README.md

PRESTO-QUERY-BUILDER

This library allows you to programmatically generate queries for Presto to enable dynamically generated queries.

Features:

SELECT

• Union
• With
• Where
• Order By
• Group By
• Join

INSERT

• Mult-row inserts

DELETE

• Where

Configuration

None required.

Usage

Select:

QueryFactory qf = new QueryFactory();
String query = qf.build(
    new SelectQueryBuilder(
    ).with(
        "with_table"
    ).select(
        false,
        projection("aliasa", ref("alias.a"))
    ).from(
        aliasedTable("alias", "b")
    ).end(
    ).select(
        false,
        projection("t1a", ref("t1.a")),
        projection("t2aliasa", ref("t2.aliasa"))
    )
    .from(
        aliasedTable("t1", "a")
    )
    .join(
        INNER,
        aliasedTable("t2", "with_table"),
        equal(ref("t1.a"), ref("t2.aliasa"))
    )
);

Insert:

QueryFactory qf = new QueryFactory();
qf.setParam("a", lit(1));
qf.setParam("b", lit(2));
qf.setParam("c", lit(3));

String query = qf.build(
    new InsertQueryBuilder(
    ).into(
        qualifiedName("t1"),
        Arrays.asList(
            identifier("a"),
            identifier("b"),
            identifier("c")
        )
    ).row(
    ).value(
        "a",
        QueryUtils.param(qf, "a")
    ).value(
        "b",
        QueryUtils.param(qf, "b")
    ).value(
        "c",
        QueryUtils.param(qf, "c")
    ).end()
);

Delete:

QueryFactory qf = new QueryFactory();
qf.setParam("a", lit(1));

String query = qf.build(
    new DeleteQueryBuilder(
    ).from(
        table("t")
    ).where(
        equal(ref("a"), QueryUtils.param(qf, "a"))
    )
);

Special Notes

• Currently, this is pinned to Presto 0.227 but could probably be used with newer versions as well.
• Most Presto connectors do not support INSERT and/or DELETE operations so the are not very feature rich.
• Since you can always DELETE then INSERT, UPDATE was not prioritized. However, it's still on the TODO list.

TODO

• add more tests
• query builder for update queries