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ResultSet fetching
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
When interacting with legacy applications, you may prefer to have jOOQ return a java.sql.ResultSet, rather than jOOQ's own org.jooq.Result types. This can be done simply, in two ways:
// jOOQ's Cursor type exposes the underlying ResultSet: ResultSet rs1 = create.selectFrom(BOOK).fetchLazy().resultSet(); // But you can also directly access that ResultSet from ResultQuery: ResultSet rs2 = create.selectFrom(BOOK).fetchResultSet(); // Don't forget to close these, though! rs1.close(); rs2.close();
Transform jOOQ's Result into a JDBC ResultSet
Instead of operating on a JDBC ResultSet holding an open resource from your database, you can also let jOOQ's org.jooq.Result wrap itself in a java.sql.ResultSet. The advantage of this is that the so-created ResultSet has no open connection to the database. It is a completely in-memory ResultSet:
// Transform a jOOQ Result into a ResultSet Result<BookRecord> result = create.selectFrom(BOOK).fetch(); ResultSet rs = result.intoResultSet();
The inverse: Fetch data from a legacy ResultSet using jOOQ
The inverse of the above is possible too. Maybe, a legacy part of your application produces JDBC java.sql.ResultSet, and you want to turn them into a org.jooq.Result:
// Transform a JDBC ResultSet into a jOOQ Result
ResultSet rs = connection.createStatement().executeQuery("SELECT * FROM BOOK");
// As a Result:
Result<Record> result = create.fetch(rs);
// As a Cursor
Cursor<Record> cursor = create.fetchLazy(rs);
You can also tighten the interaction with jOOQ's data type system and data type conversion features, by passing the record type to the above fetch methods:
// Pass an array of types: Result<Record> result = create.fetch (rs, Integer.class, String.class); Cursor<Record> result = create.fetchLazy(rs, Integer.class, String.class); // Pass an array of data types: Result<Record> result = create.fetch (rs, INTEGER, VARCHAR); Cursor<Record> result = create.fetchLazy(rs, INTEGER, VARCHAR); // Pass an array of fields: Result<Record> result = create.fetch (rs, BOOK.ID, BOOK.TITLE); Cursor<Record> result = create.fetchLazy(rs, BOOK.ID, BOOK.TITLE);
If supplied, the additional information is used to override the information obtained from the ResultSet's java.sql.ResultSetMetaData information.
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