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Check if mysql error php

Check that you are calling mysql_ error( ) and mysql_ errno( ) BEFORE you call mysql_ close( ). 接続状況をチェックします * / if ( $ mysqli- > connect_ errno) {. This doesn' t tell us that there has been an error with the sql used. If you pass an update. throw new Exception( " MySQL error $ mysqli- > error < br> Query: < br> $ query", $ msqli- > errno) ;. mysql_ query function is used for executing mysql query in php. mysql_ query returns false if query execution fails. In above code snippet if query execution fails then it will terminate the execution and display mysql error. php $ con= mysqli_ connect( " localhost", " my_ user", " my_ password", " my_ db" ) ; / / Check connection if ( mysqli_ connect_ errno( ) ) { echo " Failed to connect to MySQL : ". mysqli_ connect_ error( ) ; } / / Perform a query, check for error. I' m looking for the best way to check and see if any results were returned in a query. OP assuming query is not returning any error, so this should be one of the way. mysql_ num_ rows will return false if $ result is invalid php. net/ manual/ en/ function. mysql- num- rows.

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    Check error mysql

    php – shady Nov 26 ' 10 at 15: 50. if ( mysql_ num_ rows( $ result) = = 0) { PERFORM ACTION }. This gets my vote. OP assuming query is not returning any error, so this should be one of the ' s very useful to see your query in order to detect problems with syntax. Most often, the output message from MySQL doesn' t let you see enough of the query in the error message to let you see where your query went bad- it a missing quote,. Assuming that I had made some gargantuan error, I went and I ran some benchmarks, and this is what I found that my solution is over 10% faster than the nearest alternative when the table does not exist, and it over 25% faster when the e this: mysqli_ query( $ this- > db_ link, $ query) or die( mysqli_ error( $ this- > db_ link ) ) ; # mysqli_ query( $ link, $ query) returns 0 if there' s an error. # mysqli_ error( $ link) returns a string with the last error message. You can also use. if ( $ result = = = false) { / / And error has occured while executing / / the SQL query }. You can check how many rows MySQL has inserted/ updated/ deleted by doing this query right after your insert/ update/ delete query.