MSSQL functions for PHP functions

PHP is an open source server-side scripting language commonly used to develop web applications. PHP has the advantages of being easy to learn, easy to use, flexible, and has excellent performance, so it has been widely used in the field of web development. As a popular relational database management system, MSSQL is also supported by PHP.

To implement MSSQL database operations in PHP, you need to use MSSQL functions. MSSQL functions can be used to connect to the database, execute query statements, read and write data in the database, and other operations. Next, some commonly used MSSQL functions will be introduced in detail.

1. mssql_connect function

This function is used to connect to the MSSQL database. Its syntax is as follows:

mssql_connect(servername, username, password);

where servername is the name or IP address of the database server; username is the username to connect to the database; password is the name to connect to the database password.

When the connection is successful, this function will return a connection identifier for subsequent database operations. If the connection fails, false is returned.

2. mssql_select_db function

This function is used to select a database, its syntax is:

mssql_select_db(databasename, connection);

Among them, databasename is the name of the database to be selected; connection is the connection identifier, which is the connection identifier returned by the mssql_connect function. Returns true if the selection is successful; otherwise returns false.

3. mssql_query function

This function is used to execute query statements. SELECT, INSERT, UPDATE, DELETE and other statements can be used in MSSQL. The syntax is as follows:

mssql_query(query, connection);

where query is the query statement to be executed; connection is the connection identifier. This function returns a result set identifier that can be used to read the query results.

4. mssql_fetch_array function

This function is used to read the query results and return the result set in the form of an array. The syntax is as follows:

mssql_fetch_array(result, result_type);

Among them, result is the result set identifier to be read; result_type is an optional parameter used to specify the type of the returned array. If this parameter is omitted, two types of arrays are returned by default: numeric index and associative index.

5. mssql_num_rows function

This function is used to count the number of rows in the query result set. The syntax is as follows:

mssql_num_rows(result);

Among them, result is the query result set identifier. The function return value is the number of rows in the result set.

6. mssql_fetch_row function

This function is used to return the next row of data in the query result set, expressed in the form of a numeric index. The syntax is as follows:

mssql_fetch_row(result);

Among them, result is the query result set identifier. The function return value is an array whose subscript is a numeric type.

7. mssql_fetch_assoc function

This function is used to return the next row of data in the query result set, expressed in the form of an associated index. The syntax is as follows:

mssql_fetch_assoc(result);

where result is the query result set identifier. The function return value is an array whose subscript is the associated index type.

8. mssql_free_result function

This function is used to release the memory space occupied by the result set. The syntax is as follows:

mssql_free_result(result);

where result is the result set identifier to be released.

9. mssql_close function

This function is used to close the database connection. The syntax is as follows:

mssql_close(connection);

where connection is the connection identifier to be closed, that is, the connection identifier returned by the mssql_connect function.

Summary

MSSQL function is an important tool for operating MSSQL database in PHP. When developing web applications, mastering the use of MSSQL functions can help us complete database operations quickly and efficiently. The common MSSQL functions described above are suitable for most situations, but there are many other functions that can be used for specific needs and scenarios. Therefore, in actual development, it is necessary to select appropriate functions according to specific situations to achieve the best development results.

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