ODBC function of php3_PHP tutorial
Now let's list the commonly used ODBC functions in PHP3:
odbc_connect (dns, user, pass);
Returns a connection number, or 0 if the connection fails.
odbc_pconnect (dns,user,pass);
Special connection, the connection will not be disconnected after the script is finished running. The second time connecting to the same DNS is faster.
odbc_commit (connection number);
Interrupt the thread executing the connection, return True if successful, and False if failed.
odbc_autocommit (connection number, 0/1);
When the parameter is 1, set all threads executing the connection to automatically interrupt.
odbc_do/odbc_exec (connection number, sql statement);
Execute the sql statement and return a result number. If the operation fails, false is returned.
odbc_prepare (connection number, sql statement);
Returns a result number, but does not execute the sql statement. You can use odbc_execute (the result number) to execute later.
odbc_fetch_into (result number, [number of records,] array);
Put a certain record of the result (omitted to the next record) into the array (starting from [0]), regardless of the number of the array type.
Returns the position of the record in the result, or returns false if the operation fails.
odbc_fetch_row (result number, [number of records]);
Move to a certain record (omitted to the next record), which can be read and written by odbc_result.
odbc_num_fields (result number);
Returns the total number of fields.
odbc_num_rows (result number);
Returns the total number of records.
odbc_result (result number, field number/field name);
Returns the field number/field name in the current record in the result.
odbc_result_all (result number, sql statement);
Return all query results and output them in html table.
odbc_field_name/odbc_field_type/odbc_field_len (result number, field number);
Returns the field name/data type/data length of the field.
odbc_lonreaglen (result number, length);
Set the field length of the returned result. If the length is 0, all will be returned.
odbc_free_result (result number);
Release memory when the query results in memory are not needed.
odbc_cursor (result number);
Returns a pointer pointing to the result.
odbc_rollback
odbc_close (connection number);
Close the connection.
odbc_close_all();
Close all connections.
A specific example of using PHP3 to manipulate ODBC database.
db is the dsn name of odbc, tab1 is the table name
echo "ODBC Samples"."
";
$Connection_ID=odbc_connect(" db","","");
$Result_ID=odbc_exec($Connection_ID,"Select * from tab1");
$i=1;
$fldCount=odbc_num_fields($Result_ID);
echo "";
while (odbc_fetch_row($Result_ID,$i)0)
{
echo " ";
for ($j=1;$j{
echo " ".$i." ";
echo " ".odbc_result($Result_ID,$j)." ";
}
echo "
";
$i=$i+1;
}
echo " ";
?>
In fact, the query process It can also be simplified to:
$Connection_ID=odbc_connect("db","","");
$Result_ID=odbc_exec($Connection_ID,"Select * from tab1");
$fldCount=odbc_num_fields ($Result_ID);
odbc_result_all($Result_ID);
?>

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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