Azure Database for MySQL input binding for Azure Functions

When a function runs, the Azure Database for MySQL input binding retrieves data from a database and passes it to the input parameter of the function.

For information on setup and configuration, see the overview.

Important

This article uses tabs to support multiple versions of the Node.js programming model. The v4 model is generally available and is designed to have a more flexible and intuitive experience for JavaScript and TypeScript developers. For more details about how the v4 model works, refer to the Azure Functions Node.js developer guide. To learn more about the differences between v3 and v4, refer to the migration guide.

Examples

You can create a C# function by using one of the following C# modes:

• Isolated worker model: Compiled C# function that runs in a worker process that's isolated from the runtime. An isolated worker process is required to support C# functions running on long-term support (LTS) and non-LTS versions for .NET and the .NET Framework.
• In-process model: Compiled C# function that runs in the same process as the Azure Functions runtime.
• C# script: Used primarily when you create C# functions in the Azure portal.

Isolated worker model

More samples for the Azure Database for MySQL input binding are available in the GitHub repository.

This section contains the following examples:

• HTTP trigger, get a row by ID from a query string
• HTTP trigger, get multiple rows from route data
• HTTP trigger, delete rows

The examples refer to a Product class and a corresponding database table:

namespace AzureMySqlSamples.Common
{
    public class Product
    {
        public int? ProductId { get; set; }

        public string Name { get; set; }

        public int Cost { get; set; }

        public override bool Equals(object obj)
    }
}

DROP TABLE IF EXISTS Products;

CREATE TABLE Products (
  ProductId int PRIMARY KEY,
  Name varchar(100) NULL,
  Cost int NULL
);

HTTP trigger, get a row by ID from a query string

The following example shows a C# function that retrieves a single record. The function is triggered by an HTTP request that uses a query string to specify the ID. That ID is used to retrieve a Product record with the specified query.

Note

The HTTP query string parameter is case-sensitive.

using System.Collections.Generic;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Extensions.MySql;
using Microsoft.Azure.Functions.Worker.Http;
using AzureMySqlSamples.Common;

namespace AzureMySqlSamples.InputBindingIsolatedSamples
{
    public static class GetProductById
    {
        [Function(nameof(GetProductById))]
        public static IEnumerable<Product> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "getproducts/{productId}")]
            HttpRequestData req,
            [MySqlInput("select * from Products where ProductId = @productId",
                "MySqlConnectionString",
                parameters: "@ProductId={productId}")]
            IEnumerable<Product> products)
        {
            return products;
        }
    }
}

HTTP trigger, get multiple rows from a route parameter

The following example shows a C# function that retrieves rows that the query returned. The function is triggered by an HTTP request that uses route data to specify the value of a query parameter. That parameter is used to filter the Product records in the specified query.

using System.Collections.Generic;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Extensions.MySql;
using Microsoft.Azure.Functions.Worker.Http;
using AzureMySqlSamples.Common;

namespace AzureMySqlSamples.InputBindingIsolatedSamples
{
    public static class GetProducts
    {
        [Function(nameof(GetProducts))]
        public static IEnumerable<Product> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "getproducts")]
            HttpRequestData req,
            [MySqlInput("select * from Products",
                "MySqlConnectionString")]
            IEnumerable<Product> products)
        {
            return products;
        }
    }
}

HTTP trigger, delete rows

The following example shows a C# function that executes a stored procedure with input from the HTTP request's query parameter.

The stored procedure DeleteProductsCost must be created on the MySQL database. In this example, the stored procedure deletes a single record or all records, depending on the value of the parameter.

DROP PROCEDURE IF EXISTS DeleteProductsCost;

Create Procedure DeleteProductsCost(cost INT)
BEGIN
  DELETE from Products where Products.cost = cost;
END

namespace AzureMySqlSamples.InputBindingSamples
{
    public static class GetProductsStoredProcedure
    {
        [FunctionName(nameof(GetProductsStoredProcedure))]
        public static IActionResult Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "getproducts-storedprocedure/{cost}")]
            HttpRequest req,
            [MySql("DeleteProductsCost",
                "MySqlConnectionString",
                commandType: System.Data.CommandType.StoredProcedure,
                parameters: "@Cost={cost}")]
            IEnumerable<Product> products)
        {
            return new OkObjectResult(products);
        }
    }
}

In-process model

More samples for the Azure Database for MySQL input binding are available in the GitHub repository.

