Dynamic data import / export

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Adapter Access

The Access Adapter in FlowHeater is responsible for the direct connection to data in Microsoft Access databases. The Adapter makes it possible to import, export and update data in MDB, MDE, ACCDB and ACCDE Access databases. Support is provided for Microsoft Office Access versions 97, 2000, 2002 (XP), 2003, 2007, 2010, 2013 and 2016.

Note: Note: Microsoft Access ADP and ADE database projects are not supported by the Access Adapter; you should use the SQL Server Adapter for these instead.

Points to consider about using a 32-bit or 64-bit FlowHeater variant for Access databases

Which variant you have to use depends on your system prerequisites. In principle, FlowHeater does not require an MS Office/Access installation in order to work with Access databases.

If no Office/Access is installed, you should generally be able to process Access (.MDB) databases using the 32-bit FlowHeater variant without any problems (including on 64-bit systems). No additional driver installation is needed with this variant.

However, should you prefer to use the 64-bit FlowHeater variant without an Office/Access installation, or you need to process Access .ACCDB databases, it is necessary in these cases to install a 64-bit version of the “Microsoft Database Access Engine” driver.

If on your system there is an MS Office or Access installed then you need to use exactly the same FlowHeater variant (32-bit or 64-bit) as your Office/Access installed: For a 64-bit Office/Access installation you require the 64-bit FlowHeater variant, conversely for a 32-bit Office/Access installation you need the 32-bit FlowHeater variant, even when you are using a 64-bit operating system!

Note: Both FlowHeater variants (32-bit / 64-bit) can be installed in parallel on the same computer and chosen for use as required.

General tab

Access Adapter, database selectAccess Adapter, database selectYou specify the path (absolute or relative) to the MS Access database here. If the database is protected with a password, you can optionally enter it here. If you want to store the password it is necessary to check the "Save Password" option here. Note: The password is stored in the Definition data in encrypted form.

When the Adapter is being used on the WRITE side (right-hand side), in the lower half of this tab you can specify what actions the Access Adapter should take during an import (insert/update) into the MS Access database.

 

Common

Insert data: When this option is checked, SQL Insert statements are generated.

Ignore existing records: During an import and when this option is checked, records that already exist in the table are ignored.

Empty the table before importing: When this is checked you tell the Access Adapter to empty the contents of the table prior to running the import, effectively deleting all existing rows.

Update data: When this option is checked, SQL Update statements are generated. Note: If both the Insert and Update options are checked, the Access Adapter checks whether an SQL Update or Insert should be generated in each instance, by reference to the PrimaryKey. Tip: If you are certain there is only data to insert then avoid checking the Update option, as this will make the process significantly faster.

No updates or inserts to data, only generate an SQL script: When this option is checked, it signals the Access Adapter to make no inline changes to the database, but instead to store an SQL script with Insert and/or Update statements. This is useful for testing during development and for subsequent application to the database. If this option is checked you should also check the option below and enter the filename that the SQL statements are to be stored in.

Generate SQL script: This option instructs the Access Adapter to store the change statements (Insert, Update) as an SQL script file with the specified name and path.

Fields / Data types tab

SQL: data available varies according to the side of the Adapter in use:Access Adapter, fields and data types propertiesAccess Adapter, fields and data types properties

On the READ side: here you can choose from Tables and Views.
On the WRITE side: only Tables are available.

On the READ side you also have the possibility to enter complex SQL statements in the text field. Table joins must be defined by hand. In the second combo box the tables and views are listed that are available in the specified Access database.

Fields: When you click the Load Schema button, information is retrieved from the database schema (field names, field sizes, data types, primary key, etc.) for the SQL statement above. The information about the fields is then loaded into the field list to the left of this button.
Note: The fields in the field list can be ordered in any sequence required. Fields that are not required can either be temporarily disabled here (tick removed) or simply deleted.

Field properties: How the properties of Primary Key and Auto Increment for the currently highlighted field are to be interpreted are adjusted. This information is only required on the WRITE side. No changes are needed here generally, since the correct information is usually obtained directly from the schema.
A PrimaryKey field is used in an Update to identify record that possibly exists.
Auto Increment fields are neither assigned nor amended in Insert/Update statements.
Warning: If you make changes here it can result in more than one record being updated with an Update!

 

Data types not supported

The Access OLE Object data type is not supported by the Access Adapter. The Long Integer data type is only supported for 31 signed bits (decimal integers ranging from -2,147,483,648 to +2,147,483,647). If you do expect values that exceed this range, which is generally unusual in MS Access, you must set the data type of the respective field to Decimal in the Access Adapter manually. Note: In so doing you will probably want to zero the decimal place accuracy in the numeric format settings. For an example of this see the description of the Format Heater.

 

Adapter settings in the Format tab

The use of the Format tab is described in detail under general information about the usage of Adapters



Examples

 

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