AWS Documentation » Amazon Relational Database Service (RDS) » User Guide for Aurora » Configuring Your Amazon Aurora DB Cluster » Using Amazon Aurora Serverless » Using the Data API for Aurora Serverless

Filter View: All Console AWS CLI RDS API

Using the Data API for Aurora Serverless

You can access your Aurora Serverless DB cluster using the built-in Data API. Using this API, you can access Aurora Serverless with web services–based applications, including AWS Lambda, AWS AppSync, and AWS Cloud9. For more information on these applications, see details at AWS Lambda, AWS AppSync, and AWS Cloud9.

The Data API doesn't require a persistent connection to the DB cluster. Instead, it provides a secure HTTP endpoint and integration with AWS SDKs. You can use the endpoint to run SQL statements without managing connections. All calls to the Data API are synchronous. By default, a call times out and is terminated in 45 seconds if it's not finished processing. You can use the continueAfterTimeout parameter to continue running the SQL statement after the call times out.

The API uses database credentials stored in AWS Secrets Manager, so you don't need to pass credentials in the API calls. The API also provides a more secure way to use AWS Lambda. It enables you to access your DB cluster without your needing to configure a Lambda function to access resources in a virtual private cloud (VPC). For more information about AWS Secrets Manager, see What Is AWS Secrets Manager? in the AWS Secrets Manager User Guide.

Note

When you enable the Data API, you can also use the query editor for Aurora Serverless. For more information, see Using the Query Editor for Aurora Serverless.

Availability of the Data API

The Data API is only available for the following Aurora Serverless DB clusters:

• Aurora with MySQL version 5.6 compatibility

• Aurora with PostgreSQL version 10.7 compatibility

The following table shows the AWS Regions where the Data API is currently available for Aurora Serverless. Use the HTTPS protocol to access the Data API in these AWS Regions.

Region	Link
US East (N. Virginia)	rds-data.us-east-1.amazonaws.com
US East (Ohio)	rds-data.us-east-2.amazonaws.com
US West (Oregon)	rds-data.us-west-2.amazonaws.com
Europe (Ireland)	rds-data.eu-west-1.amazonaws.com
Asia Pacific (Tokyo)	rds-data.ap-northeast-1.amazonaws.com

Authorizing Access to the Data API

A user must be authorized to access the Data API. You can authorize a user to access the Data API by adding the AmazonRDSDataFullAccess policy, a predefined AWS Identity and Access Management (IAM) policy, to that user.

You can also create an IAM policy that grants access to the Data API. After you create the policy, add it to each user that requires access to the Data API.

The following policy provides the minimum required permissions for a user to access the Data API.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "SecretsManagerDbCredentialsAccess",
            "Effect": "Allow",
            "Action": [
                "secretsmanager:GetSecretValue",
                "secretsmanager:PutResourcePolicy",
                "secretsmanager:PutSecretValue",
                "secretsmanager:DeleteSecret",
                "secretsmanager:DescribeSecret",
                "secretsmanager:TagResource"
            ],
            "Resource": "arn:aws:secretsmanager:*:*:secret:rds-db-credentials/*"
        },
        {
            "Sid": "RDSDataServiceAccess",
            "Effect": "Allow",
            "Action": [
                "secretsmanager:CreateSecret",
                "secretsmanager:ListSecrets",
                "secretsmanager:GetRandomPassword",
                "tag:GetResources",
                "rds-data:BatchExecuteStatement",
                "rds-data:BeginTransaction",
                "rds-data:CommitTransaction",
                "rds-data:ExecuteStatement",
                "rds-data:RollbackTransaction"
            ],
            "Resource": "*"
        }
    ]
}                
            

For information about creating an IAM policy, see Creating IAM Policies in the IAM User Guide.

For information about adding an IAM policy to a user, see Adding and Removing IAM Identity Permissions in the IAM User Guide.

Enabling the Data API

To use the Data API, enable it for your Aurora Serverless DB cluster. You can enable the Data API when you create or modify the DB cluster.

Console

You can enable the Data API by using the RDS console when you create or modify an Aurora Serverless DB cluster. When you create an Aurora Serverless DB cluster, you do so by enabling the Data API in the RDS console's Connectivity section. When you modify an Aurora Serverless DB cluster, you do so by enabling the Data API in the RDS console's Network & Security section.

The following screenshot shows the enabled Data API when modifying an Aurora Serverless DB cluster.