This section contains the following examples:

• HTTP trigger, get a row by ID from a query string
• HTTP trigger, get multiple rows from route data
• HTTP trigger, delete rows

The examples refer to a Product class and a corresponding database table:

namespace AzureMySqlSamples.Common
{
    public class Product
    {
        public int? ProductId { get; set; }

        public string Name { get; set; }

        public int Cost { get; set; }

        public override bool Equals(object obj)
    }
}

DROP TABLE IF EXISTS Products;

CREATE TABLE Products (
  ProductId int PRIMARY KEY,
  Name varchar(100) NULL,
  Cost int NULL
);

HTTP trigger, get a row by ID from a query string

The following example shows a C# function that retrieves a single record. The function is triggered by an HTTP request that uses a query string to specify the ID. That ID is used to retrieve a Product record with the specified query.

Note

The HTTP query string parameter is case-sensitive.

using System.Collections.Generic;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Azure.WebJobs.Extensions.MySql;
using AzureMySqlSamples.Common;

namespace AzureMySqlSamples.InputBindingSamples
{
    public static class GetProductById
    {
        [FunctionName("GetProductById")]
        public static IActionResult Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", Route = "getproducts/{productId}")] HttpRequest req,
            [MySql("select * from Products where ProductId = @productId",
                "MySqlConnectionString",
                parameters: "@ProductId={productId}")]
            IEnumerable<Product> products)
        {
            return new OkObjectResult(products);
        }
    }
}

HTTP trigger, get multiple rows from a route parameter

The following example shows a C# function that retrieves documents that the query returned. The function is triggered by an HTTP request that uses route data to specify the value of a query parameter. That parameter is used to filter the Product records in the specified query.

using System.Collections.Generic;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Azure.WebJobs.Extensions.MySql;
using AzureMySqlSamples.Common;

namespace AzureMySqlSamples.InputBindingSamples
{
    public static class GetProducts
    {
        [FunctionName("GetProducts")]
        public static IActionResult Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", Route = "getproducts")] HttpRequest req,
            [MySql("select * from Products",
                "MySqlConnectionString")]
            IEnumerable<Product> products)
        {
            return new OkObjectResult(products);
        }
    }
}

HTTP trigger, delete rows

The following example shows a C# function that executes a stored procedure with input from the HTTP request's query parameter.

The stored procedure DeleteProductsCost must be created on the MySQL database. In this example, the stored procedure deletes a single record or all records, depending on the value of the parameter.

DROP PROCEDURE IF EXISTS DeleteProductsCost;

Create Procedure DeleteProductsCost(cost INT)
BEGIN
  DELETE from Products where Products.cost = cost;
END

namespace AzureMySqlSamples.InputBindingSamples
{
    public static class GetProductsStoredProcedure
    {
        [FunctionName(nameof(GetProductsStoredProcedure))]
        public static IActionResult Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "getproducts-storedprocedure/{cost}")]
            HttpRequest req,
            [MySql("DeleteProductsCost",
                "MySqlConnectionString",
                commandType: System.Data.CommandType.StoredProcedure,
                parameters: "@Cost={cost}")]
            IEnumerable<Product> products)
        {
            return new OkObjectResult(products);
        }
    }
}

More samples for the Azure Database for MySQL input binding are available in the GitHub repository.

This section contains the following examples:

• HTTP trigger, get multiple rows
• HTTP trigger, get a row by ID from a query string
• HTTP trigger, delete rows

The examples refer to a Product class and a corresponding database table:

package com.function.Common;

import com.fasterxml.jackson.annotation.JsonProperty;

public class Product {
    @JsonProperty("ProductId")
    private int ProductId;
    @JsonProperty("Name")
    private String Name;
    @JsonProperty("Cost")
    private int Cost;

    public Product() {
    }

DROP TABLE IF EXISTS Products;

CREATE TABLE Products (
  ProductId int PRIMARY KEY,
  Name varchar(100) NULL,
  Cost int NULL
);

HTTP trigger, get multiple rows

The following example shows an Azure Database for MySQL input binding in a Java function that an HTTP request triggers. The binding reads from a query and returns the results in the HTTP response.

