对比pg主从库一致性

 对比了列名、列的数量、列的类型，将不一致的输出

import psycopg2

# 连接到主库和从库
conn_master = psycopg2.connect(dbname="xxx", user="postgres", password="xxx", host="xxx.xxx.xxx.xxx", port="5432")
conn_slave= psycopg2.connect(dbname="xxx", user="postgres", password="xxx", host="xxx.xxx.xxx.xxx", port="5432")


# 获取主库和从库的表列表
with conn_master.cursor() as cursor_master:
    cursor_master.execute("SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'")
    tables_master = [row[0] for row in cursor_master.fetchall()]

with conn_slave.cursor() as cursor_slave:
    cursor_slave.execute("SELECT table_name FROM information_schema.tables WHERE table_schema = 'public'")
    tables_slave = [row[0] for row in cursor_slave.fetchall()]

# 比较表名
for table_name in tables_master:
    if table_name in tables_slave:
        # 获取主库和从库的表结构
        with conn_master.cursor() as cursor_master:
            cursor_master.execute("""
                SELECT c.column_name, c.data_type, c.character_maximum_length, c.numeric_precision
                FROM information_schema.columns c
                JOIN information_schema.tables t ON c.table_name = t.table_name AND c.table_schema = t.table_schema
                WHERE t.table_name = %s AND t.table_schema = 'public'
                ORDER BY c.ordinal_position
            """, (table_name,))
            columns_master = cursor_master.fetchall()

        with conn_slave.cursor() as cursor_slave:
            cursor_slave.execute("""
                SELECT c.column_name, c.data_type, c.character_maximum_length, c.numeric_precision
                FROM information_schema.columns c
                JOIN information_schema.tables t ON c.table_name = t.table_name AND c.table_schema = t.table_schema
                WHERE t.table_name = %s AND t.table_schema = 'public'
                ORDER BY c.ordinal_position
            """, (table_name,))
            columns_slave = cursor_slave.fetchall()

        # 比较列数和列属性
        if len(columns_master) != len(columns_slave):
            print(f"{table_name} 表在主从库中的列数量不一致")
        else:
            for col_master, col_slave in zip(columns_master, columns_slave):
                if col_master != col_slave:
                    print(f"{table_name} 表的 {col_master[0]} 列在主从库中的属性不一致：\n主库：{col_master}\n从库：{col_slave}")
    else:
        print(f"主库的{table_name}表在从库中不存在")

# 关闭连接
conn_master.close()
conn_slave.close()