I have two classes: sample, and parameter. I also have a sample_sample_parameter lookup table which exists to hold the sample id and the parameter id. This is mapped in my grails app.
I was able to write an sql query that works in squirrel:
select s.* from sample s, sample_sample_parameters sp where s.id = sp.sample_id and sp.sample_parameter_id = 41
where 41 would be replaced with the parameter.id variable passed from the gsp page to the action. I have also tried to make it work with executeQuery but it tells me that sample is not mapped.
How do I turn this query into a gorm recognizable form?
class Sample {
Date collectionDate // date the sample was collected
Date sampleReceivedDate // date the sample arrived on site
Date dateCreated
String sampleComments // details about the sample
String labAccessionID // internal reference
String sampleGender // is it from a male or female?
String sampleAge // the age of the animal the sample was taken from
String sampleBreed // the breed of animal
String sampleNameID // patient name
String filepath
String enteredby
String sg
String mosm
static searchable = true
static hasMany =[sampleParameters:SampleParameter, ficsruns:Ficsrun]//[tags:Tag]// a Sample can have many parameters
/* mappedBy allows two tables share a common table. It creates two join tables, one for each.
* SampleParameter is the table being shared by Sample and SampleType tables */
static mappedBy=[sampleParameters:"samples"]//[tags:"domainClass1s"]/*http://www.van-porten.de/2010/09/multiple-many-to-many-in-grails/*/
static belongsTo = [sampleType:SampleType, labFinding:LabFinding, sampleSource:SampleSource, species:SpeciesList] // creates dependencies
static constraints = {
sampleType(blank:false)
sampleNameID(blank:false)
collectionDate(blank:false)
sampleReceivedDate(blank:false)
sampleComments(nullable:true, maxSize:1000)
labAccessionID(nullable:true)
sampleGender(blank:false, inList:["M","F","NM","SF", "UNK"])
sampleAge(nullable: true)
sampleBreed(nullable:true)
sampleSource(blank:false)
species(blank:false)
labFinding(nullable:true)
filepath(nullable:true)
enteredby(nullable:true)
sg(nullable:true)
mosm(nullable:true)
dateCreated()
}
/* This section is for static mapping to the hematology database*/
static mapping = {
version false
id generator:'sequence', params:[sequence:'SHARED_SEQ']
}
String toString(){
"${sampleNameID}"
}
}
class SampleParameter implements Comparable{
String name
String value
static hasMany = [
samples:Sample, //domainClass1s: DomainClass1,
sampleTypes:SampleType //domainClass2s: DomainClass2
]
static mapping = {
version false
id generator:'sequence', params:[sequence:'SHARED_SEQ']
}
static mappedBy = [samples:"sampleParameters",sampleTypes:"sampleParameters"]//[domainClass1s: "tags", domainClass2s: "tags"]
static belongsTo =[Sample,SampleType] //[DomainClass1, DomainClass2]
static constraints = {
name(blank:false)
//value()
//value(unique:true)
value (unique: 'name')
}
#Override public String toString() {
return name + " " + value
}
#Override
public int compareTo(Object o) {
if (o == null || this == null) {
return 0;
} else {
return value.compareTo(o.value)
}
}
}
As a first suggestion, when you have the paramter's id, do the following.
Parameter p = Parameter.get(params.id) // or wherever your id is stored
List<Sample> samples = Sample.findAllByParameter(p) // this assumes, the parameter property is actually named 'parameter'
Of course there is no error handling in place right now, but you'll get the idea.
Welcome to GORM, welcome to Grails.
The problem is that you're not using a HQL query in your executeQuery method. Instead you're using native sql. From the manual:
The executeQuery method allows the execution of arbitrary HQL queries.
Take a look at the specification to see ways of doing that. Which, by the way, are way easier than native sql.
List<Sample> samples = Sample.findAllBySampleParameter(SampleParameter.get(variable))
Give it a try?
Related
I have the following scenario (Domain classes)
class Request {
String title
List statusUpdates
static hasMany = [statusUpdates: StatusUpdate]
}
and
class StatusUpdate {
Date dateCreated
String statusFrom
String statusTo
String notes
static belongsTo = Request
}
I am currently using createCriteria to implement filtering and basic sorting of Request.
Now I want to get a list of Requests starting from the most recently updated (ordered by the value of the field dateCreated of the last StatusUpdate for the Request)
Any hint?
assuming that every Request has at least one StatusUpdate and slightly changing belongsTo declaration, you could go the other direction:
class StatusUpdate {
Date dateCreated
String statusFrom
String statusTo
String notes
static belongsTo = [req: Request] // I assume that naming the field "request" would cause whole bunch of weird problems, therefore "req"
}
StatusUpdate.createCriteria().list() {
req {
// your criteria for requests filtering
}
projections {
groupProperty 'req', 'reqAlias'
max 'dateCreated', 'maxDateCreatedAlias'
}
order 'maxDateCreatedAlias', 'desc'
}.collect { it[0] }
You can use Comparator or Comparable interface.
Here you have a nice example
link
In Grails I have these 4 domain classes:
package com.whatever.ts4
class A_class {
String aName
static hasMany = [b_class: B_class]
}
package com.whatever.ts4
class B_class {
String bName
A_class a_class
static hasMany = [c_class: C_class]
static belongsTo = [A_class]
}
package com.whatever.ts4
class C_class {
String cName
B_class b_class
static hasMany = [d_class: D_class]
static belongsTo = [B_class]
}
package com.whatever.ts4
class D_class {
Long rowNumber
String dataValue
C_class c_class
static belongsTo = [C_class]
}
Simple ER diagram:
A_class 1=>many B_class 1=>many C_class 1=>many D_class
I'm successfully populating them in BootStrap.groovy
Now,given an single A_class id, I need to obtain a set with these columns:
aName, bName, cName, rowNumber, dataValue
Can I do that using namedQueries?
