Managing Hive databases

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Managing databases

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Managing Hive databases

Overview

How to handle a database with Hive in programming?

See also

Managing Hive databases

Available only with these kinds of connection

Overview

Hive is a software layer of Hadoop used to run queries.
Hive is using the HiveQL language that is close to SQL.
The developer specifies his query by using HiveQL (syntax derived from SQL) and the Hive engine translates this query to interrogate the HBase database in native mode..
In version 21, you have the ability to run HiveQL queries by using the SQL functions of WLanguage.

How to handle a database with Hive in programming?

To handle a database with Hive, you must use the SQL functions of WLanguage.
You can:

Connect to the database (SQLConnect or SQLConnectWS).
Retrieve data (SQLExec). See the HiveQL documentation for more details.
Disconnect from the database (SQLDisconnect).Example:

ConnectionNum is int
ConnectionNum = SQLConnect("master2.hadoop1.myserver.com", "sa", "", "default", "HIVE")
IF ConnectionNum <> 0 THEN
// The connection was successful
// Use the connection to run SQL queries
IF SQLExec("SELECT * FROM TEAM WHERE NAME='HOU'") = True THEN
// Process the query
ELSE
// Query failure: display an error message
SQLInfo("FINDCUSTOMERBYNAME")
Error("Error" + SQL.Error + "in the query: ", SQL.MesError)
END
ELSE
// The connection failed: display an error message
SQLInfo()
Error("The connection to the data source failed." + CR + ...
"Error code: " + SQL.Error + CR + SQL.MesError)
END
// In any case (connection OK or not)
SQLDisconnect()

Caution: The access to the databases in HiveQL is available at run time from Windows Vista or Windows Server 2008.