If no INTO clause is specified, the query results are discarded. If no rows are returned, NULL is assigned to the INTO variable(s). If multiple rows are returned, only the first will be assigned to the INTO variable.
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If a row or variable list is provided, it must exactly match the structure of the query’s results (when a record variable is used, it will configure itself to match the result structure automatically). The INTO clause specifies where the results of a SQL command returning rows should be assigned.Any required variable values must be inserted in the command string as it is constructed.The command is always planned each time the statements are running. There is no plan caching for commands executed via EXECUTE.Supply values to be inserted into the command. Is a record variable, row variable or a comma-separated list of simple variables and record/row fields, into which the results of the command will be stored. command-string is an expression that contains que query to be executed.EXECUTE command it is used when the function involves different tables or different data types each time that the function is executed.ĮXECUTE command - string target ] ] The EXECUTE coommand it is used to generate dynamic commands inside the PL/pgSQL function.
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In order to write dynamic PL/pgSQL queries the EXECUTE 'sql' is used. It is important to control transactions to ensure data integrity and to handle database errors. A transaction is the propagation of one or more changes to the database.įor example, if you are creating or updating or deleting a record from the table, then you are performing transaction on the table.
#Pgadmin 4 no result on query manual
Transactions are units or sequences of work accomplished in a logical order, whether in a manual fashion by a user or automatically by some sort of a database program. If the level is not specified, the defaults level will be EXCEPTION that raises an error and stops the current transaction.Ī transaction is a unit of work that is performed against a database. The configuration of these error messages are controlled by the client_min_messages and log_min_messages configuration parameters. The error RAISE LOG and RAISE DEBUG error messages are not returned in the client side, that’s because those messages are not showed to the client by default, they areĭisplayed in the server side. To call the created function you could use: The function has a result that changes the result even when you write the same input values. IMMUTABLE: The function ensures the same result (it caches it) if the same value is put as an input arguments.The function is not evaluated and returns a NULL value. STRICT: write STRICT when the input arguments have NULL values.The conditions can be STRICT, IMMUTABLE or VOLATILE. Indicate the procedural language of the function.
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