The following section describes the loading of the SAP extraction data to a MySQL database destination.

Requirements #

Starting from the version Xtract Universal 4.2.26.0 the MySQL ADO.Net driver MySQL Data Provider is provided with the setup of Xtract Universal. There are no additional installations needed to use MySQL database destination.

Connection #

Adding a Destination #

  1. In the main window of the Designer, navigate to Server > Manage Destinations. The window “Manage Destinations” opens.
  2. Click [Add] to create a new destination. The window “Destination Details” opens.
  3. Enter a Name for the destination.
  4. Select the destination Type from the drop-down menu.

Destination Details #

mysql_destination_details

Server Name
Enter the name of the server the MySQL database is hosted on.

Server Port
Enter the port of the server the MySQL database is hosted on.

User Name
Enter the MySQL database user ID.

Password
Enter the password of the database user.

Database
Enter the name of the MySQL database.

Test Connection
Check the database connection.

Settings #

Opening the Destination Settings #

  1. Create or select an existing extraction (see also Getting Started with Xtract Universal).
  2. Click [Destinations]. The window “Destination Settings” opens. Destination-settings

The following settings can be defined for the destination:

Destination Settings #

ext_spec_set_de_form

File Name #

File Name determines the name of the target table. You have the following options:

  • Same as name of SAP object: Copy the name of the SAP object
  • Same as name of extraction: Adopt name of extraction
  • Custom: Here you can define your own name.

  • Append timestamp: adds the timestamp in the UTC format (_YYYY_MM_DD_hh_mm_ss_fff) to the file name of the extraction.

Column Name Style #

Defines the style of the column name. Following options are available:

column_name_style_options

  • Code: The SAP technical column name is used as column name in the destination e.g., MAKTX.
  • PrefixedCode: The SAP technical column name is prefixed by SAP object name and the tilde character e.g., MAKT~MAKTX
  • CodeAndText: The SAP technical column name and the SAP description separated by an underscore are used as column name in the destination e.g., MAKTX_Material Description (Short Text).
  • TextAndCode: The SAP description and the SAP technical column name description separated by an underscore are used as column name in the destination e.g., Material Description (Short Text)_MAKTX.
  • Text: The SAP description is used as column name in the destination e.g., Material Description (Short Text).

Date conversion #

Convert date strings
Converts the character-type SAP date (YYYYMMDD, e.g., 19900101) to a special date format (YYYY-MM-DD, e.g., 1990-01-01). Target data uses a real date data-type and not the string data-type to store dates.

Convert invalid dates to
If an SAP date cannot be converted to a valid date format, the invalid date is converted to the entered value. NULL is supported as a value.

When converting the SAP date the two special cases 00000000 and 9999XXXX are checked at first.

Convert 00000000 to
Converts the SAP date 00000000 to the entered value.

Convert 9999XXXX to
Converts the SAP date 9999XXXX to the entered value.

Preparation - SQL Commands #

Defines the action on the target database before the data is inserted into the target table.

  • Drop & Create: Remove table if available and create new table (default).
  • Truncate Or Create: Empty table if available, otherwise create.
  • Create If Not Exists: Create table if not available.
  • Prepare Merge: Prepares the merge process and creates e.g. a temporary staging table. See merging for more details.
  • None: no action
  • Custom SQL: Here you can define your own script. See the Custom SQL section below.

If you only want to create the table in the first step and do not want to insert any data, you have two options:

  1. Copy the SQL statement and execute it directly on the target data database.
  2. Select the None option for Row Processing and execute the extraction.

Once the table is created, it is up to you to change the table definition, by, for example, creating corresponding key fields and indexes or additional fields.

Row Processing - SQL Commands #

Defines how the data is inserted into the target table.

  • Insert: Insert records (default).
  • Fill merge staging table: Insert records into the staging table.
  • None: no action.
  • Custom SQL: Here you can define your own script. See the Custom SQL section below.
  • Merge (deprecated): This option is obsolete. Please use the Fill merge staging table option and check the About Merging section.

Finalization - SQL Commands #

Defines the action on the target database after the data has been successfully inserted into the target table.

  • Finalize Merge: Closes the merge process and deletes the temporary staging table, for example.
  • None: no action (default).
  • Custom SQL: Here you can define your own script. See the Custom SQL section below.

About Merging

Merging ensures delta processing: new records are inserted into the database and / or existing records are updated. See section merging data.

