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This API returns a database connection definition object that can be passed to some SQL and Data APIs to specify the desired database connection. 

Parameters

1. Database connection name (String/optional). A name corresponding to an entry in the databaseConnections configuration

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1. option.
   
   If

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1. this parameter is omitted, then the default database connection definition is returned. In Profound.js Spaces, the default database connection is normally the workspace's built-in MariaDB database. However, if the Profound.js Spaces workspace is called from IBM i using the NODERUN command, the default database connection is overridden to work with the calling IBM i database. In this case the workspace's built-in MariaDB database can be accessed by passing connection name "workspace".

Return Value

A database connection definition object that can be passed to the following APIs:

pjs.query()
pjs.parallelQueries()
pjs.allocStmt()
pjs.prepare()
pjs.setConnectAttr()
pjs.getConnection()
pjs.createDataArea()
pjs.retrieveDataArea()
pjs.setDataArea()
pjs.data.add()
pjs.data.get()
pjs.data.getCount()
pjs.data.delete()
pjs.data.update()

The return value is passed to the above APIs as the first parameter, followed by the other parameters as documented for each API.

The database connection definition object also has a property called 'connection' which has a reference to the corresponding entry from the databaseConnections configuration option.

Exception Handling

An exception is is thrown if the database connection name is not valid.

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Examples

pjs.query("select * from mytable where mycol = ? or mycol = ?", [value1, value2]); // Query runs against default database connection.
pjs.query(pjs.getDB("crm"), "select * from mytable where mycol = ? or mycol = ?", [value1, value2]); // Query runs against database connection "crm".

const record = {
  id: 123,
  firstname: "Joe",
  lastname: "Customer"
};
  
pjs.data.add("customers", record); // Runs against default database connection.
pjs.data.add(pjs.getDB("crm"), "customers", record) // Runs against database connection "crm".

const connectionInfo = pjs.getDB().connection; // Default connection.
if (connectionInfo.driver === "IBMi") {
  // IBM i-specific code.
}
else if (connection.driver === "mysql") {
  // MySQL/MariaDB-specific code.
}