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DBLINK_BUILD_SQL_INSERT

Section: Postgres-XL 9.2 Documentation (3)
Updated: 2014-04-30
Index

NAME

dblink_build_sql_insert - builds an INSERT statement using a local tuple, replacing the primary key field values with alternative supplied values

SYNOPSIS

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

DESCRIPTION

Note

The following description applies only toPostgres-XL

dblinkmodule has not been tested withPostges-XLyet. Although there're no reason thatdblinkdoes not run inPostgres-XL, the development team leaves the test and the use of this module entirely to users.

This section is identical to the correspondingPostgreSQLreference manual.

Note

The following description applies only toPostgreSQL

dblink_build_sql_insertcan be useful in doing selective replication of a local table to a remote database. It selects a row from the local table based on primary key, and then builds a SQLINSERTcommand that will duplicate that row, but with the primary key values replaced by the values in the last argument. (To make an exact copy of the row, just specify the same values for the last two arguments.)

ARGUMENTS

Note

The following description applies only toPostgreSQL

relname

: Name of a local relation, for examplefooormyschema.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.

primary_key_attnums

: Attribute numbers (1-based) of the primary key fields, for example1 2.

num_primary_key_atts

: The number of primary key fields.

src_pk_att_vals_array

: Values of the primary key fields to be used to look up the local tuple. Each field is represented in text form. An error is thrown if there is no local row with these primary key values.

tgt_pk_att_vals_array

: Values of the primary key fields to be placed in the resultingINSERTcommand. Each field is represented in text form.

RETURN VALUE

Note

The following description applies only toPostgreSQL

Returns the requested SQL statement as text.

NOTES

Note

The following description applies only toPostgreSQL

As ofPostgreSQL9.0, the attribute numbers inprimary_key_attnumsare interpreted as logical column numbers, corresponding to the column's position inSELECT * 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.

EXAMPLE

Note

The following description applies only toPostgreSQL

SELECT dblink_build_sql_insert('foo', '1 2', 2, '{"1", "a"}', '{"1", "b''a"}');             dblink_build_sql_insert-------------------------------------------------- INSERT INTO foo(f1,f2,f3) VALUES('1','b''a','1')(1 row)

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