For instructions, see Creating an Aurora Serverless DB Cluster and Modifying an Aurora Serverless DB Cluster.

AWS CLI

When you create or modify an Aurora Serverless DB cluster using AWS CLI commands, the Data API is enabled when you specify -enable-http-endpoint.

You can specify the -enable-http-endpoint using the following AWS CLI commands:

• create-db-cluster

• modify-db-cluster

The following example modifies sample-cluster to enable the Data API.

For Linux, OS X, or Unix:

aws rds modify-db-cluster \
    --db-cluster-identifier sample-cluster \
    --enable-http-endpoint
   

For Windows:

aws rds modify-db-cluster ^
    --db-cluster-identifier sample-cluster ^
    --enable-http-endpoint
   

RDS API

When you create or modify an Aurora Serverless DB cluster using Amazon RDS API operations, you enable the Data API by setting the EnableHttpEndpoint value to true.

You can set the EnableHttpEndpoint value using the following API operations:

• CreateDBCluster

• ModifyDBCluster

Storing Database Credentials in AWS Secrets Manager

When you call the Data API, you can pass credentials for the Aurora Serverless DB cluster by using a secret in AWS Secrets Manager. To pass credentials in this way, you specify the name of the secret or the Amazon Resource Name (ARN) of the secret.

To store DB cluster credentials in a secret

1. Use AWS Secrets Manager to create a secret that contains credentials for the Aurora DB cluster.

   For instructions, see Creating a Basic Secret in the AWS Secrets Manager User Guide.

2. Use the AWS Secrets Manager console to view the details for the secret you created, or run the aws secretsmanager describe-secret AWS CLI command.

   Note the name and ARN of the secret. You can use them in calls to the Data API.

Calling the Data API

After you enable the Data API for an Aurora Serverless DB cluster, you can call the Data API or the AWS CLI to run SQL statements on the DB cluster. The Data API supports the programming languages supported by the AWS SDK. For more information, see Tools to Build on AWS.

The Data API provides the following operations to execute SQL statements.

Data API Operation	AWS CLI Command	Description
ExecuteStatement	aws rds-data execute-statement	Runs a SQL statement against a database.
BatchExecuteStatement	aws rds-data batch-execute-statement	Runs a batch SQL statement over an array of data for bulk update and insert operations. You can run a DML statement with array of parameter sets. A batch SQL statement can provide a significant performance improvement over individual insert and update statements.

You can run both operations for executing a SQL statement independently, or you can run them in a transaction. The Data API provides the following operations to support transactions.

Data API Operation	AWS CLI Command	Description
BeginTransaction	aws rds-data begin-transaction	Starts a SQL transaction.
CommitTransaction	aws rds-data commit-transaction	Ends a SQL transaction and commits the changes.
RollbackTransaction	aws rds-data rollback-transaction	Performs a rollback of a transaction.

The operations for executing SQL statements and supporting transactions have the following common Data API parameters and AWS CLI options. Some operations support other parameters or options.

Data API Operation Parameter	AWS CLI Command Option	Required	Description
resourceArn	--resource-arn	Yes	The Amazon Resource Name (ARN) of the Aurora Serverless DB cluster.
secretArn	--secret-arn	Yes	The name or ARN of the secret that enables access to the DB cluster.

You can use parameters in Data API calls to ExecuteStatement and BatchExecuteStatement, and when you run the AWS CLI commands execute-statement and batch-execute-statement. To use a parameter, you specify a name-value pair in the SqlParameter data type. You specify the value with the Field data type. The following table maps Java Database Connectivity (JDBC) data types to the data types you specify in Data API calls.

JDBC Data Type	Data API Data Type
INTEGER, TINYINT, SMALLINT, BIGINT	LONG
FLOAT, REAL, DOUBLE	DOUBLE
DECIMAL	STRING
BOOLEAN, BIT	BOOLEAN
BLOB, BINARY, LONGVARBINARY, VARBINARY	BLOB
CLOB	STRING
Other types (including types related to date and time)	STRING

For some specific types, such as DECIMAL or TIME, a hint might be required to instruct the Data API that the String value should be passed to the database as a different type. You can do this by including values in typeHint in the SqlParameter data type. The possible values for typeHint are the following:

• DECIMAL – The corresponding String parameter value is sent as an object of DECIMAL type to the database.

