Check Mysql Error
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Check Mysql Query Error
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Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to http://php.net/manual/en/function.mysql-error.php check if a MySQL query using the legacy API was successful? up vote 30 down vote favorite 5 How do I check if a MySQL query is successful other than using die() I'm trying to achieve... mysql_query($query); if(success){ //move file } else if(fail){ //display error } php mysql share|improve this question edited Jun 13 at 8:52 Álvaro González 80.4k19133198 asked Aug 12 '12 at 0:27 http://stackoverflow.com/questions/11918797/how-to-check-if-a-mysql-query-using-the-legacy-api-was-successful JohnSmith 3892921 add a comment| 6 Answers 6 active oldest votes up vote 50 down vote accepted This is the first example in the manual page for mysql_query: $result = mysql_query('SELECT * WHERE 1=1'); if (!$result) { die('Invalid query: ' . mysql_error()); } If you wish to use something other than die, then I'd suggest trigger_error. share|improve this answer edited Aug 12 '12 at 1:01 answered Aug 12 '12 at 0:29 Mark Byers 445k8710911191 3 Or simply if (!mysql_query('SELECT * WHERE 1=1')) { ... } –Rune Aug 12 '12 at 0:32 1 @Rune: Right, but then you won't be able to use the query resource for further actions (i.e. for fetching actual data using mysql_fetch_* functions). –Amal Murali May 21 '14 at 13:36 @AmalMurali hmm, good point. I'm not sure where I was with my head at the time of posting that comment.. –Rune May 22 '14 at 19:44 1 Use $result === false not !$result. REASON: There may be queries for which $result is a VALID (non-error) value that is equivalent to ZERO. (I think an empty string is another example.) In php, !0 e
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Mysqlcheck command checks, repairs, optimizes and analyzes the tables. 1. Check a Specific Table in a Database If your application gives an error message saying that a specific table is corrupted, execute the mysqlcheck command to check that one table. The following example checks employee table in thegeekstuff database. # mysqlcheck -c thegeekstuff employee -u root -p Enter password: thegeekstuff.employee OK You should pass the username/password to the mysqlcheck command. If not, you'll get the following error message. # mysqlcheck -c thegeekstuff employee mysqlcheck: Got error: 1045: Access denied for user 'root'@'localhost' (using password: NO) when trying to connect Please note that myisamchk command that we discussed a while back works similar to the mysqlcheck command. However, the advantage of mysqlcheck command is that it can be executed when the mysql daemon is running. So, using mysqlcheck command you can check and repair corrupted table while the database is still running. 2. Check All Tables in a Database To check all the tables in a particular database, don't specify the table name. Just specify the database name. The following example checks all the tables in the alfresco database. # mysqlcheck -c alfresco -u root -p Enter password: alfresco.JBPM_ACTION OK alfresco.JBPM_BYTEARRAY OK alfresco.JBPM_BYTEBLOCK OK alfresco.JBPM_COMMENT OK alfresco.JBPM_DECISIONCONDITIONS OK alfresco.JBPM_DELEGATION OK alfresco.JBPM_EVENT OK .. 3. Check All Tables and All Databases To check all the tables and all the databases use the "-all-databases" along with -c option as shown below. # mysqlcheck -c -u root -p --all-databases Enter password: thegeekstuff.employee OK alfresco.JBPM_ACTION OK alfresco.JBPM_BYTEARRAY OK alfresco.JBPM_BYTEBLOCK OK .. .. mysql.help_category error : Table upgrade required. Please do "REPAIR TABLE `help_category`" or dump/reload to fix it! mysql.help_keyword error : Table upgrade required. Please do "REPAIR TABLE `help_keyword`" or dump/reload to fix it! .. If you want to check all tables of few databases, specify the database names using "-databases". The following example checks all the tables in thegeekstuff and alfresco database. # mysqlcheck -c -u root -p --databases thegeekstuff alfresco Enter password: thegeekstuff.employee OK alfresco.JBPM_ACTION OK alfresco.JBPM_BYTEARRAY OK alfresco.JBPM_BYTEBLOCK OK .. 4. Analyze Tables using Mysqlcheck The following analyzes employee table that is located in thegeekstuff database. # mysqlcheck -a thegeekstuff employee -u root -p Enter password: thegeekstuff.empl