package com.function;

import com.function.Common.Product;
import com.microsoft.azure.functions.HttpMethod;
import com.microsoft.azure.functions.HttpRequestMessage;
import com.microsoft.azure.functions.HttpResponseMessage;
import com.microsoft.azure.functions.HttpStatus;
import com.microsoft.azure.functions.annotation.AuthorizationLevel;
import com.microsoft.azure.functions.annotation.FunctionName;
import com.microsoft.azure.functions.annotation.HttpTrigger;
import com.microsoft.azure.functions.mysql.annotation.CommandType;
import com.microsoft.azure.functions.mysql.annotation.MySqlInput;

import java.util.Optional;

public class GetProducts {
    @FunctionName("GetProducts")
    public HttpResponseMessage run(
            @HttpTrigger(
                name = "req",
                methods = {HttpMethod.GET},
                authLevel = AuthorizationLevel.ANONYMOUS,
                route = "getproducts}")
                HttpRequestMessage<Optional<String>> request,
            @MySqlInput(
                name = "products",
                commandText = "SELECT * FROM Products",
                commandType = CommandType.Text,
                connectionStringSetting = "MySqlConnectionString")
                Product[] products) {

        return request.createResponseBuilder(HttpStatus.OK).header("Content-Type", "application/json").body(products).build();
    }
}

HTTP trigger, get a row by ID from a query string

The following example shows an Azure Database for MySQL input binding in a Java function that an HTTP request triggers. The binding reads from a query filtered by a parameter from the query string and returns the row in the HTTP response.

public class GetProductById {
    @FunctionName("GetProductById")
    public HttpResponseMessage run(
            @HttpTrigger(
                name = "req",
                methods = {HttpMethod.GET},
                authLevel = AuthorizationLevel.ANONYMOUS,
                route = "getproducts/{productid}")
                HttpRequestMessage<Optional<String>> request,
            @MySqlInput(
                name = "products",
                commandText = "SELECT * FROM Products WHERE ProductId= @productId",
                commandType = CommandType.Text,
                parameters = "@productId={productid}",
                connectionStringSetting = "MySqlConnectionString")
                Product[] products) {

        return request.createResponseBuilder(HttpStatus.OK).header("Content-Type", "application/json").body(products).build();
    }
}

HTTP trigger, delete rows

The following example shows an Azure Database for MySQL input binding in a Java function that an HTTP request triggers. The binding executes a stored procedure with input from the HTTP request's query parameter.

The stored procedure DeleteProductsCost must be created on the database. In this example, the stored procedure deletes a single record or all records, depending on the value of the parameter.

DROP PROCEDURE IF EXISTS DeleteProductsCost;

Create Procedure DeleteProductsCost(cost INT)
BEGIN
  DELETE from Products where Products.cost = cost;
END

public class DeleteProductsStoredProcedure {
    @FunctionName("DeleteProductsStoredProcedure")
    public HttpResponseMessage run(
            @HttpTrigger(
                name = "req",
                methods = {HttpMethod.GET},
                authLevel = AuthorizationLevel.ANONYMOUS,
                route = "Deleteproducts-storedprocedure/{cost}")
                HttpRequestMessage<Optional<String>> request,
            @MySqlInput(
                name = "products",
                commandText = "DeleteProductsCost",
                commandType = CommandType.StoredProcedure,
                parameters = "@Cost={cost}",
                connectionStringSetting = "MySqlConnectionString")
                Product[] products) {

        return request.createResponseBuilder(HttpStatus.OK).header("Content-Type", "application/json").body(products).build();
    }
}

More samples for the Azure Database for MySQL input binding are available in the GitHub repository.

This section contains the following examples:

• HTTP trigger, get multiple rows
• HTTP trigger, get a row by ID from a query string
• HTTP trigger, delete rows

The examples refer to a database table:

DROP TABLE IF EXISTS Products;

CREATE TABLE Products (
  ProductId int PRIMARY KEY,
  Name varchar(100) NULL,
  Cost int NULL
);

HTTP trigger, get multiple rows

The following example shows an Azure Database for MySQL input binding that an HTTP request triggers. The binding reads from a query and returns the results in the HTTP response.

Model v4

import { app, HttpRequest, HttpResponseInit, input, InvocationContext } from '@azure/functions';

const mysqlInput = input.generic({
    commandText: 'select * from Products',
    commandType: 'Text',
    connectionStringSetting: 'MySqlConnectionString',
});

export async function httpTrigger1(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
    context.log('HTTP trigger and MySQL input binding function processed a request.');
    const products = context.extraInputs.get(mysqlInput);
    return {
        jsonBody: products,
    };
}

app.http('httpTrigger1', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    extraInputs: [mysqlInput],
    handler: httpTrigger1,
});

Model v3

TypeScript samples aren't documented for model v3.

