{{ transformations:SQLCommandAction.png}}
====== DATABASE COMMAND ======
Category: Workflow / External\\

\\ 
=====Description=====
This action performs one of these 4 commands on a specified database:  
  * Custom command
  * Create database table
  * Delete database table
  * Delete all rows
  * List tables
  * List table fields

\\ 
=====Use cases=====
  * Export data into a database by instructing the database to bulk load a text file (e.g. previously generated by EasyMorph)
  * Trigger stored procedures

\\ 
=====Action settings=====
^ Setting  ^ Description  ^
|Connector<sup>*</sup>|Select or create a connector to the database.|
|Command|Select the process to run on the database.  Options:  //Create table//, //Delete table//, //Delete all rows//, or //Custom command//.|
|Advanced (Timeout)|Set the number of seconds for this process to complete before timing out.  Default is 1800.  If the action has not\\ completed within the set Timeout, the workflow stops and displays an error.|
<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].\\

\\ 
====Custom command settings====
**Description:**  Sends a free-form SQL query to the specified database. 
^Settings ^Description ^
|Statement|Enter the free-form SQL query to send to the database.  The query can include [[:parameters]] wrapped in braces, which will be replaced with their values during runtime.|
Example:  ''  LOAD DATA INFILE '{FileName}' INTO TABLE {TableName};  ''

\\
====Create table settings====
**Description:**  Creates a new database table.  
Field types are automatically suggested based on the input dataset but can be changed manually. Field names are taken from the input dataset. They are case-sensitive.
^Settings ^Description ^
|Table name<sup>*</sup>|Enter the name of the database table to create.|
|If table already exists|Select how EasyMorph handles cases when the named table already exists in the target database.\\  Options:  //Fail// (the workflow stops with an error), //Do nothing// (the action does nothing and proceeds to the next action),\\ //Delete table// (the original table is deleted), or //Delete rows, keep table// (all records in the table are deleted, but the table structure is kept).|
|Data types|Select whether to use //Simple// or //Advanced// data type definitions in the field list.|
|Field list|Select the columns to insert into the new table and the data type of each column.  Data type options will vary based on the "Data types" option selected (above).|
<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].\\

\\ 
====Delete table settings====
**Description:**  Deletes a database table and all data in it. 
^Settings ^Description ^
|Table name<sup>*</sup>|Enter the name of the database table to delete.|
|If table doesn't exist|Select how EasyMorph will handle cases when the named table is not found in the database.  Options:  //Fail// (the workflow stops with an error) or //Do nothing// (the workflow does nothing and continues to the next action).|
<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].\\

\\ 
====Delete all rows settings====
**Description:**  Deletes a database table and all data in it. Note that some databases don't have a native command for truncation. In such cases truncation is performed with the help of a DELETE query. The operation is atomic meaning that it either deletes everything or, in case of a failure, nothing. The query can include multiple statements if this is supported by the database connector.
^Settings ^Description ^
|Table name<sup>*</sup>|Enter the name of the database table to delete.|
|If table doesn't exist|Select how EasyMorph will handle cases when the named table is not found in the database.  Options:  //Fail// (the workflow stops with an error) or //Do nothing// (the workflow does nothing and continues to the next action).|
<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].\\

\\ 
====List tables settings====
**Description:**  This command creates a two-column dataset consisting of the Schema name and Table name of all tables in the target database.  No settings are required.

\\ 
====List table fields settings====
**Description:**  This command creates a three-column dataset consisting of the Column name, Column data type, and any Column annotations of all fields in the target table.
^Settings ^Description ^
|Table name<sup>*</sup>|Select the database table to retrieve details from.|
<sup>*</sup> Setting can be specified using a [[:parameters|parameter]].\\

\\ 
=====See also=====
  * [[transformations:deletedbrows|Delete database rows]]
  * [[transformations:deletedbrowsbykeys|Delete matching database rows]]
  * [[transformations:updatedb|Update database table]]
  * [[:connectors|Information on connectors]]
  * [[http://easymorph.com/learn/export-database.html|Tutorial: Exporting data into a database]]