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my $sql = "
 LOCK TABLE tabreserves IN SHARE MODE;
...
   AND (fk_idfield = ? OR ? = ANY (imped))
  LIMIT 1
";

DBD::Pg::st execute failed: ERROR:  cannot insert multiple commands in
+to a prepared statement

DBD::Pg::st execute failed: ERROR:  column "hour_i" is of type integer
+ but expression is of type character varying
HINT:  You will need to rewrite or cast the expression.