27.2.8. Vector miscellaneous

27.2.8.1. Build virtual vector 

Creates a virtual vector layer that contains a set of vector layers. The output virtual vector layer will not be opened in the current project.

This algorithm is especially useful in case another algorithm needs multiple layers but accept only one vrt in which the layers are specified.

参数

标注

名称

类型

描述

Input datasources

INPUT

[vector: any] [list]

Select the vector layers you want to use to build the virtual vector

Create "unioned" VRT

UNIONED

[boolean]

Default: False

Check if you want to unite all the vectors in a single vrt file

Virtual vector

OUTPUT

[same as input]

默认: [保存到临时文件]

Specify the output layer containing only the duplicates. One of:

保存到临时文件
保存到文件…

输出

标注	名称	类型	描述
Virtual vector	`OUTPUT`	[vector: any]	The output virtual vector made from the chosen sources

Python代码

Algorithm ID: gdal:buildvirtualvector

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

27.2.8.2. Execute SQL 

Runs a simple or complex query with SQL syntax on the source layer. The result of the query will be added as a new layer.

This algorithm is derived from the GDAL ogr2ogr utility.

参数

Basic parameters

标注	名称	类型	描述
输入图层	`INPUT`	[vector: any]	OGR-supported input vector layer
SQL expression	`SQL`	[string]	Defines the SQL query, for example `SELECT * FROM my_table WHERE name is not null`.
SQL dialect	`DIALECT`	[enumeration] Default: 0	SQL dialect to use. One of: 0 --- None 1 --- OGR SQL 2 --- SQLite
SQL result	`OUTPUT`	[vector: any]	Specification of the output layer. One of: 保存到临时文件保存到文件… For `Save to File`, the output format has to be specified. All GDAL vector formats are supported. For `Save to a Temporary File` the default output vector layer format will be used.

Advanced parameters

标注

名称

类型

描述

Additional creation options

可选

OPTIONS

[string]

Default: '' (no additional options)

Additional GDAL creation options.

输出

标注	名称	类型	描述
SQL result	`OUTPUT`	[vector: any]	Vector layer created by the query

Python代码

Algorithm ID: gdal:executesql

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

27.2.8.3. Export to PostgreSQL (available connections)

Imports vector layers inside a PostgreSQL database on the basis of an available connection. The connection has to be defined properly beforehand. Be aware that the checkboxes 'Save Username' and 'Save Password' are activated. Then you can use the algorithm.

This algorithm is derived from the GDAL ogr2ogr utility.

参数

标注	名称	类型	描述
Database (connection name)	`DATABASE`	[string]	The PostgreSQL database to connect to
输入图层	`INPUT`	[vector: any]	OGR-supported vector layer to export to the database
Shape encoding 可选	`SHAPE_ENCODING`	[string] Default: ''	Sets the encoding to apply to the data
Output geometry type	`GTYPE`	[enumeration] Default: 0	Defines the output geometry type. One of: 0 --- 1 --- NONE 2 --- GEOMETRY 3 --- POINT 4 --- LINESTRING 5 --- POLYGON 6 --- GEOMETRYCOLLECTION 7 --- MULTIPOINT 8 --- MULTIPOLYGON 9 --- MULTILINESTRING
Assign an output CRS 可选	`A_SRS`	[crs] Default: None	Defines the output CRS of the database table
Reproject to this CRS on output 可选	`T_SRS`	[crs] Default: None	Reprojects/transforms to this CRS on output
Override source CRS 可选	`S_SRS`	[crs] Default: None	Overrides the input layer CRS
Schema (schema name) 可选	`SCHEMA`	[string] Default: 'public'	Defines the schema for the database table
Table to export to (leave blank to use layer name) 可选	`TABLE`	[string] Default: ''	Defines a name for the table that will be imported into the database. By default the table name is the name of the input vector file.
Primary Key (new field) 可选	`PK`	[string] Default: 'id'	Defines which attribute field will be the primary key of the database table
Primary Key (existing field, used if the above option is left empty) 可选	`PRIMARY_KEY`	[tablefield: any] Default: None	Defines which attribute field in the exported layer will be the primary key of the database table
Geometry column name 可选	`GEOCOLUMN`	[string] Default: 'geom'	Defines in which attribute field of the database there will be the geometry information
Vector dimensions 可选	`DIM`	[enumeration] Default: 0 (2D)	Defines if the vector file to be imported has 2D or 3D data. One of: 0 --- 2 1 --- 3
Distance tolerance for simplification 可选	`SIMPLIFY`	[string] Default: ''	Defines a distance tolerance for the simplification of the vector geometries to be imported. By default there is no simplification.
Maximum distance between 2 nodes (densification) 可选	`SEGMENTIZE`	[string] Default: ''	The maximum distance between two nodes. Used to create intermediate points. By default there is no densification.
Select features by extent (defined in input layer CRS) 可选	`SPAT`	[范围] Default: None	You can select features from a given extent that will be in the output table. Available methods are: Calculate from layer…: uses extent of a layer loaded in the current project Calculate from layout map…: uses extent of a layout map item in the active project Calculate from bookmark…: uses extent of a saved bookmark Use map canvas extent Draw on canvas: click and drag a rectangle delimiting the area to take into account Enter the coordinates as `xmin, xmax, ymin, ymax`
Clip the input layer using the above (rectangle) extent 可选	`CLIP`	[boolean] Default: False	The input layer will be clipped by the extent you defined before
Select features using a SQL "WHERE" statement (Ex: column="value") 可选	`WHERE`	[string] Default: ''	Defines with a SQL "WHERE" statement which features should be selected from the input layer
Group N features per transaction (Default: 2000) 可选	`GT`	[string] Default: ''	You can group the input features in transactions where N defines the size. By default N limits the transaction size to 20000 features.
Overwrite existing table 可选	`OVERWRITE`	[boolean] Default: True	If there is a table with the same name in the database, and if this option is set to True, the table will be overwritten.
Append to existing table 可选	`APPEND`	[boolean] Default: False	If checked / True the vector data will be appended to an existing table. New fields found in the input layer are ignored. By default a new table will be created.
Append and add new fields to existing table 可选	`ADDFIELDS`	[boolean] Default: False	If activated the vector data will be appended to an existing table, there won't be a new table created. New fields found in input layer are added to the table. By default a new table will be created.
Do not launder columns/table names 可选	`LAUNDER`	[boolean] Default: False	With this option checked you can prevent the default behaviour (converting column names to lowercase, removing spaces and other invalid characters).
Do not create Spatial Index 可选	`INDEX`	[boolean] Default: False	Prevents a spatial index for the output table from being created. By default, a spatial index is added.
Continue after a failure, skipping the failed feature 可选	`SKIPFAILURES`	[boolean] Default: False
Promote to Multipart 可选	`PROMOTETOMULTI`	[boolean] Default: True	Casts features geometry type to multipart in the output table
Keep width and precision of input attributes 可选	`PRECISION`	[boolean] Default: True	Avoids modifying column attributes to comply with input data
Additional creation options 可选	`OPTIONS`	[string] Default: '' (no additional options)	Additional GDAL creation options.

