Language integrated queries specify the logic in SQL-like syntax to process the data/events, and they are easy to write and understand due to the simple syntax. In this article, we will discuss the query language support in Ballerina with some examples.
Data processing is one of the critical components of enterprise integration. Even though there are various approaches to process data, query expressions are usually considered the go-to approach. Language integrated queries specify the logic in SQL-like syntax to process the data/events, and they are easy to write and understand due to the simplicity of the syntax. The Ballerina programming language provides first-class support to write queries for data processing. In this article, we will discuss the query language support in Ballerina with some examples.
As of now, language integrated queries are supported for iterator implementations such as an array, map, stream, and table. There are two kinds of integrated queries that can be written in Ballerina — query expression, which allows generating a list, table, string or XML; stream and query action, which executes a set of statements for each element of the iterator.
Query expressions contain a set of clauses similar to SQL to process the data. Query expressions must start with the
from clause and can perform various operations such as filter, join, sort, limit, and projection. There are various SQL like clauses to perform these operations.
fromclause - Defines an input source/iterator
_where_clause - Defines a filtering condition
_let_clause - Defines a variable that could be used in the subsequent clauses
_join_clause - Defines an input source/iterator for joining purposes. It performs an inner or left outer equijoin.
_order by_clause - Defines the sorting logic
_limit_clause - Limits the number of elements passed to the next clause
_select_clause - Performs the projection. Outputs a list, table, string, XML, or stream.
_on conflict_clause - Allows only for a query expression that constructs a table with a key sequence to avoid duplicates
SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.
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