• TIMESTAMP – The corresponding String parameter value is sent as an object of TIMESTAMP type to the database. The accepted format is YYYY-MM-DD HH:MM:SS[.FFF].

• TIME – The corresponding String parameter value is sent as an object of TIME type to the database. The accepted format is HH:MM:SS[.FFF].

• DATE – The corresponding String parameter value is sent as an object of DATE type to the database. The accepted format is YYYY-MM-DD.

Note

These examples are not exhaustive.

Calling the Data API with the AWS CLI

You can call the Data API using the AWS Command Line Interface (AWS CLI).

The following examples use the AWS CLI for the Data API. For more information, see AWS Command Line Interface Reference for the Data API.

In each example, replace the DB cluster ARN with the ARN for your Aurora Serverless DB cluster. Also, replace the secret ARN with the ARN of the secret in AWS Secrets Manager that allows access to the DB cluster.

Note

The AWS CLI can format responses in JSON.

Topics

• Starting a SQL Transaction
• Running a SQL Statement
• Running a Batch SQL Statement Over an Array of Data
• Committing a SQL Transaction
• Rolling Back a SQL Transaction

Starting a SQL Transaction

You can start a SQL transaction using the aws rds-data begin-transaction CLI command. The call returns a transaction identifier.

Important

A transaction times out if there are no calls that use its transaction ID in three minutes. If a transaction times out before it's committed, it's rolled back automatically.

DDL statements inside a transaction cause an implicit commit. We recommend that you run each DDL statement in a separate execute-statement command with the --continue-after-timeout option.

In addition to the common options, specify the following option:

• --database (optional) – The name of the database.

For example, the following CLI command starts a SQL transaction.

For Linux, OS X, or Unix:

aws rds-data begin-transaction --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret"
            

For Windows:

aws rds-data begin-transaction --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret"
            

The following is an example of the response.

{
    "transactionId": "ABC1234567890xyz"
}                 
            

Running a SQL Statement

You can run a SQL statement using the aws rds-data execute-statement CLI command.

You can run the SQL statement in a transaction by specifying the transaction identifier with the --transaction-id option. You can start a transaction using the aws rds-data begin-transaction CLI command. You can end and commit a transaction using the aws rds-data commit-transaction CLI command.

Important

If you don't specify the --transaction-id option, changes that result from the call are committed automatically.

In addition to the common options, specify the following options:

• --sql (required) – A SQL statement to run on the DB cluster.

• --transaction-id (optional) – The identifier of a transaction that was started using the begin-transaction CLI command. Specify the transaction ID of the transaction that you want to include the SQL statement in.

• --parameters (optional) – The parameters for the SQL statement.

• --include-result-metadata | --no-include-result-metadata (optional) – A value that indicates whether to include metadata in the results. The default is --no-include-result-metadata.

• --database (optional) – The name of the database.

• --continue-after-timeout | --no-continue-after-timeout (optional) – A value that indicates whether to continue running the statement after the call times out. The default is --no-continue-after-timeout.

  For data definition language (DDL) statements, we recommend continuing to run the statement after the call times out to avoid errors and the possibility of corrupted data structures.

The DB cluster returns a response for the call.

Note

The response size limit is 1 MB or 1,000 records. If the call returns more than 1 MB of response data or over 1,000 records, the call is terminated.

For example, the following CLI command runs a single SQL statement and omits the metadata in the results (the default).

For Linux, OS X, or Unix:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" \
--sql "select * from mytable"
            

For Windows:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" ^
--sql "select * from mytable"
            

The following is an example of the response.

{
    "numberOfRecordsUpdated": 0,
    "records": [
        [
            {
                "longValue": 1
            },
            {
                "stringValue": "ValueOne"
            }
        ],
        [
            {
                "longValue": 2
            },
            {
                "stringValue": "ValueTwo"
            }
        ],
        [
            {
                "longValue": 3
            },
            {
                "stringValue": "ValueThree"
            }
        ]
    ]
}
                

The following CLI command runs a single SQL statement in a transaction by specifying the --transaction-id option.

For Linux, OS X, or Unix:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" \
--sql "update mytable set quantity=5 where id=201" --transaction-id "ABC1234567890xyz"
            

For Windows:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" ^
--sql "update mytable set quantity=5 where id=201" --transaction-id "ABC1234567890xyz"
            

The following is an example of the response.

{
    "numberOfRecordsUpdated": 1
}                
            

The following CLI command runs a single SQL statement with parameters.

