User Tools

Site Tools

A PCRE internal error occured. This might be caused by a faulty plugin


**HPL/SQL is included to Apache Hive since version 2.0** * [[home|Home]]\\ * [[why|Why HPL/SQL]]\\ * [[features|Key Features]]\\ * [[start|Get Started]]\\ * [[doc|HPL/SQL Reference]]\\ * [[download|Download]]\\ * [[new|What's New]]\\ * [[about|About]]


====== MAP OBJECT Statement - PL/HQL Reference ====== MAP OBJECT statement allows you to map an object (table or view) to a connection profile. You can also use this statement to map an object name used in a PL/HQL script to the actual object name in the database. Depending on the connection profile linked to the object, PL/HQL can work with multiple databases to access different objects in a single PL/HQL script. For example, you can send queries to Hive and use a RDBMS or NoSQL database for logging. **Syntax**: <code language=sql> MAP OBJECT source_name [TO target_name] [AT connection_profile]; </code> Notes: * //source_name// - the object name used in PL/HQL scripts * //target_name// - the object name that actually used when accessing the database * //connection_profile// - the connection profile used to access this object. If the profile is not specified the //default// profile is used. * At least //target_name// or //connection_profile// must be specified * //source_name, target_name// and //connection_profile// are expressions, so you can define them dynamically. **Example**: Query Hive and write log messages to a MySQL database: <code language=sql> MAP OBJECT log TO log.log_data AT mysqlconn; DECLARE cnt INT; SELECT count(*) INTO cnt FROM sales.users WHERE local_dt = CURRENT_DATE; INSERT INTO log (message) VALUES ('Number of users: ' || cnt); </code> **Compatibility:** PL/HQL extension **Version**: PL/HQL 0.3.1