[boolean]

Padrão: Verdadeiro

Convert the field names of the input vector layer to lowercase

Drop length constraint on character fields

DROP_STRING_LENGTH

[boolean]

Padrão: Falso

Should length constraints on character fields be dropped or not

Create single-part geometries instead of multi-part

FORCE_SINGLEPART

[boolean]

Padrão: Falso

Should the features of the output layer be single-part instead of multi-part. By default the existing geometries information are preserved.

24.1.2.2.2. Saídas

The algorithm has no output.

24.1.2.2.3. Python code

Algorithm ID: qgis:importintospatialite

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usando os algoritmos do processamento a partir do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.2.3. Package layers

Adds layers to a GeoPackage.

If the GeoPackage exists and Overwrite existing GeoPackage is checked, it will be overwritten (removed and recreated). If the GeoPackage exists and Overwrite existing GeoPackage is not checked, the layer will be appended.

24.1.2.3.1. Parâmetros

Etiqueta

Nome

Tipo

Descrição

Camadas de entrada

CAMADAS

[vector: any] [list]

The (vector) layers to import into the GeoPackage. Raster layers are not supported. If a raster layer is added, a QgsProcessingException will be thrown.

Overwrite existing GeoPackage

OVERWRITE

[boolean]

Padrão: Falso

If the specified GeoPackage exists, setting this option to True will make sure that it is deleted and a new one will be created before the layers are added. If set to False, layers will be appended.

Save layer styles into GeoPackage

SAVE_STYLES

[boolean]

Padrão: Verdadeiro

Save the layer styles

Destination GeoPackage

SAÍDA

[file]

If not specified the GeoPackage will be saved in the temporary folder.

24.1.2.3.2. Saídas

Etiqueta

Nome

Tipo

Descrição

Layers within new package

OUTPUT_LAYERS

[string] [list]

The list of layers added to the GeoPackage.

24.1.2.3.3. Python code

Algorithm ID: qgis:package

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usando os algoritmos do processamento a partir do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.2.4. PostgreSQL execute and load SQL

Allows a SQL database query to be performed on a PostgreSQL database connected to QGIS and loads the result. The algorithm won’t create a new layer: it is designed to run queries on the layer itself.

Exemplo

  1. Set all the values of an existing field to a fixed value. The SQL query string will be:

    UPDATE your_table SET field_to_update=20;
    

    In the example above, the values of the field field_to_update of the table your_table will be all set to 20.

  2. Create a new area column and calculate the area of each feature with the ST_AREA PostGIS function.

    -- Create the new column "area" on the table your_table"
    ALTER TABLE your_table ADD COLUMN area double precision;
    -- Update the "area" column and calculate the area of each feature:
    UPDATE your_table SET area=ST_AREA(geom);
    

24.1.2.4.1. Parâmetros

Etiqueta

Nome

Tipo

Descrição

Banco de dados (nome da conexão)

BANCO DE DADOS

[string]

The database connection (not the database name). Existing connections will be shown in the combobox.

SQL query

SQL

[string]

Defines the SQL query, for example 'UPDATE my_table SET field=10'.

Unique ID field name

ID_FIELD

[string]

Default: id

Sets the primary key field (a column in the result table)

Geometry field name

Opcional

GEOMETRY_FIELD

[string]

Padrão: ‘geom’

Name of the geometry column (a column in the result table)

24.1.2.4.2. Saídas

Etiqueta

Nome

Tipo

Descrição

SQL layer

SAÍDA

[vector: any]

The resulting vector layer to be loaded into QGIS.

24.1.2.4.3. Python code

Algorithm ID: qgis:postgisexecuteandloadsql

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usando os algoritmos do processamento a partir do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.2.5. PostgreSQL execute SQL

Allows a SQL database query to be performed on a PostgreSQL database connected to QGIS. The algorithm won’t create a new layer: it is designed to run queries on the layer itself.

Exemplo

  1. Set all the values of an existing field to a fixed value. The SQL query string will be:

    UPDATE your_table SET field_to_update=20;
    

    In the example above, the values of the field field_to_update of the table your_table will be all set to 20.

  2. Create a new area column and calculate the area of each feature with the ST_AREA PostGIS function.

    -- Create the new column "area" on the table your_table"
    ALTER TABLE your_table ADD COLUMN area double precision;
    -- Update the "area" column and calculate the area of each feature:
    UPDATE your_table SET area=ST_AREA(geom);
    

24.1.2.5.1. Parâmetros

Etiqueta

Nome

Tipo

Descrição

Banco de dados (nome da conexão)

BANCO DE DADOS

[string]

The database connection (not the database name). Existing connections will be shown in the combobox.

SQL query

SQL

[string]

Defines the SQL query, for example 'UPDATE my_table SET field=10'.

24.1.2.5.2. Saídas

No output is created. The SQL query is executed in place.

24.1.2.5.3. Python code

Algorithm ID: qgis:postgisexecutesql

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usando os algoritmos do processamento a partir do Terminal Python. for details on how to run processing algorithms from the Python console.

24.1.2.6. SpatiaLite execute SQL

Allows a SQL database query to be performed on a SpatiaLite database connected to QGIS. The algorithm won’t create a new layer: it is designed to run queries on the layer itself.

Ver também

PostgreSQL execute SQL, Executar SQL

For some SQL query examples see PostGIS SQL Query Examples.

24.1.2.6.1. Parâmetros

Etiqueta

Nome

Tipo

Descrição

File Database

BANCO DE DADOS

[vector]

Default: not set

The SQLite/SpatiaLite database file to connect to

SQL query

SQL

[string]

Padrão: ‘’

Defines the SQL query, for example 'UPDATE my_table SET field=10'.

24.1.2.6.2. Saídas

No output is created. The SQL query is executed in place.

24.1.2.6.3. Python code

Algorithm ID: qgis:spatialiteexecutesql

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usando os algoritmos do processamento a partir do Terminal Python. for details on how to run processing algorithms from the Python console.