| PostgreSQL 8.4.22 Documentation | ||||
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dblink_build_sql_update(text relname,
int2vector primary_key_attnums,
int2 num_primary_key_atts,
text[] src_pk_att_vals_array,
text[] tgt_pk_att_vals_array) returns text
dblink_build_sql_update can 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 SQL UPDATE command 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.) The UPDATE command always assigns all fields of the
row — the main difference between this and dblink_build_sql_insert is that it's assumed
that the target row already exists in the remote table.
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.
Attribute numbers (1-based) of the primary key fields, for example 1 2.
The number of primary key fields.
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.
Values of the primary key fields to be placed in the resulting UPDATE command. Each field is represented in text form.