Model v4

const { app, input } = require('@azure/functions');

const mysqlInput = input.generic({
    type: 'mysql',
    commandText: 'select * from Products where Cost = @Cost',
    parameters: '@Cost={Cost}',
    commandType: 'Text',
    connectionStringSetting: 'MySqlConnectionString'
})

app.http('GetProducts', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    route: 'getproducts/{cost}',
    extraInputs: [mysqlInput],
    handler: async (request, context) => {
        const products = JSON.stringify(context.extraInputs.get(mysqlInput));

        return {
            status: 200,
            body: products
        };
    }
});

Model v3

The following example is binding data in the function.json file:

{
  "bindings": [
    {
      "authLevel": "function",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in",
      "methods": [
        "get"
      ],
      "route": "getproducts"
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "products",
      "type": "mysql",
      "direction": "in",
      "commandText": "select * from Products",
      "commandType": "Text",
      "connectionStringSetting": "MySqlConnectionString"
    }
  ],
  "disabled": false
}

The Configuration section explains these properties.

The following example is sample JavaScript code:

module.exports = async function (context, req, products) {
    context.log('JavaScript HTTP trigger and MySQL input binding function processed a request.');

    context.res = {
        // status: 200, /* Defaults to 200 */
        mimetype: "application/json",
        body: products
    };
}

HTTP trigger, get a row by ID from a query string

The following example shows an Azure Database for MySQL input binding that an HTTP request triggers. The binding reads from a query filtered by a parameter from the query string and returns the row in the HTTP response.

Model v4

import { app, HttpRequest, HttpResponseInit, input, InvocationContext } from '@azure/functions';

const mysqlInput = input.generic({
    commandText: 'select * from Products where ProductId= @productId',
    commandType: 'Text',
    parameters: '@productId={productid}',
    connectionStringSetting: 'MySqlConnectionString',
});

export async function httpTrigger1(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
    context.log('HTTP trigger and MySQL input binding function processed a request.');
    const products = context.extraInputs.get(mysqlInput);
    return {
        jsonBody: products,
    };
}

app.http('httpTrigger1', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    extraInputs: [mysqlInput],
    handler: httpTrigger1,
});

Model v3

TypeScript samples aren't documented for model v3.

Model v4

const { app, input } = require('@azure/functions');

const mysqlInput = input.generic({
    type: 'mysql',
    commandText: 'select * from Products where ProductId= @productId',
    commandType: 'Text',
    parameters: '@productId={productid}',
    connectionStringSetting: 'MySqlConnectionString'
})

app.http('GetProducts', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    route: 'getproducts/{productid}',
    extraInputs: [mysqlInput],
    handler: async (request, context) => {
        const products = JSON.stringify(context.extraInputs.get(mysqlInput));

        return {
            status: 200,
            body: products
        };
    }
});

Model v3

The following example is binding data in the function.json file:

{
  "bindings": [
    {
      "authLevel": "function",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in",
      "methods": [
        "get"
      ],
      "route": "getproducts/{productid}"
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "products",
      "type": "mysql",
      "direction": "in",
      "commandText": "select * from Products where ProductId= @productId",
      "commandType": "Text",
      "parameters": "@productId={productid}",
      "connectionStringSetting": "MySqlConnectionString"
    }
  ],
  "disabled": false
}

The Configuration section explains these properties.

The following example is sample JavaScript code:

module.exports = async function (context, req, products) {
    context.log('JavaScript HTTP trigger function processed a request.');
    context.log(JSON.stringify(products));
    return {
        status: 200,
        body: products
    };
}

HTTP trigger, delete rows

The following example shows an Azure Database for MySQL input binding that an HTTP request triggers. The binding executes a stored procedure with input from the HTTP request's query parameter.

The stored procedure DeleteProductsCost must be created on the database. In this example, the stored procedure deletes a single record or all records, depending on the value of the parameter.

DROP PROCEDURE IF EXISTS DeleteProductsCost;

Create Procedure DeleteProductsCost(cost INT)
BEGIN
  DELETE from Products where Products.cost = cost;
END

Model v4

import { app, HttpRequest, HttpResponseInit, input, InvocationContext } from '@azure/functions';

const mysqlInput = input.generic({
    commandText: 'DeleteProductsCost',
    commandType: 'StoredProcedure',
    parameters: '@Cost={cost}',
    connectionStringSetting: 'MySqlConnectionString',
});

export async function httpTrigger1(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
    context.log('HTTP trigger and MySQL input binding function processed a request.');
    const products = context.extraInputs.get(mysqlInput);
    return {
        jsonBody: products,
    };
}

app.http('httpTrigger1', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    extraInputs: [mysqlInput],
    handler: httpTrigger1,
});

Model v3

TypeScript samples aren't documented for model v3.