For Linux, OS X, or Unix:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" \
--sql "insert into mytable values (:id, :val)" --parameters "[{\"name\": \"id\", \"value\": {\"longValue\": 1}},{\"name\": \"val\", \"value\": {\"stringValue\": \"value1\"}}]"
            

For Windows:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" ^
--sql "insert into mytable values (:id, :val)" --parameters "[{\"name\": \"id\", \"value\": {\"longValue\": 1}},{\"name\": \"val\", \"value\": {\"stringValue\": \"value1\"}}]"
            

The following is an example of the response.

{
    "numberOfRecordsUpdated": 1
}   
                

The following CLI command runs a data definition language (DDL) SQL statement. The DDL statement renames column job to column role.

Important

For DDL statements, we recommend continuing to run the statement after the call times out. When a DDL statement terminates before it is finished running, it can result in errors and possibly corrupted data structures. To continue running a statement after a call times out, specify the --continue-after-timeout option.

For Linux, OS X, or Unix:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" \
--sql "alter table mytable change column job role varchar(100)" --continue-after-timeout
            

For Windows:

aws rds-data execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" ^
--sql "alter table mytable change column job role varchar(100)" --continue-after-timeout
            

The following is an example of the response.

{
    "generatedFields": [],
    "numberOfRecordsUpdated": 0
}
                

Note

The generatedFields data isn't supported by Aurora PostgreSQL. To get the values of generated fields, use the RETURNING clause. For more information, see Returning Data From Modified Rows in the PostgreSQL documentation.

Running a Batch SQL Statement Over an Array of Data

You can run a batch SQL statement over an array of data by using the aws rds-data batch-execute-statement CLI command. You can use this command to perform a bulk import or update operation.

You can run the SQL statement in a transaction by specifying the transaction identifier with the --transaction-id option. You can start a transaction by using the aws rds-data begin-transaction CLI command. You can end and commit a transaction by using the aws rds-data commit-transaction CLI command.

Important

If you don't specify the --transaction-id option, changes that result from the call are committed automatically.

In addition to the common options, specify the following options:

• --sql (required) – A SQL statement to run on the DB cluster.

• --transaction-id (optional) – The identifier of a transaction that was started using the begin-transaction CLI command. Specify the transaction ID of the transaction that you want to include the SQL statement in.

• --parameter-set (optional) – The parameter sets for the batch operation.

• --database (optional) – The name of the database.

The DB cluster returns a response to the call.

Note

The response size limit is 1 MB or 1,000 records. If the call returns more than 1 MB of response data or over 1,000 records, the call is terminated.

For example, the following CLI command runs a batch SQL statement over an array of data with a parameter set.

For Linux, OS X, or Unix:

aws rds-data batch-execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" \
--sql "insert into mytable values (:id, :val)" \
--parameter-sets "[[{\"name\": \"id\", \"value\": {\"longValue\": 1}},{\"name\": \"val\", \"value\": {\"stringValue\": \"ValueOne\"}}],
[{\"name\": \"id\", \"value\": {\"longValue\": 2}},{\"name\": \"val\", \"value\": {\"stringValue\": \"ValueTwo\"}}],
[{\"name\": \"id\", \"value\": {\"longValue\": 3}},{\"name\": \"val\", \"value\": {\"stringValue\": \"ValueThree\"}}]]"
            

For Windows:

aws rds-data batch-execute-statement --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--database "mydb" --secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" ^
--sql "insert into mytable values (:id, :val)" ^
--parameter-sets "[[{\"name\": \"id\", \"value\": {\"longValue\": 1}},{\"name\": \"val\", \"value\": {\"stringValue\": \"ValueOne\"}}],
[{\"name\": \"id\", \"value\": {\"longValue\": 2}},{\"name\": \"val\", \"value\": {\"stringValue\": \"ValueTwo\"}}],
[{\"name\": \"id\", \"value\": {\"longValue\": 3}},{\"name\": \"val\", \"value\": {\"stringValue\": \"ValueThree\"}}]]"
            

Note

Don't include line breaks in the --parameter-sets option.

Committing a SQL Transaction

Using the aws rds-data commit-transaction CLI command, you can end a SQL transaction that you started with aws rds-data begin-transaction and commit the changes.

In addition to the common options, specify the following option:

• --transaction-id (required) – The identifier of a transaction that was started using the begin-transaction CLI command. Specify the transaction ID of the transaction that you want to end and commit.

