Error updating database php mysql
To update a record in any table it is required to locate that record by using a conditional clause.Below example uses primary key to match a record in employee table.By default, the output from your queries will be in order of the id field, going from 1 upwards. For example, a useful sort would be to place all the users in alphabetical order based on their last name. To do this you would use the following query: The value you have assigned to $num is very imiportant as, apart from error trapping and loops, it has many other uses.For those not familiar with standard databases, this would be in Ascending order as it goes from A to Z. An example of this would be to print out only the last 5 records added to a database.Firstly, they would need to be placed into order based on the id field (as the one with the latest ID would have been added last. Now you have them in order of newest to oldest but this does not restrict the script to only showing the first 5.To do this, you would need to set your loop to run to 5 instead of $num (as this would only run the loop 5 times so only 5 records would be output).Using this method of choosing a record using the URL to select the record can be expanded further by generating the URL dynamically. In the contacts script we are writing, I will be showing you how to create an Update page where the user can update the contact details.To do this, another column will be included in the output column, with an Update link in it.
Below is a simple example to update records into employee table.If you had followed this, never had your question looked like this.We basically want crud operation(create,read,update,delete) on the same page create a table we use create query , as we enter the data in the table, that data will be displayed in tabular form on the same page Showing the available options such as edit ,delete in front of them.As I expalined before, this will set the value of $num as the number of rows in the result (and it was used in a loop in part 4).Because of this you can make a simple error trap using an IF statement: Not only can you output data based on the contents of a field, but you can also order the output based on a field (for example placing users in alphabetical order).