Model v4

const { app, input } = require('@azure/functions');

const mysqlInput = input.generic({
    type: 'mysql',
    commandText: 'DeleteProductsCost',
    commandType: 'StoredProcedure',
    parameters: '@Cost={cost}',
    connectionStringSetting: 'MySqlConnectionString'
})

app.http('httpTrigger1', {
    methods: ['POST'],
    authLevel: 'anonymous',
    route: 'DeleteProductsByCost',
    extraInputs: [mysqlInput],
    handler: async (request, context) => {
        const products = JSON.stringify(context.extraInputs.get(mysqlInput));

        return {
            status: 200,
            body: products
        };
    }
});

Model v3

{
  "bindings": [
    {
      "authLevel": "function",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in",
      "methods": [
        "get"
      ],
      "route": "DeleteProductsByCost"
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "products",
      "type": "mysql",
      "direction": "in",
      "commandText": "DeleteProductsCost",
      "commandType": "StoredProcedure",
      "parameters": "@Cost={cost}",
      "connectionStringSetting": "MySqlConnectionString"
    }
  ],
  "disabled": false
}

The Configuration section explains these properties.

The following example is sample JavaScript code:

module.exports = async function (context, req, products) {
    context.log('JavaScript HTTP trigger function processed a request.');
    context.log(JSON.stringify(products));
    return {
        status: 200,
        body: products
    };
}

More samples for the Azure Database for MySQL input binding are available in the GitHub repository.

This section contains the following examples:

• HTTP trigger, get multiple rows
• HTTP trigger, get a row by ID from a query string
• HTTP trigger, delete rows

The examples refer to a database table:

DROP TABLE IF EXISTS Products;

CREATE TABLE Products (
  ProductId int PRIMARY KEY,
  Name varchar(100) NULL,
  Cost int NULL
);

HTTP trigger, get multiple rows

The following example shows an Azure Database for MySQL input binding in a function.json file and a PowerShell function that an HTTP request triggers. The binding reads from a query and returns the results in the HTTP response.

The following example is binding data in the function.json file:

{
  "bindings": [
    {
      "authLevel": "function",
      "name": "Request",
      "type": "httpTrigger",
      "direction": "in",
      "methods": [
        "get"
      ],
      "route": "getproducts/{cost}"
    },
    {
      "name": "response",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "products",
      "type": "mysql",
      "direction": "in",
      "commandText": "select * from Products",
      "commandType": "Text",
      "connectionStringSetting": "MySqlConnectionString"
    }
  ],
  "disabled": false
}

The Configuration section explains these properties.

The following example is sample PowerShell code for the function in the run.ps1 file:

using namespace System.Net

param($Request, $TriggerMetadata, $products)

Write-Host "PowerShell function with MySql Input Binding processed a request."

Push-OutputBinding -Name response -Value ([HttpResponseContext]@{
    StatusCode = [System.Net.HttpStatusCode]::OK
    Body = $products
})

HTTP trigger, get a row by ID from a query string

The following example shows an Azure Database for MySQL input binding in a PowerShell function that an HTTP request triggers. The binding reads from a query filtered by a parameter from the query string and returns the row in the HTTP response.

The following example is binding data in the function.json file:

{
  "bindings": [
    {
      "authLevel": "function",
      "name": "Request",
      "type": "httpTrigger",
      "direction": "in",
      "methods": [
        "get"
      ],
      "route": "getproducts/{productid}"
    },
    {
      "name": "response",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "products",
      "type": "mysql",
      "direction": "in",
      "commandText": "select * from Products where ProductId= @productId",
      "commandType": "Text",
      "parameters": "MySqlConnectionString",
      "connectionStringSetting": "MySqlConnectionString"
    }
  ],
  "disabled": false
}

The Configuration section explains these properties.

The following example is sample PowerShell code for the function in the run.ps1 file:

using namespace System.Net

param($Request, $TriggerMetadata, $products)

Write-Host "PowerShell function with MySql Input Binding processed a request."