I’ve tried putting this in the A_class domain class:
static namedQueries = {
myNamedQuery { aid ->
createAlias b_class,'b'
createAlias 'b.c_class','c'
createAlias 'c.d_class','d'
eq 'id',aid
}
}
I like the idea of a named query, because this result set will need to be returned for different A_class id’s. I can utilize a Service to prep the data and call it via the Controller which will render it as JSON (I digress). But, perhaps there is a Groovier way?
You don't need named query for this kind of action. You will obtain all information that you need just by taking it from A_class entity. For example:
def a_class_entity = A_class.get(id)
def b_names = a_class_entity.b_class.bName // set of all bNames
//<-- Not sure if flatten() works with spread collection fields, but it should -->
def c_names = a_class_entity.b_class.c_class.flatten().cName // collection of all cNames
def rowNumbers = a_class_entity.b_class.c_class.d_class.flatten().rowNumber // collection of all rowNumbers
def dataValues = a_class_entity.b_class.c_class.d_class.flatten().dataValue // collection of all dataValues
class Contact {
String name
String number
}
class Message {
String text
String number
Contact contactInfo //If any
}
I need to join on Message.number = Contact.number. Any thoughts on creating association in Grails/GORM with non primary key column?
I'm pretty sure this isn't possible in GORM, and I don't know if it's even possible in regular Hibernate. But you can fake it:
class Message {
String text
String number
static transients = ['contactInfo']
Contact getContactInfo() {
Contact.findByNumber(number)
}
void setContactInfo(Contact contact) {
number = contact.number
}
}
Burt, this is possible with hibernate using the property-ref attribute
Have been trying to look for an answer for hours, but have so far not managed to come up with an adequate solution, so I'm hoping someone here might have some more experience with Grails, and implementing custom relationships in it.
My problem is that I have two classes:
Company
OrderConfig
OrderConfig contains two references to Company. 1 for a consignee, 1 for a shipper. I implemented the relationship (see below), and everything looks dandy, with my order_config table containing both a consignee_company_id column and a shipper_company_id column.
However, I do not want or need a company_id column at all. I would prefer using the CompanyName as the identifying column. How can I prevent Grails from automatically adding the id column to the company table, and instead use the companyName column as the primary key, thus ensuring my order_config table will be generated containing the companyName and not the company_id?
I tried embedding the company in the orderconfig class, and wrestled with all kinds of other options including the mappings, however I ran into trouble with each and every one of them.
Thanks in advance!
My code so far:
class OrderConfig {
static hasMany = [consignee:Company, shipper:Company]
String toString() {
return "${consignee}"
}
static constraints = {
consignee (blank:false, maxSize:10)
shipper (blank:false, maxSize:10)
}
Company consignee
Company shipper
}
class Company {
String toString() {
return "${companyName}"
}
static constraints = {
companyName(blank:false, maxSize:10)
companyAddress1(blank:false, maxSize:40)
companyAddress2(blank:false, maxSize:40)
companyAddress3(blank:false, maxSize:40)
companyAddress4(blank:false, maxSize:40)
companyZipCode(blank:false, maxSize:36)
companyCountry(blank:false, maxSize:36)
}
String companyName
String companyAddress1
String companyAddress2
String companyAddress3
String companyAddress4
String companyZipCode
String companyCountry
}
You need to look at the advanced GORM config options in the documentation, in section 5.5.2.1
There is an example
class Person {
String firstName
static hasMany = [addresses:Address]
static mapping = {
table 'people'
firstName column:'First_Name'
addresses joinTable:[name:'Person_Addresses', key:'Person_Id', column:'Address_Id']
}
}
there you can see how they are specifying the key and column name on which to do the stuff.
Edit -- I reread your question: if you are asking how to change it so Company has an assigned id, you might be able to do something like this example
static mapping = {
id generator:'assigned', column:'column_name',name:'propertyName'
}
where more options are available here: http://www.grails.org/doc/1.3.x/ref/Database%20Mapping/id.html
I am having problems persisting domain objects where I have a many-to-many relationship with a join table
class A{
String name
static hasMany = [bs:B]
}
class B{
String surname
static belongsTo=A
static hasMany=[as:A]
}
A a = new A(name:'Test')
B b = new B(surname:'user')
a.addToBs(b)
a.save(flush:true)
Then what I would expect to see is the following
Table A Table AB Table B
id name a_id b_id id surname
1 Test 1 1 1 User
However, the data only persists into table A.
Does anybody know what I am doing wrong ?
thanks
I have found this link which is shows a clear way of mapping many to many relationships
http://chrisbroadfoot.id.au/2008/07/19/many-to-many-relationship-mapping-with-gorm-grails
I still havent been able to get it working the way that I want to at the moment
I tried imitating your code and cascading works for me.
Class A:
package searcher
class A {
String name
static hasMany = [bs:B]
static constraints = {
}
public String toString() {
def s = "Name: $name\n Bs: "
bs.each {
s = "$s $it "
}
return s
}
}
Class B:
package searcher
class B {
String surname
static belongsTo = A
static hasMany = [as:A]
static constraints = {
}
}
Controller Source:
package searcher
class ManyController {
def ab = {
A a = new A(name:'Test')
B b = new B(surname:'user')
a.addToBs(b)
a.save(flush:true)
render A.list()
}
}
Produces output:
[Name: Test Bs: searcher.B : 1 ]
I didn't run into the problem you did, but I did have some initial trouble that was fixed by doing a grails clean. Have you tried a variety of database configurations? I was just using an in memory hsqldb set to create-drop. If you're using a DBMS that I happen to have installed I'll try pointing it to another database and giving it a whirl.