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What does Zend _ DB _ select do in PHP?
The Zend_Db_Select object represents a SQL SELECT query statement. The class has methods for adding individual parts to the query. You can specify some parts of the query using PHP methods and data structures, and the class forms the correct SQL syntax for you.
How are filters used in the Zend Framework?
Filters transform input values, by removing or changing characters within the value. The goal is to “normalize” input values until they match an expected format. For example, if a string of numeric digits is needed, and the input value is “abc123”, then it might be a reasonable transformation to change the value to the string “123”.
Which is the best method to execute a SELECT query in Zend?
For very simple SELECT queries, it is usually simpler to specify the entire SQL query as a string and execute it using Adapter methods like query () or fetchAll (). Using Zend_Db_Select is helpful if you need to assemble a SELECT query procedurally, or based on conditional logic in your application.
What are missing fields in the Zend Framework?
Missing fields are those that are not present in the input data, but were declared with the metacommand ‘presence’=>’required’ (see the later section on metacommands). Unknown fields are those that are not declared in any rule in the array of validators, but appear in the input data.
Can a Zend query be executed as a string?
After you build a query, you can execute the query as if you had written it as a string. The value offered by Zend_Db_Select includes: Automatic quoting of metadata identifiers in most cases, to support identifiers containing SQL reserved words and special characters;
How does the class work in Zend Framework?
The class has methods for adding individual parts to the query. You can specify some parts of the query using PHP methods and data structures, and the class forms the correct SQL syntax for you. After you build a query, you can execute the query as if you had written it as a string.
What’s the difference between Zend DB select and Expr?
Zend_Db_Expr is a minimal class that contains a single string. Zend_Db_Select recognizes objects of type Zend_Db_Expr and converts them back to string, but does not apply any alterations, such as quoting or correlation names.