For example, the following CLI command ends a SQL transaction and commits the changes.

For Linux, OS X, or Unix:

aws rds-data commit-transaction --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" \
--transaction-id "ABC1234567890xyz"
            

For Windows:

aws rds-data commit-transaction --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" ^
--transaction-id "ABC1234567890xyz"
            

The following is an example of the response.

{
    "transactionStatus": "Transaction Committed"
}                
            

Rolling Back a SQL Transaction

Using the aws rds-data rollback-transaction CLI command, you can roll back a SQL transaction that you started with aws rds-data begin-transaction. Rolling back a transaction cancels its changes.

Important

If the transaction ID has expired, the transaction was rolled back automatically. In this case, an aws rds-data rollback-transaction command that specifies the expired transaction ID returns an error.

In addition to the common options, specify the following option:

• --transaction-id (required) – The identifier of a transaction that was started using the begin-transaction CLI command. Specify the transaction ID of the transaction that you want to roll back.

For example, the following AWS CLI command rolls back a SQL transaction.

For Linux, OS X, or Unix:

aws rds-data rollback-transaction --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" \
--secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" \
--transaction-id "ABC1234567890xyz"
            

For Windows:

aws rds-data rollback-transaction --resource-arn "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster" ^
--secret-arn "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret" ^
--transaction-id "ABC1234567890xyz"
            

The following is an example of the response.

{
    "transactionStatus": "Rollback Complete"
}                
            

Calling the Data API from a Python Application

You can call the Data API from a Python application.

The following examples use the AWS SDK for Python (Boto). For more information about Boto, see the AWS SDK for Python (Boto 3) Documentation.

In each example, replace the DB cluster's Amazon Resource Name (ARN) with the ARN for your Aurora Serverless DB cluster. Also, replace the secret ARN with the ARN of the secret in AWS Secrets Manager that allows access to the DB cluster.

Topics

• Running a SQL Query
• Running a DML SQL Statement
• Running a SQL Transaction

Running a SQL Query

You can run a SELECT statement and fetch the results with a Python application.

The following example runs a SQL query.

import boto3 

rdsData = boto3.client('rds-data')

cluster_arn = 'arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster' 
secret_arn = 'arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret' 
 
response1 = rdsData.execute_statement(
            resourceArn = cluster_arn, 
            secretArn = secret_arn, 
            database = 'mydb', 
            sql = 'select * from employees limit 3')

print (response1['records'])
[
    [
        {
            'longValue': 1
        }, 
        {
            'stringValue': 'ROSALEZ'
        },
        {
            'stringValue': 'ALEJANDRO'
        },
        {
            'stringValue': '2016-02-15 04:34:33.0'
        }
    ], 
    [
        {
            'longValue': 1
        }, 
        {
            'stringValue': 'DOE'
        },
        {
            'stringValue': 'JANE'
        },
        {
            'stringValue': '2014-05-09 04:34:33.0'
        }
    ], 
    [
        {
            'longValue': 1
        }, 
        {
            'stringValue': 'STILES'
        },
        {
            'stringValue': 'JOHN'
        },
        {
            'stringValue': '2017-09-20 04:34:33.0'
        }
    ]
]
                

Running a DML SQL Statement

You can run a data manipulation language (DML) statement to insert, update, or delete data in your database. You can also use parameters in DML statements.

Important

If a call isn't part of a transaction because it doesn't include the transactionID parameter, changes that result from the call are committed automatically.

The following example runs an insert SQL statement and uses parameters.

import boto3 

rdsData = boto3.client('rds-data')

cluster_arn = 'arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster' 
secret_arn = 'arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret' 

response2 = rdsData.execute_statement(
            resourceArn = cluster_arn, 
            secretArn = secret_arn, 
            database = 'mydb', 
            sql = 'insert into employees(first_name, last_name) VALUES(:firstname, :lastname)')
param1 = {'name':'firstname', 'value':{'stringValue': 'JACKSON'}}
param2 = {'name':'lastname', 'value':{'stringValue': 'MATEO'}}
paramSet = [param1, param2]
response2 = rdsData.execute_statement(
            resourceArn = cluster_arn, 
            secretArn = secret_arn, 
            database = 'mydb', 
            parameters = paramSet,
            sql = 'insert into employees(first_name, last_name) VALUES(:firstname, :lastname)')
'numberOfRecordsUpdated': 1}

response2['numberOfRecordsUpdated']
1
                

Running a SQL Transaction

You can start a SQL transaction, run one or more SQL statements, and then commit the changes with a Python application.

