Access an ApsaraDB RDS for SQL Server database - Access other services| Alibaba Cloud Documentation Center

In Function Compute, you can use a function to call the ApsaraDB RDS for SQL Server API to perform operations such as insert and query on an ApsaraDB RDS for SQL Server database. In normal cases, states cannot be shared among different execution environments in Function Compute. You can persist structured data in a database so that states can be shared. This topic describes how to use Funcraft to deploy a function to access an ApsaraDB RDS for SQL Server database.

Prerequisites

You have created a virtual private cloud (VPC) and a VSwitch.
The VSwitch must belong to a zone supported by Function Compute. For more information about the zones supported by Function Compute, see VPC access.
Create an ApsaraDB RDS for SQL Server instance
You have created a database instance in same VPC as Function Compute. You do not need to create the VSwitch in the same zone as Function Compute. VSwitches under the same VPC can communicate with each other even when they are in different zones.
Configure an IP address whitelist for an ApsaraDB RDS for SQL Server instance
If you need to control access to databases by using an IP address whitelist, ensure that you have entered the internal Classless Inter-Domain Routing (CIDR) blocks of the target VPCs in the IP field. To find the CIDR block of a VPC, log on to the VPC console and view the VPC Details page.
Create a security group
You have configured the security group to allow outbound traffic from the internal CIDR block and port of the database.

Write code for a function in Python 3

This section describes how to use Funcraft to write code for a function in Python 3 to access an ApsaraDB RDS for SQL Server database.

On the local machine, create a directory to store code and dependent modules. In the directory, create the template.yml file. In this example, the /tmp/code/template.yml file is created and contains the following content:
```
ROSTemplateFormatVersion: '2015-09-01'
Transform: 'Aliyun::Serverless-2018-04-03'
Resources:
  service:
    Type: 'Aliyun::Serverless::Service'
    Properties:
      Description: This is SQL-Server service
      Policies:
        - AliyunECSNetworkInterfaceManagementAccess
      VpcConfig:
        VpcId: vpc-xxx
        VSwitchIds:
          - vsw-xxx
        SecurityGroupId: sg-xxx
      InternetAccess: true
    function:
      Type: 'Aliyun::Serverless::Function'
      Properties:
        Handler: 'index.handler'
        Runtime: python3
        Timeout: 10
        MemorySize: 128
        CodeUri: '. /'                            
```
The following list describes the main parameters:
- A service named service is declared.
  - Policies: grants Function Compute permission to manage elastic network interfaces (ENIs) attached to Elastic Compute Service (ECS) instances. Function Compute can then access resources in the VPC.
  - VpcConfig: binds the VPC to the service. You must replace the following values with the information for your VPC.
    - VpcId: the ID of the VPC.
    - VSwitchId: the ID of the VSwitch.
    - SecurityGroupId: the ID of the security group.
- A function named function is declared.
  - Handler: the function handler. For more information, see Function entry point.
  - Runtime: the runtime environment of the function.
  - CodeUri: the directory where the code package is located.
    When you deploy the function, Funcraft packages and uploads the items in the directory that the CodeUri parameter specifies.
In the directory that contains the template.yml file, create the Funfile file. In this example, the new file contains the following sample content:
```
RUNTIME python3
RUN fun-install pip install pymssql                 
```
Run the fun install command to install dependencies.
```
fun install
```
When the code editor shows the following content, the dependencies have been installed.
```
Install Success
```

In the directory that contains the template.yml file, create a Python file. In this example, the /tmp/code/index.py file is created and contains the following sample content:

# -*- coding: utf-8 -*-
import pymssql
def handler(event, context):

    conn = pymssql.connect(host='rm-xxx.sqlserver.rds.aliyuncs.com',
                                user='xxx',
                                password='x'x'x'x',
                                database='xxx',
                                charset='utf8')
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM inventory WHERE quantity > 152')

    result = ''

    for row in cursor:
        result += 'row = %r\n' % (row,)
    conn.close()
    return result

Run the following command to deploy the function to Function Compute by using Funcraft:
```
fun deploy
```
When the code editor shows the following content, the function has been deployed.
```
        function <function-name> deploy success
service <service-name> deploy success
```
After the deployment is complete, log on to the and click Service/Function. On the page that appears, you can see the newly deployed service and function.

Write code for a function in PHP 7.2

This section describes how to use Funcraft to write code for a function in PHP 7.2 to access an ApsaraDB RDS for SQL Server database.