Push-OutputBinding -Name response -Value ([HttpResponseContext]@{
    StatusCode = [System.Net.HttpStatusCode]::OK
    Body = $products
})

HTTP trigger, delete rows

The following example shows an Azure Database for MySQL input binding in a function.json file and a PowerShell function that an HTTP request triggers. The binding executes a stored procedure with input from the HTTP request's query parameter.

The stored procedure DeleteProductsCost must be created on the database. In this example, the stored procedure deletes a single record or all records, depending on the value of the parameter.

DROP PROCEDURE IF EXISTS DeleteProductsCost;

Create Procedure DeleteProductsCost(cost INT)
BEGIN
  DELETE from Products where Products.cost = 'cost';
END

{
  "bindings": [
    {
      "authLevel": "function",
      "name": "Request",
      "type": "httpTrigger",
      "direction": "in",
      "methods": [
        "get"
      ],
      "route": "deleteproducts-storedprocedure/{cost}"
    },
    {
      "name": "response",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "products",
      "type": "mysql",
      "direction": "in",
      "commandText": "DeleteProductsCost",
      "commandType": "StoredProcedure",
      "parameters": "@Cost={cost}",
      "connectionStringSetting": "MySqlConnectionString"
    }
  ],
  "disabled": false
}

The Configuration section explains these properties.

The following example is sample PowerShell code for the function in the run.ps1 file:

using namespace System.Net

param($Request, $TriggerMetadata, $products)

Write-Host "PowerShell function with MySql Input Binding processed a request."

Push-OutputBinding -Name response -Value ([HttpResponseContext]@{
    StatusCode = [System.Net.HttpStatusCode]::OK
    Body = $products
}

More samples for the Azure Database for MySQL input binding are available in the GitHub repository.

This section contains the following examples:

• HTTP trigger, get multiple rows
• HTTP trigger, get a row by ID from a query string
• HTTP trigger, delete rows

The examples refer to a database table:

DROP TABLE IF EXISTS Products;

CREATE TABLE Products (
  ProductId int PRIMARY KEY,
  Name varchar(100) NULL,
  Cost int NULL
);

Note

You must use Azure Functions version 1.22.0b4 for Python.

HTTP trigger, get multiple rows

The following example shows an Azure Database for MySQL input binding in a function.json file and a Python function that an HTTP request triggers. The binding reads from a query and returns the results in the HTTP response.

v2

The following example is sample Python code for the function_app.py file:

import azure.functions as func
import datetime
import json
import logging

app = func.FunctionApp()


@app.generic_trigger(arg_name="req", type="httpTrigger", route="getproducts/{cost}")
@app.generic_output_binding(arg_name="$return", type="http")
@app.generic_input_binding(arg_name="products", type="mysql",
                           commandText= "select * from Products",
                           command_type="Text",
                           connection_string_setting="MySqlConnectionString")
def mysql_test(req: func.HttpRequest, products: func.MySqlRowList) -> func.HttpResponse:
    rows = list(map(lambda r: json.loads(r.to_json()), products))

    return func.HttpResponse(
        json.dumps(rows),
        status_code=200,
        mimetype="application/json"
    )

v1

The following example is binding data in the function.json file:

{
    "bindings": [
      {
        "authLevel": "function",
        "name": "req",
        "type": "httpTrigger",
        "direction": "in",
        "methods": [
          "get"
        ],
        "route": "getproducts/{cost}"
      },
      {
        "name": "$return",
        "type": "http",
        "direction": "out"
      },
      {
        "name": "products",
        "type": "mysql",
        "direction": "in",
        "commandText": "select * from Products",
        "commandType": "Text",
        "connectionStringSetting": "MySqlConnectionString"
      }
    ],
    "disabled": false
  }

The Configuration section explains these properties.

The following example is sample Python code:

import azure.functions as func
import json

def main(req: func.HttpRequest, products: func.MySqlRowList) -> func.HttpResponse:
    rows = list(map(lambda r: json.loads(r.to_json()), products))

    return func.HttpResponse(
        json.dumps(rows),
        status_code=200,
        mimetype="application/json"
    ) 

HTTP trigger, get a row by ID from a query string

The following example shows an Azure Database for MySQL input binding in a Python function that an HTTP request triggers. The binding reads from a query filtered by a parameter from the query string and returns the row in the HTTP response.

v2

The following example is sample Python code for the function_app.py file:

import azure.functions as func
import datetime
import json
import logging

app = func.FunctionApp()


