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XQuery op:from-sql

MarkLogic 12 EA 2 Product Documentation
op.fromSQL

op.fromSQL(
   select as String,
   [qualifier as String]
) as ModifyPlan

Summary

This function dynamically constructs a row set based on a SQL SELECT query from views.

Parameters
select A SQL SELECT query expressed as a string.
qualifier Specifies a name for qualifying the column names. Placeholder parameters in the SQL string may be bound in the result() call.

Usage Notes

The fromSQL function is one of the Data Access Functions.

Example

// List all of the employees in the 'employees' view.

const op = require('/MarkLogic/optic');

  op.fromSQL('SELECT employees.FirstName, employees.LastName FROM employees')
    .result();

Example

// Joins the row set produced by a SQL SELECT with the row set produced by a
// SPARQL SELECT and then groups, orders, and limits the result:

const op = require('/MarkLogic/optic');

const topTweeters =
  op.fromSQL('SELECT customerId, customerName FROM customers WHERE ...', 'customers')
    .joinInner(
      op.fromSPARQL('SELECT ?customerId ?tweetId WHERE { ... }', 'tweets'),
      op.on(
        op.viewCol('customers', 'customerId'),
        op.viewCol('tweets',    'customerId')
        ))
    .groupBy('customerName', op.count('tweetCount', 'tweetId'))
    .orderBy('tweetCount')
    .limit(1000)
    .map(row => {...})
    .result();

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