PostgreSQL functions for PHP functions

PHP is a scripting language widely used in the field of web development, while PostgreSQL is a relational database management system. The combination of the two can achieve many powerful functions. This article will introduce the application and functions of PHP functions in PostgreSQL.

1. Connect to PostgreSQL

When connecting to PostgreSQL in PHP, you can create a connection through the pg_connect() function. This function needs to specify the host, port, database name, user name, password and other information of the database. After the connection is successful, you can use the pg_query() function to execute SQL query statements.

2. Query data

When querying data, you can use the pg_query() function to execute SQL query statements and return a result set. The data in the result set can be obtained row by row, using the pg_fetch_row() function to obtain single row data, and the pg_fetch_assoc() function to obtain data in associative array format.

3. Insert data

When inserting data, you can use the pg_query() function to execute the INSERT statement. The form of the INSERT statement is: INSERT INTO table_name (column1, column2, …) VALUES (value1, value2, …).

4. Update data

When updating data, you can use the pg_query() function to execute the UPDATE statement. The form of the UPDATE statement is: UPDATE table_name SET column1 = value1, column2 = value2, … WHERE condition.

5. Delete data

When deleting data, you can use the pg_query() function to execute the DELETE statement. The form of the DELETE statement is: DELETE FROM table_name WHERE condition.

6. Transaction processing

In PostgreSQL, transactions can be used to perform batch operations on the database. Transaction processing can include multiple operations such as insertion, modification, and deletion. It is guaranteed that in the entire transaction, as long as one operation fails, the entire transaction will not be executed. In PHP, you can use the pg_query() function to execute transaction control statements such as BEGIN, COMMIT, and ROLLBACK.

7. Stored procedures and functions

PostgreSQL supports the writing and calling of stored procedures and functions. You can use the pg_query() function to execute the CREATE FUNCTION statement to create a stored procedure or function. The form of the CREATE FUNCTION statement is: CREATE FUNCTION function_name(argument_list) RETURNS return_type AS $$ function_body $$ LANGUAGE plpgsql;

When calling a stored procedure or function, you can use the pg_prepare() function and pg_execute() function. The pg_prepare function is used to prepare SQL statements, and the pg_execute() function is used to execute preprocessed statements.

8. Summary

Through the introduction of this article, we can see the powerful functions of PHP functions in PostgreSQL. PHP functions can connect, query, insert, update, delete data, perform transaction control, and write and call stored procedures and functions. The comprehensive use of these functions can provide efficient, stable and secure back-end database services for web applications.

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