Question

我正在尝试获取Redshift数据库中的所有表。

import os
import psycopg2
import sys
import rds_config

def lambda_handler(event, context):

  #for key in os.environ.keys():
  #    print(key)
  #return 0
  REDSHIFT_DATABASE = rds_config.db_name
  REDSHIFT_USER = rds_config.db_username
  REDSHIFT_PASSWD = rds_config.db_password
  REDSHIFT_PORT = rds_config.db_port
  REDSHIFT_ENDPOINT = rds_config.db_endpoint

  QUERY = "SELECT DISTINCT tablename FROM pg_table_def WHERE schemaname = 'public' ORDER BY tablename;"


  try:
    conn = psycopg2.connect(
      database = REDSHIFT_DATABASE,
      user=REDSHIFT_USER,
      password=REDSHIFT_PASSWD,
      port=REDSHIFT_PORT,
      host=REDSHIFT_ENDPOINT)
  except Exception as ERROR:
    print(ERROR)
    sys.exit(1)

  try:
    cursor = conn.cursor()
    print(QUERY)
    print(cursor.execute(QUERY))

    cursor.close()
    conn.commit()
    conn.close()
  except Exception as ERROR:
    print( ERROR)
    sys.exit(1)

上面的查询正在RedshiftQuery Editor中运行，但是当我尝试使用lambda执行它时失败。

我只是想阅读Redshift中的所有表格。

我没有收到任何错误消息

print(cursor.execute(QUERY))打印None

Answer 1

我想您在查询执行后遗漏了最重要的几行-

rows = cursor.fetchall()

类似这样的

try: # retrieving all tables in my search_path cursor.execute("""select tablename from pg_table_def""") except Exception as err: print err.code,err rows = cursor.fetchall() for row in rows print row

查看演示摘要： https://gist.github.com/jaychoo/4e3effdeed3672173b67

获取Redshift中的所有表名

1 个答案: