replace()
     * Execute a SQL REPLACE query. A REPLACE query is identical to a
INSERT
     * query, except that if there is already a row in the table with
the same
     * key field values, the REPLACE query just updates its values
instead of
     * inserting a new row.
     *
     * The REPLACE type of query does not make part of the SQL
standards. Since
     * practically only MySQL and SQLIte implement it natively, this
type of
     * query isemulated through this method for other DBMS using
standard types
     * of queries inside a transaction to assure the atomicity of the
operation.
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