Important

A transaction times out if there are no calls that use its transaction ID in three minutes. If a transaction times out before it's committed, it's rolled back automatically.

If you don't specify a transaction ID, changes that result from the call are committed automatically.

The following example runs a SQL transaction that inserts a row in a table.

import boto3 

rdsData = boto3.client('rds-data')

cluster_arn = 'arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster' 
secret_arn = 'arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret' 

tr = rdsData.begin_transaction(
     resourceArn = cluster_arn, 
     secretArn = secret_arn, 
     database = 'mydb') 
 
response3 = rdsData.execute_statement(
     resourceArn = cluster_arn, 
     secretArn = secret_arn, 
     database = 'mydb', 
     sql = 'insert into employees(first_name, last_name) values('XIULAN', 'WANG')', 
     transactionId = tr['transactionId']) 
 
cr = rdsData.commit_transaction(
     resourceArn = cluster_arn, 
     secretArn = secret_arn, 
     transactionId = tr['transactionId']) 
 
cr['transactionStatus'] 
'Transaction Committed' 
 
response3['numberOfRecordsUpdated'] 
1
                

Note

If you run a data definition language (DDL) statement, we recommend continuing to run the statement after the call times out. When a DDL statement terminates before it is finished running, it can result in errors and possibly corrupted data structures. To continue running a statement after a call times out, set the continueAfterTimeout parameter to true.

Calling the Data API from a Java Application

You can call the Data API from a Java application.

The following examples use the AWS SDK for Java. For more information, see the AWS SDK for Java Developer Guide.

In each example, replace the DB cluster's Amazon Resource Name (ARN) with the ARN for your Aurora Serverless DB cluster. Also, replace the secret ARN with the ARN of the secret in AWS Secrets Manager that allows access to the DB cluster.

Topics

• Running a SQL Query
• Running a SQL Transaction
• Running a Batch SQL Operation

Running a SQL Query

You can run a SELECT statement and fetch the results with a Java application.

The following example runs a SQL query.

package com.amazonaws.rdsdata.examples;

import com.amazonaws.services.rdsdata.AWSRDSData;
import com.amazonaws.services.rdsdata.AWSRDSDataClient;
import com.amazonaws.services.rdsdata.model.ExecuteStatementRequest;
import com.amazonaws.services.rdsdata.model.ExecuteStatementResult;
import com.amazonaws.services.rdsdata.model.Field;

import java.util.List;

public class FetchResultsExample {
  public static final String RESOURCE_ARN = "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster";
  public static final String SECRET_ARN = "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret";

  public static void main(String[] args) {
    AWSRDSData rdsData = AWSRDSDataClient.builder().build();

    ExecuteStatementRequest request = new ExecuteStatementRequest()
            .withResourceArn(RESOURCE_ARN)
            .withSecretArn(SECRET_ARN)
            .withDatabase("mydb")
            .withSql("select * from mytable");

    ExecuteStatementResult result = rdsData.executeStatement(request);

    for (List<Field> fields: result.getRecords()) {
      String stringValue = fields.get(0).getStringValue();
      long numberValue = fields.get(1).getLongValue();

      System.out.println(String.format("Fetched row: string = %s, number = %d", stringValue, numberValue));
    }
  }
}
                

Running a SQL Transaction

You can start a SQL transaction, run one or more SQL statements, and then commit the changes with a Java application.

Important

A transaction times out if there are no calls that use its transaction ID in three minutes. If a transaction times out before it's committed, it's rolled back automatically.

If you don't specify a transaction ID, changes that result from the call are committed automatically.

