Database Connections and Pooling

def connect(**config):
    """
    Create a MySQL connection.
    
    Parameters:
    - user (str): MySQL username
    - password (str): MySQL password
    - host (str): MySQL server hostname (default: 'localhost')
    - port (int): MySQL server port (default: 3306)
    - database (str): Database name to connect to
    - charset (str): Character set for the connection (default: 'utf8')
    - use_pure (bool): Use pure Python implementation (default: True)
    - ssl_disabled (bool): Disable SSL/TLS (default: False)
    - autocommit (bool): Enable autocommit mode (default: False)
    - time_zone (str): Session time zone
    - connect_timeout (int): Connection timeout in seconds
    - read_timeout (int): Read timeout in seconds
    - write_timeout (int): Write timeout in seconds
    - compress (bool): Enable connection compression
    - unix_socket (str): Unix socket file path
    - auth_plugin (str): Authentication plugin name
    - collation (str): Connection collation
    - sql_mode (str): SQL mode for the session
    - init_command (str): Command to execute on connection
    - use_unicode (bool): Return Unicode strings (default: True)
    
    Returns:
    MySQLConnection or CMySQLConnection: Database connection object
    
    Raises:
    Error: Connection failed or invalid parameters
    """

import mysql.connector

# Basic connection
connection = mysql.connector.connect(
    user='myuser',
    password='mypassword',
    host='localhost',
    database='mydatabase'
)

# Connection with SSL
connection = mysql.connector.connect(
    user='myuser',
    password='mypassword',
    host='myserver.com',
    database='mydatabase',
    ssl_cert='/path/to/client-cert.pem',
    ssl_key='/path/to/client-key.pem',
    ssl_ca='/path/to/ca-cert.pem'
)

class MySQLConnection:
    """
    Pure Python MySQL connection implementation.
    
    Provides complete MySQL protocol implementation without external dependencies.
    Supports all MySQL features including prepared statements, multiple result sets,
    and comprehensive error handling.
    """
    
    def __init__(self, **config):
        """Initialize connection with configuration parameters"""
    
    def connect(self, **config):
        """Establish connection to MySQL server"""
    
    def close(self):
        """Close the connection to MySQL server"""
    
    def commit(self):
        """Commit current transaction"""
    
    def rollback(self):
        """Rollback current transaction"""
    
    def cursor(self, buffered=None, raw=None, prepared=None, 
              cursor_class=None, dictionary=None, named_tuple=None):
        """
        Create a cursor for executing SQL statements.
        
        Parameters:
        - buffered (bool): Buffer all results immediately
        - raw (bool): Return raw data without conversion
        - prepared (bool): Use prepared statements
        - cursor_class: Custom cursor class
        - dictionary (bool): Return rows as dictionaries
        - named_tuple (bool): Return rows as named tuples
        
        Returns:
        MySQLCursor: Cursor object for SQL operations
        """
    
    def start_transaction(self, consistent_snapshot=False, isolation_level=None, readonly=None):
        """
        Start a transaction.
        
        Parameters:
        - consistent_snapshot (bool): Use consistent snapshot
        - isolation_level (str): Transaction isolation level
        - readonly (bool): Read-only transaction
        """
    
    def in_transaction(self):
        """Check if connection is in a transaction"""
    
    def autocommit(self, value):
        """Set autocommit mode"""
    
    def get_server_info(self):
        """Get MySQL server version information"""
    
    def get_server_version(self):
        """Get MySQL server version as tuple"""
    
    def ping(self, reconnect=True, attempts=1, delay=0):
        """
        Ping the MySQL server.
        
        Parameters:
        - reconnect (bool): Attempt to reconnect if connection lost
        - attempts (int): Number of ping attempts
        - delay (int): Delay between attempts
        """
    
    def reset_session(self, user_variables=None, session_variables=None):
        """Reset session state"""
    
    def set_charset_collation(self, charset=None, collation=None):
        """Set character set and collation"""

class CMySQLConnection(MySQLConnection):
    """
    C extension-based MySQL connection (optional).
    