Custom SQL #

Custom SQL option allows creating user-defined SQL or script expressions. Existing SQL commands can be used as templates:

  1. Within subsection e.g., Preparation select the Custom SQL (1) option from the drop-down list.
  2. Click [Edit SQL]. The dialogue “Edit SQL” opens. Formula-ExistsTable
  3. Navigate to the drop-down menu and select an existing command (3).
  4. Click [Generate Statement]. A new statement is generated. Formula-ExistsTable
  5. Click [Copy] to copy the statement to the clipboard.
  6. Click [OK] to confirm.

Check out the Microsoft SQL Server example for details on predefined expressions.

Note: The custom SQL code is used for SQL Server destinations. A syntactic adaptation of the code is necessary to use the custom SQL code for other database destinations.

Templates

You can write your user-defined SQL expressions and adapt the loading of the data to your needs.
You can additionally execute stored procedures that exist in the database. To do so, use the SQL templates provided in the following phases:

  • Preparation (e.g., Drop & Create or Create if Not Exists)
  • Row Processing (e.g., Insert or Merge)
  • Finalization
Script Expressions

You can use script expressions for the Custom SQL commands.

SQL-Skript
#{
   iif
   (
      ExistsTable("MAKT"),
      "TRUNCATE TABLE \"MAKT\";",
      "
         CREATE TABLE \"MAKT\"(
            \"MATNR\" VARCHAR(18),
            \"SPRAS\" VARCHAR(2),
            \"MAKTX\" VARCHAR(40));
      "
   )
}#

Tip: ExistsTable(tableName) command allows to verify the existence of a table in a database.

Transaction style #

Note: The available options for Transaction Style vary depending on the destination .

One Transaction
Preparation, Row Processing and Finalization are all performed in a single transaction.
Advantage: clean rollback of all changes.
Disadvantage: possibly extensive locking during the entire extraction period.

Three Transactions
Preparation, Row Processing and Finalization are each executed in a separate transaction.
Advantage: clean rollback of the individual sections, possibly shorter locking phases than with One Transaction (e.g. with DDL in Preparation, the entire DB is only locked during preparation and not for the entire extraction duration).
Disadvantage: No rollback of previous step possible (error in Row Processing only rolls back changes from Row Processing, but not Preparation).

RowProcessingOnly
Only Row Processing is executed in a transaction. Preparation and Finalization without an explicit transaction (implicit commits).
Advantage: DDL in ‘Preparation* and Finalization for DMBS that do not allow DDL in explicit transactions (e.g. AzureDWH)
Disadvantage: No rollback of Preparation/Finalization.

No Transaction
No explicit transactions.
Advantage: No transaction management required by DBMS (locking, DB transaction log, etc.). This means no locking and possible performance advantages.
Disadvantage: No rollback

Merging Data #

The following example depicts the update of the existing data records in a database by running an extraction to merge data. Merging in this case stands for changing a value of a field or inserting a new data row or updating an existing record.

Alternatively to merging, the data can be also updated by means of full load. The full load method is less efficient and performant.

Prerequisite for merging is a table with existing data, in which new data should be merged.

Ideally, the table with existing data is created in the initial load with the corresponding Preparation option and filled with data with the Row Processing option Insert.

Warning! Faulty merge
A primary key is a prerequisite for a merge command. If no primary key is set, the merge command runs into an error. Create an appropriate primary key in the General Settings to execute the merge command.

Updated record in SAP #

A field value within an SAP table is updated. With a merge command the updated value is written to the destination database table. Update-Merge-Example-Data

The merge command ensures delta processing: new records are inserted into the database and / or existing records are updated.

Merge command in Xtract Universal #

The merge process is performed using a staging table and takes place in three steps. In the first step, a temporary table is created in which the data is inserted in the second step. In the third step, the temporary table is merged with the target table and then the temporary table is deleted.

  1. In the main window of the Designer, select the respective extraction and click [Destination]. The window “Destination Settings” opens.
  2. Make sure to choose the correct destination: a database destination.
  3. Navigate to the right part of the “Destination Settings” window and apply the following settings:
    • Preparation: Prepare Merge to create a temporary staging table
    • Row Processing: Fill merge staging table to add data to the staging table
    • Finalization: Finalize Merge to merge the staging table with the target table and then delete the staging table. Extraction-Specific-Settings-Merge-Makt

More information about the updated fields can be found in the SQL statement (Custom SQL only).
It is possible to edit the SQL statement if necessary, e.g., to exclude certain columns from the update.
Fields that do not appear in the SQL statement are not affected by changes.