The following example runs a SQL transaction.

package com.amazonaws.rdsdata.examples;

import com.amazonaws.services.rdsdata.AWSRDSData;
import com.amazonaws.services.rdsdata.AWSRDSDataClient;
import com.amazonaws.services.rdsdata.model.BeginTransactionRequest;
import com.amazonaws.services.rdsdata.model.BeginTransactionResult;
import com.amazonaws.services.rdsdata.model.CommitTransactionRequest;
import com.amazonaws.services.rdsdata.model.ExecuteStatementRequest;

public class TransactionExample {
  public static final String RESOURCE_ARN = "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster";
  public static final String SECRET_ARN = "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret";

  public static void main(String[] args) {
    AWSRDSData rdsData = AWSRDSDataClient.builder().build();

    BeginTransactionRequest beginTransactionRequest = new BeginTransactionRequest()
            .withResourceArn(RESOURCE_ARN)
            .withSecretArn(SECRET_ARN)
            .withDatabase("mydb");
    BeginTransactionResult beginTransactionResult = rdsData.beginTransaction(beginTransactionRequest);
    String transactionId = beginTransactionResult.getTransactionId();

    ExecuteStatementRequest executeStatementRequest = new ExecuteStatementRequest()
            .withTransactionId(transactionId)
            .withResourceArn(RESOURCE_ARN)
            .withSecretArn(SECRET_ARN)
            .withSql("INSERT INTO test_table VALUES ('hello world!')");
    rdsData.executeStatement(executeStatementRequest);

    CommitTransactionRequest commitTransactionRequest = new CommitTransactionRequest()
            .withTransactionId(transactionId)
            .withResourceArn(RESOURCE_ARN)
            .withSecretArn(SECRET_ARN);
    rdsData.commitTransaction(commitTransactionRequest);
  }
}                    
                

Note

If you run a data definition language (DDL) statement, we recommend continuing to run the statement after the call times out. When a DDL statement terminates before it is finished running, it can result in errors and possibly corrupted data structures. To continue running a statement after a call times out, set the continueAfterTimeout parameter to true.

Running a Batch SQL Operation

You can run bulk insert and update operations over an array of data with a Java application. You can run a DML statement with array of parameter sets.

Important

If you don't specify a transaction ID, changes that result from the call are committed automatically.

The following example runs a batch insert operation.

package com.amazonaws.rdsdata.examples;

import com.amazonaws.services.rdsdata.AWSRDSData;
import com.amazonaws.services.rdsdata.AWSRDSDataClient;
import com.amazonaws.services.rdsdata.model.BatchExecuteStatementRequest;
import com.amazonaws.services.rdsdata.model.Field;
import com.amazonaws.services.rdsdata.model.SqlParameter;

import java.util.Arrays;

public class BatchExecuteExample {
  public static final String RESOURCE_ARN = "arn:aws:rds:us-east-1:123456789012:cluster:mydbcluster";
  public static final String SECRET_ARN = "arn:aws:secretsmanager:us-east-1:123456789012:secret:mysecret";

  public static void main(String[] args) {
      AWSRDSData rdsData = AWSRDSDataClient.builder().build();

    BatchExecuteStatementRequest request = new BatchExecuteStatementRequest()
            .withDatabase("test")
            .withResourceArn(RESOURCE_ARN)
            .withSecretArn(SECRET_ARN)
            .withSql("INSERT INTO test_table2 VALUES (:string, :number)")
            .withParameterSets(Arrays.asList(
                    Arrays.asList(
                            new SqlParameter().withName("string").withValue(new Field().withStringValue("Hello")),
                            new SqlParameter().withName("number").withValue(new Field().withLongValue(1L))
                    ),
                    Arrays.asList(
                            new SqlParameter().withName("string").withValue(new Field().withStringValue("World")),
                            new SqlParameter().withName("number").withValue(new Field().withLongValue(2L))
                    )
            ));

    rdsData.batchExecuteStatement(request);
  }
}  
                

Using the Java Client Library for Data API (Preview)

This is prerelease documentation for a service in preview release. It is subject to change.

You can download and use a Java client library for the Data API. The Java client library provides an alternative way to use the Data API. Using this library, you can map your client-side classes to requests and responses of the Data API. This mapping support can ease integration with some specific Java types, such as Date, Time, and BigDecimal.

Downloading the Java Client Library for Data API

The Data API Java client library is open source in GitHub. You can build the library manually from the source files, but the best practice is to consume the library using Apache Maven dependency management. To do this, use the following procedure.

To use the Data API in your application as a dependency

1. Download and install Apache Maven. For more information, see Downloading Apache Maven and Installing Apache Maven in the Maven documentation.

