.create-or-alter ingestion mapping command

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Applies to: ✅ Azure Data Explorer

Creates or alters an ingestion mapping that can be associated with a specific format and a specific table or database.

If the ingestion mapping doesn't exist, the command will create it. If the ingestion mapping already exists, the command will modify it.

Note

New columns introduced in an ingestion mapping, which aren't present in the source table, will be added to the table during the initial data ingestion for that column. This behavior is only supported for queued ingestion and is contingent on specifying a valid data type for the column.

Permissions

At least Database Ingestor permissions are required to create a database ingestion mapping, and at least Table Ingestor permissions are required to create a table ingestion mapping.

Syntax

.create-or-alter table TableName ingestion MappingKind mapping MappingName MappingFormattedAsJson

.create-or-alter database DatabaseName ingestion MappingKind mapping MappingName MappingFormattedAsJson

Learn more about syntax conventions.

Parameters

Name Type Required Description
TableName string ✔️ The name of the table.
DatabaseName string ✔️ The name of the database.
MappingKind string ✔️ The type of mapping. Valid values are CSV, JSON, avro, parquet, and orc.
MappingName string ✔️ The name of the mapping.
MappingFormattedAsJson string ✔️ The ingestion mapping definition formatted as a JSON value.

Note

  • Once created, the mapping can be referenced by its name in ingestion commands, instead of specifying the complete mapping as part of the command.
  • If a mapping with the same name is created in both the table scope and the database scope, the mapping in the table scope will have a higher priority.
  • When ingesting into a table and referencing a mapping whose schema does not match the ingested table schema, the ingest operation will fail.

Example

.create table MyTable ingestion csv mapping "Mapping1"
'['
'   { "column" : "rownumber", "DataType":"int", "Properties":{"Ordinal":"0"}},'
'   { "column" : "rowguid", "DataType":"string", "Properties":{"Ordinal":"1"}}'
']'

.create-or-alter table MyTable ingestion json mapping "Mapping1"
'['
'    { "column" : "rownumber", "datatype" : "int", "Properties":{"Path":"$.rownumber"}},'
'    { "column" : "rowguid", "Properties":{"Path":"$.rowguid"}}'
']'

Output

Name Kind Mapping Database Table
mapping1 JSON [{"Properties":{"Path":"$.rownumber"},"column":"rownumber","datatype":"int"},{"Properties":{"Path":"$.rowguid"},"column":"rowguid","datatype":""}] MyDatabase MyTable

Related content

  • For detailed descriptions of various ingestion mapping formats such as CSV, JSON, Avro, Parquet, and Orc, see Data mappings.