SQream Scripting

The Java- based SQreamDB scripting enhances your interaction with SQL by providing conventions which allow dynamic generation, management, and automation of SQL code and database operations.

Syntax

-- Double curly brackets

{{ ... }}

-- Parallel:

@@ Parallel $$ ... $$

-- Declare:

@@ Declare '<my_parameter>' = <value>

-- SetResults:

@@ SetResults <result_variable>

-- SplitQueryByDateTime

@@ SplitQueryByDateTime instances = <value>, from = <value>, to = <value>

-- SplitQueryByDate

@@ SplitQueryByDate instances = <value>, from = <value>, to = <value>

-- SplitQueryByNumber

@@ SplitQueryByNumber instances = <value>, from = <value>, to = <value>

-- ${ ... }

Parameter

Description

{{ … }}

Double brackets can contain JavaScript code to be executed through the Editor

Parallel

Runs specified queries in parallel

Declare

Declares a variable value

SetResults

Saves specified query results as a variable

SplitQueryByDateTime

Splits query execution by a predefined number of instances and by specific DATETIME column values

SplitQueryByDate

Splits query execution by a predefined number of instances and by specific DATE column values

SplitQueryByNumber

Splits query execution by a predefined number of instances and by specific NUMERIC column values

Usage Notes

Execution

Metalanguage scripting is available only through the SQreamDB web interface and cannot be used via the CLI.

Examples

Double Curly Brackets

{{
  return 1;
}}

Parallel

@@ Parallel
$$
SELECT * FROM my_table;
SELECT * FROM our_table;
SELECT * FROM that_table;
$$;

Declare

@@ Declare myVar = 3;
SELECT '${myVar}';

SetResults

@@ SetResults tableAverage
SELECT AVG(col1) AS avg_salary FROM my_table;

SELECT col1 FROM my_table WHERE col1 > ${tableAverage[0].avg_salary};

SplitQueryByDateTime

@@ SplitQueryByDateTime instances = 4, from = '2021-01-01 00:00:00', to = '2022-01-01 00:00:00'
SELECT ${from}, ${to};

SplitQueryByDate

@@ SplitQueryByDateTime instances = 4, from = '2021-01-01', to = '2022-01-01'
SELECT ${from}, ${to};

SplitQueryByNumber

@@ SplitQueryByDateTime instances = 4, from = 0, to = 100
SELECT ${from}, ${to};