Run Transactions Through the ScalarDB Core Library
This guide explains how to configure your ScalarDB properties file and create schemas to run transactions through a one-phase or a two-phase commit interface by using the ScalarDB Core library.
Preparation​
For the purpose of this guide, you will set up a database and ScalarDB by using a sample in the ScalarDB samples repository.
Clone the ScalarDB samples repository​
Open Terminal, then clone the ScalarDB samples repository by running the following command:
git clone https://github.com/scalar-labs/scalardb-samples
Then, go to the directory that contains the necessary files by running the following command:
cd scalardb-samples/scalardb-sample
Set up a database​
Select your database, and follow the instructions to configure it for ScalarDB.
For a list of databases that ScalarDB supports, see Databases.
- MySQL
- PostgreSQL
- Oracle Database
- SQL Server
- DynamoDB
- Cosmos DB for NoSQL
- Cassandra
Run MySQL locally
You can run MySQL in Docker Compose by using the docker-compose.yml file in the scalardb-samples/scalardb-sample directory.
To start MySQL, run the following command:
docker compose up -d mysql
Configure ScalarDB
The database.properties file in the scalardb-samples/scalardb-sample directory contains database configurations for ScalarDB. Please uncomment the properties for MySQL in the database.properties file so that the configuration looks as follows:
# For MySQL
scalar.db.storage=jdbc
scalar.db.contact_points=jdbc:mysql://localhost:3306/
scalar.db.username=root
scalar.db.password=mysql
Run PostgreSQL locally
You can run PostgreSQL in Docker Compose by using the docker-compose.yml file in the scalardb-samples/scalardb-sample directory.
To start PostgreSQL, run the following command:
docker compose up -d postgres
Configure ScalarDB
The database.properties file in the scalardb-samples/scalardb-sample directory contains database configurations for ScalarDB. Please uncomment the properties for PostgreSQL in the database.properties file so that the configuration looks as follows:
# For PostgreSQL
scalar.db.storage=jdbc
scalar.db.contact_points=jdbc:postgresql://localhost:5432/
scalar.db.username=postgres
scalar.db.password=postgres
Run Oracle Database locally
You can run Oracle Database in Docker Compose by using the docker-compose.yml file in the scalardb-samples/scalardb-sample directory.
To start Oracle Database, run the following command:
docker compose up -d oracle
Configure ScalarDB
The database.properties file in the scalardb-samples/scalardb-sample directory contains database configurations for ScalarDB. Please uncomment the properties for Oracle Database in the database.properties file so that the configuration looks as follows:
# For Oracle
scalar.db.storage=jdbc
scalar.db.contact_points=jdbc:oracle:thin:@//localhost:1521/FREEPDB1
scalar.db.username=SYSTEM
scalar.db.password=Oracle
Run SQL Server locally
You can run SQL Server in Docker Compose by using the docker-compose.yml file in the scalardb-samples/scalardb-sample directory.
To start SQL Server, run the following command:
docker compose up -d sqlserver
Configure ScalarDB
The database.properties file in the scalardb-samples/scalardb-sample directory contains database configurations for ScalarDB. Please uncomment the properties for SQL Server in the database.properties file so that the configuration looks as follows:
# For SQL Server
scalar.db.storage=jdbc
scalar.db.contact_points=jdbc:sqlserver://localhost:1433;encrypt=true;trustServerCertificate=true
scalar.db.username=sa
scalar.db.password=SqlServer22
Run Amazon DynamoDB Local
You can run Amazon DynamoDB Local in Docker Compose by using the docker-compose.yml file in the scalardb-samples/scalardb-sample directory.
To start Amazon DynamoDB Local, run the following command:
docker compose up -d dynamodb
Configure ScalarDB
The database.properties file in the scalardb-samples/scalardb-sample directory contains database configurations for ScalarDB. Please uncomment the properties for Amazon DynamoDB Local in the database.properties file so that the configuration looks as follows:
# For DynamoDB Local
scalar.db.storage=dynamo
scalar.db.contact_points=sample
scalar.db.username=sample
scalar.db.password=sample
scalar.db.dynamo.endpoint_override=http://localhost:8000
To use Azure Cosmos DB for NoSQL, you must have an Azure account. If you don't have an Azure account, visit Create an Azure Cosmos DB account.
Configure Cosmos DB for NoSQL
Set the default consistency level to Strong according to the official document at Configure the default consistency level.
Configure ScalarDB
The following instructions assume that you have properly installed and configured the JDK in your local environment and properly configured your Cosmos DB for NoSQL account in Azure.
The database.properties file in the scalardb-samples/scalardb-sample directory contains database configurations for ScalarDB. Be sure to change the values for scalar.db.contact_points and scalar.db.password as described.
# For Cosmos DB
scalar.db.storage=cosmos
scalar.db.contact_points=<COSMOS_DB_FOR_NOSQL_URI>
scalar.db.password=<COSMOS_DB_FOR_NOSQL_KEY>
You can use the primary key or the secondary key in your Azure Cosmos DB account as the value for scalar.db.password.
Run Cassandra locally
You can run Apache Cassandra in Docker Compose by using the docker-compose.yml file in the scalardb-samples/scalardb-sample directory.
To start Apache Cassandra, run the following command:
docker compose up -d cassandra
Configure ScalarDB
The database.properties file in the scalardb-samples/scalardb-sample directory contains database configurations for ScalarDB. Please uncomment the properties for Cassandra in the database.properties file so that the configuration looks as follows:
# For Cassandra
scalar.db.storage=cassandra
scalar.db.contact_points=localhost
scalar.db.username=cassandra
scalar.db.password=cassandra
For a comprehensive list of configurations for ScalarDB, see ScalarDB Configurations.
Create or import a schema​
ScalarDB has its own data model and schema that maps to the implementation-specific data model and schema.
- Need to create a database schema? See ScalarDB Schema Loader.
- Need to import an existing database? See Importing Existing Tables to ScalarDB by Using ScalarDB Schema Loader.
Run transactions by using Java​
- Want to run transactions by using a one-phase commit interface? See the ScalarDB Java API Guide.
- Want to run transactions by using a two-phase commit interface? See Transactions with a Two-Phase Commit Interface.