Michael Pigott created ARROW-4144:
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Summary: [Java] Arrow-to-JDBC
Key: ARROW-4144
URL: https://issues.apache.org/jira/browse/ARROW-4144
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Michael Pigott
ARROW-1780 reads a query from a JDBC data source and converts the ResultSet to
an Arrow VectorSchemaRoot. However, there is no built-in adapter for writing
an Arrow VectorSchemaRoot back to the database.
ARROW-3966 adds JDBC field metadata:
* The Catalog Name
* The Table Name
* The Field Name
* The Field Type
We can use this information to ask for the field information from the database
via the
[DatabaseMetaData|https://docs.oracle.com/javase/7/docs/api/java/sql/DatabaseMetaData.html]
object. We can then create INSERT or UPDATE statements based on the [list of
primary
keys|https://docs.oracle.com/javase/7/docs/api/java/sql/DatabaseMetaData.html#getPrimaryKeys(java.lang.String,%20java.lang.String,%20java.lang.String)]
in the table:
* If the value in the VectorSchemaRoot corresponding to the primary key is
NULL, insert that record into the database.
* If the value in the VectorSchemaRoot corresponding to the primary key is not
NULL, update the existing record in the database.
We can also perform the same data conversion in reverse based on the field
types queried from the database.
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