On the local machine, create a directory to store code and dependent modules. In the directory, create the template.yml file. In this example, the /tmp/code/template.yml file is created and contains the following content:
```
ROSTemplateFormatVersion: '2015-09-01'
Transform: 'Aliyun::Serverless-2018-04-03'
Resources:
   service:
        Type: 'Aliyun::Serverless::Service'
        Properties:
          Description: This is SQL-Server service
          Policies:
            - AliyunECSNetworkInterfaceManagementAccess
          VpcConfig:
            VpcId: vpc-xxx
            VSwitchIds:
              - vsw-x'x'x'x
            SecurityGroupId: sg-xxx
          InternetAccess: true
        function:
          Type: 'Aliyun::Serverless::Function'
          Properties:
            Handler: 'index.handler'
            Runtime: php7.2
            Timeout: 10
            MemorySize: 128
            CodeUri: '. /'
            EnvironmentVariables:
              ODBCINI: /code/.fun/root/etc/odbc.ini
              ODBCSYSINI: /code/.fun/root/opt/microsoft/msodbcsql17/etc                        
```
The following list describes the main parameters:
- A service named service is declared.
  - Policies: grants Function Compute permission to manage elastic network interfaces (ENIs) attached to Elastic Compute Service (ECS) instances. Function Compute can then access resources in the VPC.
  - VpcConfig: binds the VPC to the service. You must replace the following values with the information for your VPC.
    - VpcId: the ID of the VPC.
    - VSwitchId: the ID of the VSwitch.
    - SecurityGroupId: the ID of the security group.
- A function named function is declared.
  - Handler: the function handler. For more information, see Function entry point.
  - Runtime: the runtime environment of the function.
  - CodeUri: the directory where the code package is located.
    When you deploy the function, Funcraft packages and uploads the items in the directory that the CodeUri parameter specifies.
  - EnvironmentVariables: the environment variables of the function.
    - ODBCINI: the directory where the odbc.ini file to be uploaded is located.
    - ODBCSYSINI: the directory where the odbcinst.ini file to be uploaded is located.

In the directory that contains the template.yml file, create the Funfile file. In this example, the new file contains the following sample content:

RUNTIME php7.2
RUN apt-get update && apt-get install -y apt-transport-https apt-utils
RUN curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add -
RUN curl https://packages.microsoft.com/config/debian/8/prod.list > /etc/apt/sources.list.d/mssql-release.list
RUN fun-install apt-get install unixodbc-dev
RUN fun-install apt-get install msodbcsql17

Run the fun install command to install dependencies.
```
$fun install         
```
When the code editor shows the following content, the dependencies have been installed.
```
Install Success
```
Modify the odbc.ini file in the root directory, such as /tmp/code/odbc.ini. Modify the value of the Driver parameter in the file to /code/.fun/root/opt/microsoft/msodbcsql17/lib64/libmsodbcsql-17.5.so.1.1.

Note If you need to use pdo_sqlsrv to extend the code in the PHP environment, see Non-built-in extension for php runtime compilation.

Create a file in a directory at the same level as that of the template.yml file, such as /tmp/code/index.php. The following sample code is provided:

<? php
function handler($event, $context)
{
   try {
       $conn = new PDO("sqlsrv:Server=rm-xxx.sqlserver.rds.aliyuncs.com;Database=xxx","xxx","xxx");
       // set the PDO error mode to exception
       $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
       $conn->query("set names utf-8");
       $sql="SELECT * FROM inventory WHERE quantity > 152";
       $result = $conn->prepare($sql);
       $result->execute();
       print($result);
       return ("Connection successed.");
   } catch (PDOException $e) {
       return ("Connection failed: " . $e->getMessage());
   }
}

Run the following command to deploy the function to Function Compute by using Funcraft:
```
fun deploy                          
```
When the code editor shows the following content, the function has been deployed.
```
        function <function-name> deploy success
service <service-name> deploy success
```
After the deployment is complete, log on to the and click Service/Function. On the page that appears, you can see the newly deployed service and function.

Debug the function

After the function is deployed, you can debug it in the Function Compute console.

Log on to the Function Compute console.
In the top navigation bar, select a region.
In the left-side navigation pane, click Services and Functions.
In the Services pane, click the service that you require. On the Functions tab, click the name of the function that you require.
On the page that appears, click the Code tab. On the Code tab, click Invoke.
After the execution is complete, you can view the execution results and logs.