# 1、HTTPS

import json
import boto3

def lambda_handler(event, context):
    print (event)
    dynamodb = boto3.resource('dynamodb')
    table = dynamodb.Table('message')

    body=json.loads(event['body'])
    mykey = body['MessageAttributes']['mykey']['Value']
    seq = body['MessageAttributes']['order']['Value']
    https = body['Message']
    
    response = table.get_item(
        Key={
            'mykey': mykey
        }
    )
    
    item = {'mykey': {'S': mykey},
            'seq': {'S': seq}, 
            'https': {'S': https}
    }
    
    if response:
        table.update_item(
            Key={
                'mykey': mykey
            },
        UpdateExpression='SET https = :https',
        ExpressionAttributeValues={
            ':https': https
            }
        )
        table.update_item(
            Key={
                'mykey': mykey
            },
        UpdateExpression='SET seq = :seq',
        ExpressionAttributeValues={
            ':seq': seq
            }
        )
    else:
        table.put_item(Item = item)

    
# 2、lambda

import json
import boto3

def lambda_handler(event, context):
    dynamodb = boto3.resource('dynamodb')
    table = dynamodb.Table('message')

    body=event['Records'][0]['Sns']
    mykey = body['MessageAttributes']['mykey']['Value']
    seq = body['MessageAttributes']['order']['Value']
    lamb = body['Message']
    
    response = table.get_item(
        Key={
            'mykey': mykey
        }
    )
    
    item = {  'mykey': {'S': mykey},
            'seq': {'S': seq}, 
            'lamb': {'S': lamb}
    }
    
    if response:
        table.update_item(
            Key={
                'mykey': mykey
            },
        UpdateExpression='SET lamb = :lamb',
        ExpressionAttributeValues={
            ':lamb': lamb
            }
        )
    else:
        table.put_item(Item = item)

    
# 3、 SQS 

import json
import boto3

def lambda_handler(event, context):
    dynamodb = boto3.resource('dynamodb')
    table = dynamodb.Table('message')
    print (event)

    body=json.loads(event['Records'][0]['body'])
    mykey = body['MessageAttributes']['mykey']['Value']
    seq = body['MessageAttributes']['order']['Value']
    sqs = body['Message']
    
    response = table.get_item(
        Key={
            'mykey': mykey
        }
    )
    
    item = {  'mykey': {'S': mykey},
            'seq': {'S': seq}, 
            'sqs': {'S': sqs}
    }
    
    if response:
        table.update_item(
            Key={
                'mykey': mykey
            },
        UpdateExpression='SET sqs = :sqs',
        ExpressionAttributeValues={
            ':sqs': sqs
            }
        )
    else:
        table.put_item(Item = item)

    
    

# 4、 pymysql

import json
import boto3
import pymysql


def lambda_handler(event, context):
    dynamodb = boto3.resource('dynamodb')
    table = dynamodb.Table('message')
    print(event)
    
    mykey = event['Records'][0]['dynamodb']['Keys']['mykey']['S']
    #order = event['Records'][0]['dynamodb']['NewImage']['order']['S']
    #sqs = event['Records'][0]['dynamodb']['NewImage']['sqs']['S']
    #https = event['Records'][0]['dynamodb']['NewImage']['https']['S']
    #lamb = event['Records'][0]['dynamodb']['NewImage']['lambda']['S']

    response = table.get_item(
        Key={
            'mykey': mykey
        }
    )
    
    if 'Item' in response:
        item = response['Item']
        
        if 'sqs' in item and 'lamb' in item and 'https' in item and 'seq' in item:
            seq = item['seq']
            sqs = item['sqs']
            lamb = item['lamb']
            https = item['https']
            
        else:
            return
    else:
        return
    
    message = ''
    
    seqs = seq.split()
    print(seqs)
    for iterator in seqs:
        result = iterator.split(':')
        #print('result:'+result)
        if result[1] == '0':
            if result[0] == 'SQS':
                message = sqs
            elif result[0] == 'HTTPS':
                message = https
            elif result[0] == 'LAMBDA':
                message = lamb
    
    for iterator in seqs:
        result = iterator.split(':')
        if result[1] == '1':
            if result[0] == 'SQS':
                message += sqs
            elif result[0] == 'HTTPS':
                message += https
            elif result[0] == 'LAMBDA':
                message += lamb
    
            
    for iterator in seqs:
        result = iterator.split(':')
        if result[1] == '2':
            if result[0] == 'SQS':
                message += sqs
            elif result[0] == 'HTTPS':
                message += https
            elif result[0] == 'LAMBDA':
                message += lamb
                    
    print (message)
                    
    
    db = pymysql.connect("mydbinst.cf6cb5zflfqe.rds.cn-northwest-1.amazonaws.com.cn","admin","12345678","mydb" )

    cursor = db.cursor()

    sql = "insert into kv(mykey, myvalue) values( %s,  %s)"
    val = (mykey, message)

    #try:
    cursor.execute(sql, val)
    db.commit()
    #except:
    #    db.rollback()
 
    db.close()