Databases :: MySql :: fetch current rec's AutoNumber ID |
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By: iluilyas  |
Date: 16/03/2003 00:00:00  |
Points: 50 | Status: Answered Quality : Excellent |
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Hi list Can anybody tell me how to get the record ID of a newly added record after updating the recordset ? With MS Access as back end for our web application we used to do rs.Open "SELECT * FROM table WHERE ID = -1) rs.AddNew rs("field1") = value1 rs("field2") = value2 etc rs.Update newID = rs("ID") But this doesn't seem to work with MySQL (4.0.11) and MyODBC (3.51.06) Any ideas ? Thanks ILyas |
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| By: VGR | Date: 16/03/2003 02:09:00 | |
Type : Answer |
| you can issue a (mySql) query "select last_insert_id();" Other possibility : query for the same set of fields'values that were inserted, or on a combination of them the smallest possible that should be unique. MySql doc' : LAST_INSERT_ID([expr]) Returns the last automatically generated value that was inserted into an AUTO_INCREMENT column. See section 8.4.3.130 mysql_insert_id(). mysql> SELECT LAST_INSERT_ID(); -> 195 The last ID that was generated is maintained in the server on a per-connection basis. It will not be changed by another client. It will not even be changed if you update another AUTO_INCREMENT column with a non-magic value (that is, a value that is not NULL and not 0). If you insert many rows at the same time with an insert statement, LAST_INSERT_ID() returns the value for the first inserted row. The reason for this is to make it possible to easily reproduce the same INSERT statement against some other server. If expr is given as an argument to LAST_INSERT_ID(), then the value of the argument is returned by the function, and is set as the next value to be returned by LAST_INSERT_ID(). This can be used to simulate sequences: First create the table: mysql> CREATE TABLE sequence (id INT NOT NULL); mysql> INSERT INTO sequence VALUES (0); Then the table can be used to generate sequence numbers like this: mysql> UPDATE sequence SET id=LAST_INSERT_ID(id+1); You can generate sequences without calling LAST_INSERT_ID(), but the utility of using the function this way is that the ID value is maintained in the server as the last automatically generated value (multi-user safe). You can retrieve the new ID as you would read any normal AUTO_INCREMENT value in MySQL. For example, LAST_INSERT_ID() (without an argument) will return the new ID. The C API function mysql_insert_id() can also be used to get the value. Note that as mysql_insert_id() is only updated after INSERT and UPDATE statements, so you can't use the C API function to retrieve the value for LAST_INSERT_ID(expr) after executing other SQL statements like SELECT or SET. <A HREF="http://www.mysql.com/doc/en/Miscellaneous_functions.html">http://www.mysql.com/doc/en/Miscellaneous_functions.html</A> |
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| By: sumotimor | Date: 16/03/2003 17:09:00 | |
Type : Assist |
| SELECT LAST_INSERT_ID() will do the job, but it's evident that one has to use an extra query. if you're connecting it with PHP, you can use a simple function mysql_insert_id() for getting last inserted ID in a PHP program. |
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