Note field names returned by this function are casesensitive. Returns an array of strings that corresponds to the fetched row, or false if there are no more rows. Then you loops, you can pull the data out of the array. The first table customerinfo contains 17 columns with customer. Hi guys, im working on creating an online survey application, but im having some trouble with one of the. A predefined constant specifying the type of array to return. Resolved function in while loop not return right results. If so, i want to grab some info from the table that corresponds to that email such as. In php, mysql fetches results can be obtained by the following functions. When it fails to get the next row, it returns false, and your loop ends.
On the next iteration of the outer while loop, however, the inner while loop will. On the next iteration of the outer while loop, however, the inner while loop will never run because its already reached the end of the result set. A better solution in terms of design is to make getlicenser return an. Ive been trying to get data from mysql table, i have used a while loop to do that. Now i know i could do this the other way around but it would really be inefficient to loop every name in the database for 1 name. Now in this tutorial, i will explain how to fetch data from mysql using php. At a time it return only the first row as an associative array or numeric array. If a field with no name is retrieved, the associative key for the array element will be an empty string. I am pulling posts form phpbb and displaying them in a script. My php page is sent a string of usernames separated by, and then turned into an array.
My problem is i am only able to display last row entered into database table. I then get all the rows in my database table and check against each name until that name is found in the datab. There are advantages and disadvantages to each type of php loop depending on the. Because of this, you can not loop through a resource result twice in the same script.
I am parsing form data with php to insert into a database table. Thats because on each iteration of the loop, the query is executed again, which means that unless the licenser table is empty, the loop will be an infinite loop. The problem is that there is so many calls going on that when i break the loop checking 1 name against the database it breaks the forloop. I know that the form data is being inserted into the table.
It returns an array of strings that corresponds to the fetched row. Returns an array that corresponds to the fetched row or null if there are no more rows for the resultset represented by the result parameter. You can use a while loop to read records returned from a database query. Hey everyone ive been working on converting my old mysql code to to the mysqli version and am running into some trouble. Dont fetch both unless you really need them, and most of the time you dont. All of these functions will fetch only one row per function call. If so, i want to grab some info from the table that corresponds to that email such as id, firstname, last name. Using foreach and while loop, for an array of a mysql. You are currently viewing the beginning php section of the wrox programmer to programmer discussions. In addition to storing the data in the numeric indices of the result array, the mysqli. Using foreach and while loop, for an array of a mysql query. This is a community of tens of thousands of software programmers and website developers including wrox book authors and readers.
You will also learn how to loop through the values of array using foreach loop at the end of this chapter. Php while, dowhile, for and foreach loops tutorial republic. Dec 19, 2011 hey everyone ive been working on converting my old mysql code to to the mysqli version and am running into some trouble. The while loop differs from the dowhile loop in one important way with a while loop, the condition to be evaluated is tested at the beginning of each loop iteration, so if the conditional expression evaluates to false, the loop will never be executed with a dowhile loop, on the other hand, the loop will always be executed once, even if the. On the first iteration of the outer while loop, the inner while loop will run until it reaches the end of the result set which apparently only contains 1 row, in your example and then stop. It is used to fetchs a result row as an associative array. So what i want to do is go through each email in the array and see if the email exists in a table of a mysql db.
To use foreach would require you have an array that contains every row from the query result. Hi the code i have written pulls in 3 rows from the database and at present puts the values into 1 array. Php mysql functions to get records of a table as an array. Im have a database with two tables in it from where id like to retrieve data.
While loops are used to execute a block of code until a certain condition becomes true. Is there any way to place them into individual arrays each. Resolved nested while loops and mysql phpbuilder forums. Oooh so it put all data in assoc array, lets say it put 5 rows of data, and the while loop loops 5 times then. However, if you are recreating an output array from a fetch loop mimicking a fetchall, then memory considerations will be similar, but will be slower. In the previous tutorial, i explained how to insert data into mysql using php. As you can see, its twice as effecient to fetch either an array or a hash, rather than getting both. Fetch a result row as a numeric array and as an associative array. Returns the next available row of data as an associative array, a numeric array, or both the default. Last id mysql insert multiple mysql prepared mysql select data mysql where mysql order by mysql delete data mysql update data mysql limit data php xml. They are used to execute a block of code a repeatedly until the set condition gets satisfied. Does anyone know how to cause the while to advance like in a for loop before completing. Php arrays and while loops php the sitepoint forums.
Returns an associative array that corresponds to the fetched row and moves the internal data pointer ahead. So im writing some background code for a app im writing and due to stubborness i am in a situation. Youre fundamentally misunderstanding how these things work. If required, we should call such functions with a loop for getting subsequent mysql fetch results row by row. While loop statement php wordwrap doesnt break at your line limit if a word has more characters than the limit. For information about how to specify the php data type, see how to.
A solution is to call getlicenser once before the loop. Loops while loop do while loop for loop foreach loop. Fieldnames returned from this function are casesensitive. Using a php while loop we can use this information to our advantage. I love the convenience of fetchall and i probably overuse it in some sites, but my datasets are quite small and site traffic is not that big. To get the value from the array we have to use array offset staring from 0.