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The schema manager in MDB2 allows you to get your database automatically altered when your application is run the first knstall in an updated version, so you don’t have to worry about that during installation.
How to Install PEAR in a WAMP – Ed Chen Logic
After that, the two limitation parameters follow. Now, we’ll take a look at the database management functions, which are most interesting when talking about application deployment.
Path to CLI php. The manager is a MDB2 module similar to the “Extended” one we used in the second example, with the difference being that it does not enhance the facilities of the database driver we currently use, but rather creates a new object, the manager line Sign up using Email and Password.
The call to createIndex is very simple, as well.
If the backup does not match the new one, the manager computes the difference between both and issues the necessary ALTER statements. It defines the structure of elements and mxb2 in a manner similar to that of the manager arrays in the second example. All examples are available in the sample code download. Temporary directory for downloads: Initially, this example script looks just like the previous one.
But even when you do not plan to distribute your application for different database backends, abstraction makes sense. Here is an example to install PEAR in a wamp server: Note that if the column used does not have a indtall index on it, later values will overwrite earlier ones.
Package Information: MDB2
But at line 26, we load some more advanced functionality into our database driver. If you have problems installing PEAR or getting the installer to work, the installer commands pear config-show and pear config-set are your friends.
Furthermore, a user name and, in most cases, a password are required. When no inetall file is found, the manager assumes that the table does not exist yet and that it has to be created. Every time the program reaches this code, the two schema files are compared.
Starting to download MDB In the case of Oracle, hostspec is a local connection identifier. Sign up using Facebook. Basic elements you need to have are “hostspec,” which is usually the database host to connect to, and “phptype,” the type of database e. This is one of the best features in MDB2: Of course, this solution is among the most common of database features, but, in a way, this is the cost of abstraction.
Each of the database drivers reside in its own subpackage.
DeployPHP Series, Part 4: Using the PEAR::MDB2 Database Abstraction Layer with Oracle
The commented code uses the default fetch mode where the fields of the returned array are numbered. This kind of abstraction is highly recommended when your developers have to deal with different databases. Conclusion You should now have good working knowledge of MDB2. Note that I have intentionally left out some features here, such as MDB2’s data type abstraction—and with it the possibility to automatically casting datatypes in PHP e.