Bitcoin code igniter active record
Well, at this point you have hopefully grasped how to perform a simple conditional SQL statement by using the database class that comes included with Code Igniter. That being said, here is its signature:. Therefore, keeping in mind this concept, below I created such a class, which looks like this:. Naturally, performing a conditional SQL clause like this one is pretty trivial, but it demonstrates in a nutshell how to use the active record pattern with Code Igniter. It consists merely of defining the view file that will display the values of these table rows on the browser.
Yet this practical example should give you a clear idea of how to execute conditionals SQL statements using the active record pattern. However, if you wish to examine a full reference of them, the best place to go is its official web site. In this sixth episode of the series, I provided you with a quick overview on selecting database records through the active record pattern. Below I included the output generated by the previous view file. User List Full Name: Want to see how this will be done?
Then click on the below link and read the next few lines. Based on its structure, below I redefined the corresponding model, so now it looks like this: The signature of the controller class that performs this task is as following: This pattern allows information to be retrieved, inserted, and updated in your database with minimal scripting. In some cases only one or two lines of code are necessary to perform a database action. CodeIgniter does not require that each database table be its own class file.
It instead provides a more simplified interface. Beyond simplicity, a major benefit to using the Query Builder features is that it allows you to create database independent applications, since the query syntax is generated by each database adapter. It also allows for safer queries, since the values are escaped automatically by the system.
If you intend to write your own queries you can disable this class in your database config file, allowing the core database library and adapter to utilize fewer resources. Runs the selection query and returns the result. Can be used by itself to retrieve all records from a table:. Please visit the result functions page for a full discussion regarding result generation. This method simply returns the SQL query as a string. This is useful if you need a compound select statement where automatic escaping of fields may break them.
You can optionally include a second parameter to rename the resulting field. If you need a specific type of JOIN you can specify it via the third parameter of the function. All values passed to this function are escaped automatically, producing safer queries. There are 2 possible syntaxes, 1 argument or If you are using a database that CodeIgniter escapes queries for, you can prevent escaping content by passing an optional third argument, and setting it to FALSE. The second parameter lets you set the direction of the result.
If you choose the RANDOM direction option, then the first parameters will be ignored, unless you specify a numeric seed value. Random ordering is not currently supported in Oracle and will default to ASC instead. Permits you to determine the number of rows in a particular Active Record query.
However, this method also resets any field values that you may have passed to select. Permits you to determine the number of rows in a particular table. Submit the table name in the first parameter. Nested groups are supported. Generates an insert string based on the data you supply, and runs the query. You can either pass an array or an object to the function. Here is an example using an array:. In our case, it will save you from the need to implement complex logics with different combinations of select , update , delete and insert calls.
Usage of the set method is also allowed and all fields are automatically escaped, just like with insert. It can be used instead of passing a data array directly to the insert or update functions: If you use multiple function called they will be assembled properly based on whether you are doing an insert or an update:.
To illustrate the difference, here is set used both with and without the escape parameter. Generates an update string and runs the query based on the data you supply.