[
https://issues.apache.org/jira/browse/GROOVY-9159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Daniel Sun updated GROOVY-9159:
-------------------------------
Description:
_{color:#d04437}(Note: The exact syntax might be altered before introduction,
currently working on the general principle){color}_
GINQ will reuse most of standard SQL syntax, which can make the learning curve
smooth and avoid infringing the patent of Microsoft.
All GINQ related keywords are uppercase to avoid breaking existing source code
as possible as we can, e.g. {{FROM}}, {{WHERE}}, {{SELECT}}, etc.
h2. EBNF
h3. TBD
h2. Examples
h3. 1. Filtering
{code:java}
@groovy.transform.EqualsAndHashCode
class Person {
String name
int age
}
def persons = [new Person(name: 'Daniel', age: 35), new Person(name: 'Peter',
age: 10), new Person(name: 'Alice', age: 22)]
def result =
FROM persons p // p is an alias
WHERE p.age > 15 AND p.age <= 35
SELECT p.name
assert ['Daniel', 'Alice'] == result
result =
FROM persons p // p is an alias
WHERE p.age > 15 AND p.age <= 35
SELECT p
assert [new Person(name: 'Daniel', age: 35), new Person(name: 'Alice', age:
22)] == result
{code}
{code:java}
def numbers = [1, 2, 3]
def result =
FROM numbers t // t is an alias
WHERE t.VALUE <= 2 // VALUE is a virtual property
SELECT t.VALUE
assert [1, 2] == result
{code}
h3. 2. Joining
{code:java}
@groovy.transform.EqualsAndHashCode
class Person {
String name
int age
City city
}
@groovy.transform.EqualsAndHashCode
class City {
String name
}
def persons = [new Person(name: 'Daniel', age: 35, city: new City('Shanghai')),
new Person(name: 'Peter', age: 10, city: new City('Beijing')), new Person(name:
'Alice', age: 22, city: new City('Hangzhou'))]
def cities = [new City('Shanghai'), new City('Beijing')]
def result =
FROM persons p, cities c
WHERE p.city = c.VALUE
SELECT p.name
assert ['Daniel', 'Peter'] == result
result =
FROM persons p, cities c
WHERE p.city.name = c.name
SELECT p.name
assert ['Daniel', 'Peter'] == result
{code}
was:
_{color:#d04437}(Note: The exact syntax might be altered before introduction,
currently working on the general principle){color}_
GINQ will reuse most of standard SQL syntax, which can make the learning curve
smooth and avoid infringing the patent of Microsoft.
All GINQ related keywords are uppercase to avoid breaking existing source code
as possible as we can, e.g. {{FROM}}, {{WHERE}}, {{SELECT}}, etc.
*EBNF*
TBD
*Examples*
1. Filtering
{code:java}
@groovy.transform.EqualsAndHashCode
class Person {
String name
int age
}
def persons = [new Person(name: 'Daniel', age: 35), new Person(name: 'Peter',
age: 10), new Person(name: 'Alice', age: 22)]
def result =
FROM persons p // p is an alias
WHERE p.age > 15 AND p.age <= 35
SELECT p.name
assert ['Daniel', 'Alice'] == result
result =
FROM persons p // p is an alias
WHERE p.age > 15 AND p.age <= 35
SELECT p
assert [new Person(name: 'Daniel', age: 35), new Person(name: 'Alice', age:
22)] == result
{code}
{code:java}
def numbers = [1, 2, 3]
def result =
FROM numbers t // t is an alias
WHERE t.VALUE <= 2 // VALUE is a virtual property
SELECT t.VALUE
assert [1, 2] == result
{code}
> [GEP] Support LINQ, aka GINQ
> ----------------------------
>
> Key: GROOVY-9159
> URL: https://issues.apache.org/jira/browse/GROOVY-9159
> Project: Groovy
> Issue Type: New Feature
> Reporter: Daniel Sun
> Priority: Major
> Fix For: 4.x
>
>
> _{color:#d04437}(Note: The exact syntax might be altered before introduction,
> currently working on the general principle){color}_
> GINQ will reuse most of standard SQL syntax, which can make the learning
> curve smooth and avoid infringing the patent of Microsoft.
> All GINQ related keywords are uppercase to avoid breaking existing source
> code as possible as we can, e.g. {{FROM}}, {{WHERE}}, {{SELECT}}, etc.
> h2. EBNF
> h3. TBD
> h2. Examples
> h3. 1. Filtering
> {code:java}
> @groovy.transform.EqualsAndHashCode
> class Person {
> String name
> int age
> }
> def persons = [new Person(name: 'Daniel', age: 35), new Person(name: 'Peter',
> age: 10), new Person(name: 'Alice', age: 22)]
> def result =
> FROM persons p // p is an alias
> WHERE p.age > 15 AND p.age <= 35
> SELECT p.name
> assert ['Daniel', 'Alice'] == result
> result =
> FROM persons p // p is an alias
> WHERE p.age > 15 AND p.age <= 35
> SELECT p
> assert [new Person(name: 'Daniel', age: 35), new Person(name: 'Alice', age:
> 22)] == result
> {code}
> {code:java}
> def numbers = [1, 2, 3]
> def result =
> FROM numbers t // t is an alias
> WHERE t.VALUE <= 2 // VALUE is a virtual property
> SELECT t.VALUE
> assert [1, 2] == result
> {code}
> h3. 2. Joining
> {code:java}
> @groovy.transform.EqualsAndHashCode
> class Person {
> String name
> int age
> City city
> }
> @groovy.transform.EqualsAndHashCode
> class City {
> String name
> }
> def persons = [new Person(name: 'Daniel', age: 35, city: new
> City('Shanghai')), new Person(name: 'Peter', age: 10, city: new
> City('Beijing')), new Person(name: 'Alice', age: 22, city: new
> City('Hangzhou'))]
> def cities = [new City('Shanghai'), new City('Beijing')]
> def result =
> FROM persons p, cities c
> WHERE p.city = c.VALUE
> SELECT p.name
> assert ['Daniel', 'Peter'] == result
> result =
> FROM persons p, cities c
> WHERE p.city.name = c.name
> SELECT p.name
> assert ['Daniel', 'Peter'] == result
> {code}
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