    Provides better performance through C implementation while maintaining
    the same interface as MySQLConnection. Available only when C extension
    is compiled and installed.
    """

class MySQLConnectionPool:
    """
    Connection pool for managing multiple MySQL connections.
    
    Provides automatic connection lifecycle management, connection reuse,
    and configurable pool sizing for optimal resource utilization.
    """
    
    def __init__(self, pool_size=5, pool_name=None, pool_reset_session=True, **config):
        """
        Initialize connection pool.
        
        Parameters:
        - pool_size (int): Maximum number of connections in pool (default: 5)
        - pool_name (str): Unique name for the pool
        - pool_reset_session (bool): Reset session variables on connection return
        - **config: Connection configuration parameters
        """
    
    def get_connection(self):
        """
        Get a connection from the pool.
        
        Returns:
        PooledMySQLConnection: Pooled connection wrapper
        
        Raises:
        PoolError: No connections available
        """
    
    def add_connection(self, cnx=None):
        """Add a connection to the pool"""
    
    def set_config(**config):
        """Update pool configuration"""

class PooledMySQLConnection:
    """
    Wrapper for pooled MySQL connections.
    
    Provides the same interface as MySQLConnection while managing
    automatic return to pool when connection is closed.
    """
    
    def close(self):
        """Return connection to pool instead of closing"""
    
    def config(self, **kwargs):
        """Configure the pooled connection"""

def generate_pool_name(**config):
    """
    Generate a unique pool name based on connection configuration.
    
    Parameters:
    - **config: Connection configuration parameters
    
    Returns:
    str: Generated pool name
    """

import mysql.connector

# Create connection pool
config = {
    'user': 'myuser',
    'password': 'mypassword',
    'host': 'localhost',
    'database': 'mydatabase',
    'pool_name': 'mypool',
    'pool_size': 10
}

# Get pooled connection
connection = mysql.connector.connect(**config)
cursor = connection.cursor()

# Use connection normally
cursor.execute("SELECT * FROM users")
results = cursor.fetchall()

# Connection automatically returns to pool when closed
cursor.close()
connection.close()

def connect(failover=None, **config):
    """
    Create connection with failover support.
    
    Parameters:
    - failover (list): List of failover server configurations
    - **config: Primary connection configuration
    
    Returns:
    MySQLConnection: Connection to available server
    
    Raises:
    InterfaceError: No servers available
    """

import mysql.connector

# Connection with failover servers
failover_config = {
    'user': 'myuser',
    'password': 'mypassword',
    'database': 'mydatabase',
    'failover': [
        {'host': 'primary.mysql.com', 'port': 3306},
        {'host': 'secondary.mysql.com', 'port': 3306},
        {'host': 'tertiary.mysql.com', 'port': 3306}
    ]
}

connection = mysql.connector.connect(**failover_config)

def read_option_files(**config):
    """
    Read MySQL option files and merge with provided configuration.
    
    Parameters:
    - option_files (list): List of option file paths to read
    - option_groups (list): Option groups to read from files
    - **config: Additional configuration parameters
    
    Returns:
    dict: Merged configuration from files and parameters
    """

import mysql.connector

# Connect using option files
connection = mysql.connector.connect(
    option_files=['/etc/mysql/my.cnf', '~/.my.cnf'],
    option_groups=['client', 'mysql']
)

ConnectionPoolConfig = {
    'pool_name': str,
    'pool_size': int,
    'pool_reset_session': bool
}

FailoverConfig = {
    'failover': list[dict[str, any]]
}

SSLConfig = {
    'ssl_disabled': bool,
    'ssl_cert': str,
    'ssl_key': str,
    'ssl_ca': str,
    'ssl_capath': str,
    'ssl_cipher': str,
    'ssl_verify_cert': bool,
    'ssl_verify_identity': bool
}