2. Add the Data API Maven repository to your application's Project Object Model (POM) file as shown following.

   <!--Dependency:-->
   <dependencies>
       <dependency>
          <groupId>com.amazonaws</groupId>
          <artifactId>rdsdata-client-library</artifactId>
          <version>1.0</version>
       </dependency>
   </dependencies>
   <!--Custom repository:-->
   <repositories>
       <repository>
          <id>rdsdata-client-repository</id>
          <name>RDS Data Client Library Release Repository</name>
          <url>https://rds-data-client-library-java.s3.amazonaws.com/maven/release</url>
       </repository>
   </repositories>
                           

Java Client Library Examples

Following, you can find some common examples of using the Data API Java client library. These examples assume that you have a table accounts with two columns: accountId and balance. You also have the following data transfer object (DTO).

@Value
    public class Account {
        String accountId;
        double balance;
    }                    
                

The client library enables you to pass DTOs as input parameters. The following example shows how customer DTOs are mapped to input parameters sets.

var account1 = new Account("A-1", 1.1);
var account2 = new Account("B-2", 100);
client.forSql("INSERT INTO accounts(accountId, balance) VALUES(:accountId, :balance)")
         .withParams(account1, account2)
         .execute();                
                

In some cases, it's easier to work with simple values as input parameters. You can do so with the following syntax.

client.forSql("INSERT INTO accounts(accountId, balance) VALUES(:accountId, :balance)")
         .withParam("accountId", "A-1")
         .withParam("balance", 12.2)
         .execute();              
                

The following is another example that works with simple values as input parameters.

client.forSql("INSERT INTO accounts(accountId, balance) VALUES(?, ?", "A-1", 12.2)
         .execute();            
                

The client library provides automatic mapping to DTOs when an execution result is returned. The following examples show how the execution result is mapped to your DTOs.

List<Account> result = client.forSql("SELECT * FROM accounts")
          .execute()
          .mapToList(Account.class);
          
Account result = client.forSql("SELECT * FROM accounts WHERE account_id = '1'")
          .execute()
          .mapToSingle(Account.class);          
                

Troubleshooting Data API Issues

Use the following sections, titled with common error messages, to help troubleshoot problems that you have with the Data API.

Note

If you have questions or comments related to the Data API, send email to [e-mail].

Topics

• Transaction <transaction_ID> Is Not Found
• Packet for Query Is Too Large
• Query Response Exceeded Limit of Number of Records
• Database Response Exceeded Size Limit
• HttpEndpoint Is Not Enabled for Cluster <cluster_ID>

Transaction <transaction_ID> Is Not Found

In this case, the transaction ID specified in a Data API call wasn't found. The cause for this issue is almost always one of the following:

• The specified transaction ID wasn't created by a BeginTransaction call.

• The specified transaction ID has expired.

  A transaction expires if no call uses the transaction ID within three minutes.

To solve the issue, make sure that your call has a valid transaction ID. Also make sure that each transaction call runs within three minutes of the last one.

For information about running transactions, see Calling the Data API.

Packet for Query Is Too Large

In this case, the result set returned for a row was too large. The Data API size limit is 64 KB per row in the result set returned by the database.

To solve this issue, make sure that each row in a result set is 64 KB or less.

Query Response Exceeded Limit of Number of Records

In this case, the number of rows in the result set returned was too large. The Data API limit is 1,000 rows in the result set returned by the database.

To solve this issue, make sure that calls to the Data API return 1,000 rows or less. If you need to return more than 1,000 rows, you can use multiple ExecuteStatement calls with the LIMIT clause in your query.

For more information about the LIMIT clause, see SELECT Syntax in the MySQL documentation.

Database Response Exceeded Size Limit

In this case, the size of the result set returned by the database was too large. The Data API limit is 1 MB in the result set returned by the database.

To solve this issue, make sure that calls to the Data API return 1 MB of data or less. If you need to return more than 1 MB, you can use multiple ExecuteStatement calls with the LIMIT clause in your query.

For more information about the LIMIT clause, see SELECT Syntax in the MySQL documentation.

HttpEndpoint Is Not Enabled for Cluster <cluster_ID>

The cause for this issue is almost always one of the following:

• The Data API isn't enabled for the Aurora Serverless DB cluster. To use the Data API with an Aurora Serverless DB cluster, the Data API must be enabled for the DB cluster.

• The DB cluster was renamed after the Data API was enabled for it.

If the Data API has not been enabled for the DB cluster, enable it.

If the DB cluster was renamed after the Data API was enabled for the DB cluster, disable the Data API and then enable it again.

For information about enabling the Data API, see Enabling the Data API.