@app.generic_trigger(arg_name="req", type="httpTrigger", route="getproducts/{cost}")
@app.generic_output_binding(arg_name="$return", type="http")
@app.generic_input_binding(arg_name="products", type="mysql",
                           commandText= "select * from Products where ProductId= @productId",
                           command_type="Text",
                           parameters= "@productId={productid}",
                           connection_string_setting="MySqlConnectionString")
def mysql_test(req: func.HttpRequest, products: func.MySqlRowList) -> func.HttpResponse:
    rows = list(map(lambda r: json.loads(r.to_json()), products))

    return func.HttpResponse(
        json.dumps(rows),
        status_code=200,
        mimetype="application/json"
    )

v1

The following example is binding data in the function.json file:

{
    "bindings": [
      {
        "authLevel": "function",
        "name": "req",
        "type": "httpTrigger",
        "direction": "in",
        "methods": [
          "get"
        ],
        "route": "getproducts/{productid}"
      },
      {
        "name": "$return",
        "type": "http",
        "direction": "out"
      },
      {
        "name": "products",
        "type": "mysql",
        "direction": "in",
        "commandText": "select * from Products where ProductId= @productId",
        "commandType": "Text",
        "parameters": "@productId={productid}",
        "connectionStringSetting": "MySqlConnectionString"
      }
    ],
    "disabled": false
  }

The Configuration section explains these properties.

The following example is sample Python code:

import azure.functions as func
import json

def main(req: func.HttpRequest, products: func.MySqlRowList) -> func.HttpResponse:
    rows = list(map(lambda r: json.loads(r.to_json()), products))

    return func.HttpResponse(
        json.dumps(rows),
        status_code=200,
        mimetype="application/json"
    ) 

HTTP trigger, delete rows

The following example shows an Azure Database for MySQL input binding in a function.json file and a Python function that an HTTP request triggers. The binding executes a stored procedure with input from the HTTP request's query parameter.

The stored procedure DeleteProductsCost must be created on the database. In this example, the stored procedure deletes a single record or all records, depending on the value of the parameter.

DROP PROCEDURE IF EXISTS DeleteProductsCost;

Create Procedure DeleteProductsCost(cost INT)
BEGIN
  DELETE from Products where Products.cost = cost;
END

v2

The following example is sample Python code for the function_app.py file:

import azure.functions as func
import datetime
import json
import logging

app = func.FunctionApp()


@app.generic_trigger(arg_name="req", type="httpTrigger", route="getproducts/{cost}")
@app.generic_output_binding(arg_name="$return", type="http")
@app.generic_input_binding(arg_name="products", type="mysql",
                           commandText= "DeleteProductsCost",
                           command_type="StoredProcedure",
                           parameters= "@Cost={cost}",
                           connection_string_setting="MySqlConnectionString")
def mysql_test(req: func.HttpRequest, products: func.MySqlRowList) -> func.HttpResponse:
    rows = list(map(lambda r: json.loads(r.to_json()), products))

    return func.HttpResponse(
        json.dumps(rows),
        status_code=200,
        mimetype="application/json"
    )

v1

    "bindings": [
      {
        "authLevel": "function",
        "name": "req",
        "type": "httpTrigger",
        "direction": "in",
        "methods": [
          "get"
        ],
        "route": "getproducts-storedprocedure/{cost}"
      },
      {
        "name": "$return",
        "type": "http",
        "direction": "out"
      },
      {
        "name": "products",
        "type": "mysql",
        "direction": "in",
        "commandText": "DeleteProductsCost",
        "commandType": "StoredProcedure",
        "parameters": "@Cost={cost}",
        "connectionStringSetting": "MySqlConnectionString"
      }
    ],
    "disabled": false
  }

The Configuration section explains these properties.

The following example is sample Python code:

import json
import azure.functions as func

# The input binding executes the `SELECT * FROM Products WHERE Cost = @Cost` query.
# The Parameters argument passes the `{cost}` specified in the URL that triggers the function,
# `getproducts/{cost}`, as the value of the `@Cost` parameter in the query.
# CommandType is set to `Text`, because the constructor argument of the binding is a raw query.
def main(req: func.HttpRequest, products: func.MySqlRowList) -> func.HttpResponse:
    rows = list(map(lambda r: json.loads(r.to_json()), products))

    return func.HttpResponse(
        json.dumps(rows),
        status_code=200,
        mimetype="application/json"
    )

Attributes

The C# library uses the MySqlAttribute attribute to declare the MySQL bindings on the function. The attribute has the following properties:

Attribute property	Description
CommandText	Required. The MySQL query command or name of the stored procedure that the binding executes.
ConnectionStringSetting	Required. The name of an app setting that contains the connection string for the database against which the query or stored procedure is executed. This value isn't the actual connection string and must instead resolve to an environment variable name.
CommandType	Required. A CommandType value, which is Text for a query and StoredProcedure for a stored procedure.
Parameters	Optional. Zero or more parameter values passed to the command during execution as a single string. Must follow the format @param1=param1,@param2=param2. The parameter name and parameter value can't contain a comma (,) or an equal sign (=).