输出

This algorithm has no output.

Python代码

Algorithm ID: gdal:importvectorintopostgisdatabaseavailableconnections

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

27.2.8.4. Export to PostgreSQL (new connection)

Imports vector layers inside a PostgreSQL database. A new connection to the PostGIS database must be created.

This algorithm is derived from the GDAL ogr2ogr utility.

参数

标注	名称	类型	描述
输入图层	`INPUT`	[vector: any]	OGR-supported vector layer to export to the database
Shape encoding 可选	`SHAPE_ENCODING`	[string] Default: ''	Sets the encoding to apply to the data
Output geometry type	`GTYPE`	[enumeration] Default: 0	Defines the output geometry type. One of: 0 --- 1 --- NONE 2 --- GEOMETRY 3 --- POINT 4 --- LINESTRING 5 --- POLYGON 6 --- GEOMETRYCOLLECTION 7 --- MULTIPOINT 8 --- MULTIPOLYGON 9 --- MULTILINESTRING
Assign an output CRS 可选	`A_SRS`	[crs] Default: None	Defines the output CRS of the database table
Reproject to this CRS on output 可选	`T_SRS`	[crs] Default: None	Reprojects/transforms to this CRS on output
Override source CRS 可选	`S_SRS`	[crs] Default: None	Overrides the input layer CRS
Host 可选	`HOST`	[string] Default: 'localhost'	Name of the database host
Port 可选	`PORT`	[string] Default: '5432'	Port number the PostgreSQL database server listens on
Username 可选	`USER`	[string] Default: ''	User name used to log in to the database
Database name 可选	`DBNAME`	[string] Default: ''	Name of the database
Password 可选	`PASSWORD`	[string] Default: ''	Password used with Username to connect to the database
Schema (schema name) 可选	`SCHEMA`	[string] Default: 'public'	Defines the schema for the database table
Table name, leave blank to use input name 可选	`TABLE`	[string] Default: ''	Defines a name for the table that will be imported into the database. By default the table name is the name of the input vector file.
Primary Key (new field) 可选	`PK`	[string] Default: 'id'	Defines which attribute field will be the primary key of the database table
Primary Key (existing field, used if the above option is left empty) 可选	`PRIMARY_KEY`	[tablefield: any] Default: None	Defines which attribute field in the exported layer will be the primary key of the database table
Geometry column name 可选	`GEOCOLUMN`	[string] Default: 'geom'	Defines in which attribute field to store the geometry information
Vector dimensions 可选	`DIM`	[enumeration] Default: 0 (2D)	Defines if the vector file to be imported has 2D or 3D data. One of: 0 --- 2D 1 --- 3D
Distance tolerance for simplification 可选	`SIMPLIFY`	[string] Default: ''	Defines a distance tolerance for the simplification of the vector geometries to be imported. By default there is no simplification.
Maximum distance between 2 nodes (densification) 可选	`SEGMENTIZE`	[string] Default: ''	The maximum distance between two nodes. Used to create intermediate points. By default there is no densification.
Select features by extent (defined in input layer CRS) 可选	`SPAT`	[范围] Default: None	You can select features from a given extent that will be in the output table. Available methods are: Calculate from layer…: uses extent of a layer loaded in the current project Calculate from layout map…: uses extent of a layout map item in the active project Calculate from bookmark…: uses extent of a saved bookmark Use map canvas extent Draw on canvas: click and drag a rectangle delimiting the area to take into account Enter the coordinates as `xmin, xmax, ymin, ymax`
Clip the input layer using the above (rectangle) extent 可选	`CLIP`	[boolean] Default: False	The input layer will be clipped by the extent you defined before
Fields to include (leave empty to use all fields) 可选	`FIELDS`	[string] [list] Default: []	Defines fields to keep from the imported vector file. If none is selected, all the fields are imported.
