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import psycopg2
from psycopg2 import Error
class PostgresHandler:
def __init__(self, username: str, password: str, host_name: str, port: int, database: str):
db_params = {
"dbname": database,
"user": username,
"password": password,
"host": host_name,
"port": port
}
self._connection = psycopg2.connect(**db_params)
print("Handler Success")
def get_connection(self):
return self._connection
def create_table(self, name: str, column: str):
cursor = self._connection.cursor()
cursor.execute(f'CREATE TABLE IF NOT EXISTS "{name}" ({column})')
self._connection.commit()
cursor.close()
def clear_table(self, name: str):
cursor = self._connection.cursor()
cursor.execute(f"DELETE FROM {name}")
self._connection.commit()
cursor.close()
def check_row_exists(self, table_name: str, column_name: str, value: str):
cursor = self._connection.cursor()
query = f'SELECT 1 FROM "{table_name}" WHERE {column_name} = %s'
cursor.execute(query, (value,))
result = cursor.fetchone()
cursor.close()
if result is not None:
return True
else:
return False
def insert_row(self, table_name, column, data):
try:
cursor = self._connection.cursor()
placeholders = ', '.join(['%s'] * len(data))
query = f'INSERT INTO "{table_name}" ({column}) VALUES ({placeholders})'
cursor.execute(query, data)
self._connection.commit()
print("Data Inserted:", data)
except Error as err:
self._connection.rollback()
print("Error inserting data")
print(err)
if "duplicate key" not in str(err).lower():
return False
return True
def update_row(self, table_name: str, column: str, value: str, update_column: str, update_value: str):
try:
cursor = self._connection.cursor()
query = f'UPDATE "{table_name}" SET {update_column} = %s WHERE {column} = %s'
cursor.execute(query, (update_value, value))
self._connection.commit()
print("Data Updated:", value, update_value)
except Error as e:
self._connection.rollback()
print(f"Failed to update row from {table_name} WHERE {column} is {value}")
print(e)
return False
return True
def get_rows(self, table_name: str, column: str, value: str):
try:
cursor = self._connection.cursor()
query = f'SELECT * FROM "{table_name}" WHERE {column} = %s'
cursor.execute(query, (value,))
result = cursor.fetchall()
return result
except Error as e:
self._connection.rollback()
print(f"Failed to fetch row from {table_name} WHERE {column} is {value}")
print(e)
return False
def get_random_row(self, table_name: str, count: int, condition: str = None):
if condition is None:
condition = "1 = 1"
try:
cursor = self._connection.cursor()
query = f"SELECT * FROM {table_name} WHERE {condition} ORDER BY RANDOM() LIMIT {str(count)}"
cursor.execute(query)
result = cursor.fetchall()
return result
except Error as e:
self._connection.rollback()
print(f"Failed to select random rows from {table_name}")
print(e)
return False
def check_health(self):
cursor = self._connection.cursor()
cursor.execute("SELECT 1")
result = cursor.fetchone()
cursor.close()
if result is not None:
return True
else:
return False
def delete_row(self, table_name: str, column: str, value: str):
try:
cursor = self._connection.cursor()
query = f"DELETE FROM {table_name} WHERE {column} = %s"
cursor.execute(query, (value,))
self._connection.commit()
print("Data Deleted:", value)
except Error as e:
self._connection.rollback()
print(f"Failed to delete row from {table_name} WHERE {column} is {value}")
print(e)
return False
return True
def execute_query(self, query: str, data: tuple = None):
try:
cursor = self._connection.cursor()
if data is None:
cursor.execute(query)
else:
cursor.execute(query, data)
result = cursor.fetchall()
return result
except Error as e:
self._connection.rollback()
print(f"Failed to execute query: {query}")
print(e)
return False
def reset_auto_increment(self, table_name: str):
try:
cursor = self._connection.cursor()
query = f"ALTER SEQUENCE {table_name}_id RESTART WITH 1"
cursor.execute(query)
self._connection.commit()
print("Auto Increment Reset")
except Error as e:
self._connection.rollback()
print(f"Failed to reset auto increment for {table_name}")
print(e)
return False
return True
def get_most_recently_added_row_time(self, table_name: str):
try:
cursor = self._connection.cursor()
query = f"SELECT timestamp FROM {table_name} ORDER BY id DESC LIMIT 1"
cursor.execute(query)
result = cursor.fetchone()
return result
except Error as e:
self._connection.rollback()
print(f"Failed to get most recently added row from {table_name}")
print(e)
return False
def close_connection(self):
self._connection.close()
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