Annotations

In the Java functions runtime library, use the @MySQLInput annotation on parameters whose values would come from Azure Database for MySQL. This annotation supports the following elements:

Element	Description
commandText	Required. The MySQL query command or name of the stored procedure that the binding executes.
connectionStringSetting	Required. The name of an app setting that contains the connection string for the database against which the query or stored procedure is executed. This value isn't the actual connection string and must instead resolve to an environment variable name.
commandType	Required. A CommandType value, which is Text for a query and StoredProcedure for a stored procedure.
name	Required. The unique name of the function binding.
parameters	Optional. Zero or more parameter values passed to the command during execution as a single string. Must follow the format @param1=param1,@param2=param2. The parameter name and parameter value can't contain a comma (,) or an equal sign (=).

Configuration

Model v4

The following table explains the properties that you can set on the options object passed to the input.generic() method:

Property	Description
commandText	Required. The MySQL query command or name of the stored procedure that the binding executes.
connectionStringSetting	Required. The name of an app setting that contains the connection string for the database against which the query or stored procedure is executed. This value isn't the actual connection string and must instead resolve to an environment variable name. Optional keywords in the connection string value are available to refine MySQL bindings connectivity.
commandType	Required. A CommandType value, which is Text for a query and StoredProcedure for a stored procedure.
parameters	Optional. Zero or more parameter values passed to the command during execution as a single string. Must follow the format @param1=param1,@param2=param2. The parameter name and parameter value can't contain a comma (,) or an equal sign (=).

Model v3

The following table explains the binding configuration properties that you set in the function.json file:

Property	Description
type	Required. Must be set to Mysql.
direction	Required. Must be set to in.
name	Required. The name of the variable that represents the query results in function code.
commandText	Required. The MySQL query command or name of the stored procedure that the binding executes.
connectionStringSetting	Required. The name of an app setting that contains the connection string for the database against which the query or stored procedure is executed. This value isn't the actual connection string and must instead resolve to an environment variable name. Optional keywords in the connection string value are available to refine MySQL bindings connectivity.
commandType	Required. A CommandType value, which is Text for a query and StoredProcedure for a stored procedure.
parameters	Optional. Zero or more parameter values passed to the command during execution as a single string. Must follow the format @param1=param1,@param2=param2. The parameter name and parameter value can't contain a comma (,) or an equal sign (=).

Configuration

The following table explains the binding configuration properties that you set in the function.json file:

Property	Description
type	Required. Must be set to mysql.
direction	Required. Must be set to in.
name	Required. The name of the variable that represents the query results in function code.
commandText	Required. The MySQL query command or name of the stored procedure that the binding executes.
connectionStringSetting	Required. The name of an app setting that contains the connection string for the database against which the query or stored procedure is executed. This value isn't the actual connection string and must instead resolve to an environment variable name. Optional keywords in the connection string value are available to refine MySQL bindings connectivity.
commandType	Required. A CommandType value, which is Text for a query and StoredProcedure for a stored procedure.
parameters	Optional. Zero or more parameter values passed to the command during execution as a single string. Must follow the format @param1=param1,@param2=param2. The parameter name and parameter value can't contain a comma (,) or an equal sign (=).

When you're developing locally, add your application settings in the local.settings.json file in the Values collection.

Usage

The attribute's constructor takes the MySQL command text, the command type, parameters, and the name of the connection string setting. The command can be a MySQL query with the command type System.Data.CommandType.Text or a stored procedure name with the command type System.Data.CommandType.StoredProcedure. The name of the connection string setting corresponds to the application setting (in local.settings.json for local development) that contains the connection string to Azure Database for MySQL.

If an exception occurs when an Azure Database for MySQL input binding is executed, the function code stops running. The result might be an error code, such as an HTTP trigger that returns a 500 error code.

Related content

• Save data to a database (output binding)
• Run a function from an HTTP request (trigger)