Select features using a SQL "WHERE" statement (Ex: column="value") 可选	`WHERE`	[string] Default: ''	Defines with a SQL "WHERE" statement which features should be selected for the output table
Group N features per transaction (Default: 2000) 可选	`GT`	[string] Default: ''	You can group the input features in transactions where N defines the size. By default N limits the transaction size to 20000 features.
Overwrite existing table 可选	`OVERWRITE`	[boolean] Default: True	If there is a table with the same name in the database, and if this option is set to True, the table will be overwritten.
Append to existing table 可选	`APPEND`	[boolean] Default: False	If checked / True the vector data will be appended to an existing table. New fields found in the input layer are ignored. By default a new table will be created.
Append and add new fields to existing table 可选	`ADDFIELDS`	[boolean] Default: False	If activated the vector data will be appended to an existing table, there won't be created a new table. New fields found in input layer are added to the table. By default a new table will be created.
Do not launder columns/table names 可选	`LAUNDER`	[boolean] Default: False	With this option checked you can prevent the default behaviour (converting column names to lowercase, removing spaces and other invalid characters).
Do not create Spatial Index 可选	`INDEX`	[boolean] Default: False	Prevents a spatial index for the output table from being created. By default, a spatial index is added.
Continue after a failure, skipping the failed feature 可选	`SKIPFAILURES`	[boolean] Default: False
Promote to Multipart 可选	`PROMOTETOMULTI`	[boolean] Default: True	Casts features geometry type to multipart in the output table
Keep width and precision of input attributes 可选	`PRECISION`	[boolean] Default: True	Avoids modifying column attributes to comply with input data
Additional creation options 可选	`OPTIONS`	[string] Default: '' (no additional options)	Additional GDAL creation options.

输出

This algorithm has no output.

Python代码

Algorithm ID: gdal:importvectorintopostgisdatabasenewconnection

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

27.2.8.5. Vector Information 

Creates an information file that lists information about an OGR-supported data source. The output will be shown in a 'Result' window and can be written into a HTML-file. The information includes the geometry type, feature count, the spatial extent, the projection information and many more.

This algorithm is derived from the GDAL ogrinfo utility.

参数

标注	名称	类型	描述
输入图层	`INPUT`	[vector: any]	Input vector layer
Summary output only 可选	`SUMMARY_ONLY`	[boolean] Default: True
Suppress metadata info 可选	`NO_METADATA`	[boolean] Default: False
Layer information	`OUTPUT`	[html] 默认: `[保存到临时文件]`	Specify the output HTML file that includes the file information. One of: 保存到临时文件保存到文件… If no HTML-file is defined the output will be written to a temporary file

输出

标注	名称	类型	描述
Layer information	`OUTPUT`	[html]	The output HTML-file that includes the file information.

Python代码

Algorithm ID: gdal:ogrinfo

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

当你在数据处理工具箱某个算法前悬停时，算法 id 将会展现。*参数字*将会提供参数的名称与数值。参考详见`数据处理_控制台`以获取如何从Python控制台中运行数据处理算法。

27.2.8. Vector miscellaneous

27.2.8.1. Build virtual vector

参数

输出

Python代码

27.2.8.2. Execute SQL

参数

Basic parameters

Advanced parameters

输出

Python代码

27.2.8.3. Export to PostgreSQL (available connections)

参数

输出

Python代码

27.2.8.4. Export to PostgreSQL (new connection)

参数

输出

Python代码

27.2.8.5. Vector Information

参数

输出

Python代码

27.2.8.1. Build virtual vector 

27.2.8.2. Execute SQL 

27.2.8.5. Vector Information 