dblink_build_sql_delete (original) (raw)

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dblink_build_sql_delete — builds a DELETE statement using supplied values for primary key field values

Synopsis

dblink_build_sql_delete(text relname, int2vector primary_key_attnums, integer num_primary_key_atts, text[] tgt_pk_att_vals_array) returns text

Description

dblink_build_sql_delete can be useful in doing selective replication of a local table to a remote database. It builds a SQL DELETE command that will delete the row with the given primary key values.

Arguments

relname

Name of a local relation, for example foo or myschema.mytab. Include double quotes if the name is mixed-case or contains special characters, for example "FooBar"; without quotes, the string will be folded to lower case.

primarykeyattnums

Attribute numbers (1-based) of the primary key fields, for example 1 2.

numprimarykeyatts

The number of primary key fields.

tgtpkattvalsarray

Values of the primary key fields to be used in the resulting DELETE command. Each field is represented in text form.

Return Value

Returns the requested SQL statement as text.

Notes

As of PostgreSQL 9.0, the attribute numbers in primarykeyattnums are interpreted as logical column numbers, corresponding to the column's position in SELECT * FROM relname. Previous versions interpreted the numbers as physical column positions. There is a difference if any column(s) to the left of the indicated column have been dropped during the lifetime of the table.

Examples

SELECT dblink_build_sql_delete('"MyFoo"', '1 2', 2, '{"1", "b"}'); dblink_build_sql_delete

DELETE FROM "MyFoo" WHERE f1='1' AND f2='b' (1 row)