Each subsequent call to this function will return the next row within the result set, or It's worth noting that the My SQLi functions (and, I presume, the My SQL functions) fetch a string regardless of the My SQL data type. if you fetch a row with an integer column, the corresponding value for that column and row will still be stored as a string in the array returned by mysql_fetch_row. The following functions return NULL when no more data is available in the result set (ext/mysql's functions return FALSE).
- mysqli_fetch_row() - mysqli_fetch_array() - mysqli_fetch_assoc() Remember that fetch() and fetch_row() are two different things, and differ in the way to use them.- fetch() is used on a statement (like an executed prepared statement) and needs to be used in association with bind_result().- fetch_row() is used on a result (like the result of query()).
The EXISTS method again uses a select * to check if the row exists using an IS (Intent Shared) lock followed by an IX and X Lock made by the Update.
Here the NO EXISTS is better because it doesn't need an IS (Intent Shared) lock.
Figure 1 But, what if one wants a more visible indicator such as having the entire row and column highlighted as in Figure 2 Figure 2 A variant of highlighting the entire row and column is to highlight the row to the left of the cell and the column above the cell as in Figure 3 Figure 3 Yet another possibility is to use different colored borders for the row and the column as in Figure 4 Figure 4 Another variant is to highlight a cell in a specific column and the same row as the selected cell.
The NO EXISTS method is less expensive due to only one IX and X Lock made by the Update.Moving on to problem, I'll create a table which can be used to demonstrate this (for the purposes of simplicity I’ve removed most of the columns).Here is the table creation script : The requirement is to create a query that will concatenate the values in the ‘Txt’ column into a comma separated list.As a consequence, if you want to use to use fetch_row() with an executed prepared statement, first you'll have to get the result out of this statement with mysqli_store_result() or mysqli_use_result().was a SELECT statement, some databases may return the number of rows returned by that statement.