Field mappings files contain source-to-target field/column mappings for export and import operations. Use them whenever you need the same field mappings to be used more than once.
You can create a field mappings file in Exportizer Export window, at Field Mappings step, or manually using any text editor.
Exportizer supports two formats of field mappings files: XML (recommended) and plain text (obsolete).
XML format
This format is flexible and extendable and therefore is recommended to use whenever possible.
Such field mappings files can be created either in the Export dialog on the Field Mappings step or manually using a text editor. When creating the files manually please note that they must conform to XML standards and contain byte order marks (BOM) at the beginning if needed.
The file contains an optional common part and a series of field mappings. The common part may include some technical information like application name and version, and key fields for special cases of exporting data to databases and SQL script.
Each mapping must contain 2 parts: source and target. The source part must contain a FieldName attribute with the physical name of the source field (In Exportizer Pro and Exportizer Enterprise, dynamic expression can be used instead). The target part can have a variable number of attributes (either FieldName or FileName or both must be filled):
FieldName
Specifies the physical name of the target field (column).
Target formats: All
FieldType
Specifies the type of the target field (column). For SQL databases, it should be a SQL type supported by the target database. For non-SQL databases (e.g. ASCII text tables) it should be a type supported by the target database. This attribute is used in Exportizer Pro and Exportizer Enterprise only.
Target formats: Database, SQL
FieldSize
Specifies the maximum number of characters for text fields (columns) or total number of digits for fields (columns) holding floating-point numbers. This attribute is used in Exportizer Pro and Exportizer Enterprise only.
Target formats: Database, SQL
FieldScale
Specifies the scale (number of digits to the right of the decimal point) for fields (columns) holding floating-point numbers. This attribute is used in Exportizer Pro and Exportizer Enterprise only.
Target formats: Database, SQL
FieldNotNull
A value of 1 means that the field will NOT accept NULL values. This attribute is used in Exportizer Pro and Exportizer Enterprise only.
Target formats: Database, SQL
FieldDefaultValue
Specifies the default value for the field. This attribute is used in Exportizer Pro and Exportizer Enterprise only.
Target formats: Database, SQL
PrimaryKey
Specifies whether the field is a part of the primary key or not.
Target formats: Database, SQL
FieldSQLSpecification
Specifies full SQL specification of the field (without field name). This attribute is used in Exportizer Pro and Exportizer Enterprise only. See example below.
Target formats: Database, SQL
FieldDescription
Specifies the column description/comment (currently, Oracle, SQL Server, PostgreSQL, and MySQL databases only).
Target formats: Database, SQL
FileName
Specifies path of file to store contents of the source field. If not empty, the contents of the source field will be saved into a separate file specified by this attribute. The target folder must exist. The file path should be a dynamic expression returning a unique file name, otherwise the file will be overwritten for each exported record. For database images, the file extension will define the target image format, so it is possible to convert the image format. This attribute can be used in Exportizer Pro and Exportizer Enterprise only. See example below.
Target formats: All
Attention! There are no overwrite prompts for these files.
TotalsExpression
Specifies expression the result of which should be shown in the target file after exporting all source records. It can be a dynamic or constant expression. This attribute can be used in Exportizer Pro and Exportizer Enterprise only.
Target formats: All, except Database, SQL, DBF
Example
Example of the Access-to-Oracle field mappings file in XML format:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Source-to-Target mappings for Payments aggregation -->
<FieldMappings>
<Software>Exportizer Enterprise</Software>
<KeyFields>PAYMENT_ID</KeyFields>
<Items>
<FieldMapping>
<Source>
<FieldName>PaymentId</FieldName>
</Source>
<Target>
<FieldName>PAYMENT_ID</FieldName>
<FieldType>INTEGER</FieldType>
<PrimaryKey>1</PrimaryKey>
</Target>
</FieldMapping>
<FieldMapping>
<Source>
<FieldName>Department</FieldName>
</Source>
<Target>
<FieldName>DEPARTMENT</FieldName>
<FieldType>VARCHAR2</FieldType>
<FieldSize>20</FieldSize>
<FieldDescription>Department Name</FieldDescription>
</Target>
</FieldMapping>
<FieldMapping>
<Source>
<FieldName>ActualityDate</FieldName>
</Source>
<Target>
<FieldName>ACTUALITY_DATE</FieldName>
<FieldType>DATE</FieldType>
<FieldDescription>Date of Payment</FieldDescription>
</Target>
</FieldMapping>
<FieldMapping>
<Source>
<FieldName>PaymentSum</FieldName>
</Source>
<Target>
<FieldName>PAYMENT_SUM</FieldName>
<FieldType>NUMBER</FieldType>
<FieldSize>12</FieldSize>
<FieldScale>2</FieldScale>
<FieldDescription>Payment Amount</FieldDescription>
</Target>
</FieldMapping>
<FieldMapping>
<Source>
<!-- dynamic expressions are possible: -->
<FieldName>vle_expr(0.1 * dataset_field_val(1, 'PaymentSum'))</FieldName>
</Source>
<Target>
<FieldName>COMMISSION_SUM</FieldName>
<FieldType>NUMBER</FieldType>
<FieldSize>12</FieldSize>
<FieldScale>2</FieldScale>
<FieldDefaultValue>0</FieldDefaultValue>
<FieldSQLSpecification>NUMBER(12, 2) DEFAULT 0</FieldSQLSpecification>
<FieldDescription>Commission Amount</FieldDescription>
</Target>
</FieldMapping>
<FieldMapping>
<Source>
<FieldName>Notes</FieldName>
</Source>
<Target>
<FieldName>NOTES</FieldName>
<FieldType>VARCHAR2</FieldType>
<FieldSize>400</FieldSize>
<FieldSQLSpecification>VARCHAR2(400)</FieldSQLSpecification>
<FieldDescription>Notes regarding the payment</FieldDescription>
<!-- here, we use value of the unique PaymentId field to ensure we get a unique file path for each record: -->
<FileName>vle_expr(extract_file_path(target_file_name(1)) + 'notes' + to_string(dataset_field_val(1, 'PaymentId')) + '.txt')</FileName>
</Target>
</FieldMapping>
</Items>
</FieldMappings>Text format
Such files consist of series of SourceFieldName=TargetFieldName pairs, one mapping per line. It is recommended that field names not contain equal signs. In Exportizer Pro and Exportizer Enterprise, dynamic expressions can be used instead of source field names (see example below). Lines with a semicolon at the beginning are ignored as comments. Blank lines are allowed.
Such files can have any extension and can be created in any text editor. When creating the files please include byte order marks at the beginning if needed.
Example
Example of the field mappings file in text format:
;Source-to-Target mappings for Payments exporting
Department=DEPARTMENT
ActualityDate=ACTUALITY_DATE
PaymentCount=PAYMENT_COUNT
PaymentSum=PAYMENT_SUM
;dynamic expressions are possible:
vle_expr(0.1 * dataset_field_val(1, 'PaymentSum'))=COMMISSION_SUM