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$result=mysql_query($query),The purpose of this function is to execute a correct SQL statement. If it is a simple query such as insert, update, delete, it will not return the result.

And $result will be either 1 or “(that is, nothing). Although online data says that the return is TRUE or FALSE, it has been proved by practice that the return is 1 or nothing.

For queries that return records, such as select, sho, explain, etc., a resource link to the query result will be returned. If the query is invalid, there will be nothing.

The judgement statement should be written as follows:

#sqlStatement successfully executed
#sqlStatements that fail to execute




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