grails动态地将gorm子查询添加到现有查询中
我希望有一个用于构建查询的util,这样我就可以为公共查询添加特定性,而不是一遍又一遍地硬编码类似的查询。 例如:grails动态地将gorm子查询添加到现有查询中,grails,groovy,gorm,detachedcriteria,Grails,Groovy,Gorm,Detachedcriteria,我希望有一个用于构建查询的util,这样我就可以为公共查询添加特定性,而不是一遍又一遍地硬编码类似的查询。 例如: DetachedCriteria query = DeviceConfiguration.where { ... } while(query.list(max: 2).size() > 1) QueryUtil.addConstraint(query, newConstraint) 但我在处理涉及多对多关系的查询时遇到了麻烦 如果我的域类是: class StringDes
DetachedCriteria query = DeviceConfiguration.where { ... }
while(query.list(max: 2).size() > 1) QueryUtil.addConstraint(query, newConstraint)
但我在处理涉及多对多关系的查询时遇到了麻烦
如果我的域类是:
class StringDescriptor {
String name
String stringValue
static hasMany = [ deviceConfigurations: DeviceConfiguration ]
static belongsTo = DeviceConfiguration
}
class DeviceConfiguration {
Integer setting1
Integer setting2
static hasMany = [ stringDescriptors: StringDescriptor ]
}
我的设备配置如下所示:
DeviceConfiguration hondaAccord = new DeviceConfiguration(setting1: 1, setting2: 1)
DeviceConfiguration hondaCivic = new DeviceConfiguration(setting1: 2, setting2: 2)
DeviceConfiguration accord = new DeviceConfiguration(setting1: 3, setting2: 3)
StringDescriptor hondaDescriptor = new StringDescriptor(name: "make", stringValue: "honda")
StringDescriptor civicDescriptor = new StringDescriptor(name: "model", stringValue: "civic")
StringDescriptor accordDescriptor = new StringDescriptor(name: "model", stringValue: "accord")
hondaAccord.addToStringDescriptors(hondaDescriptor)
hondaAccord.addToStringDescriptors(accordDescriptor)
hondaCivic.addToStringDescriptors(hondaDescriptor)
hondaCivic.addToStringDescriptors(civicDescriptor)
accord.addToStringDescriptors(accordDescriptor)
hondaAccord.save(failOnError: true)
hondaCivic.save(failOnError: true)
accord.save(failOnError: true, flush: true)
//Lists hondaAccord and hondaCivic
DeviceConfiguration.byStringDescriptor("make", "honda").list()
//Lists hondaAccord and accord
DeviceConfiguration.byStringDescriptor("model", "accord").list()
// LISTS NOTHING... BUT WHYYYYY?
DeviceConfiguration.byStringDescriptor("make", "honda").byStringDescriptor("model", "accord").list()
我希望能够做到这一点:
def query = DeviceCollector.where{ stringDescriptors {name =~ "make" & stringValue =~ "honda"} }
if(query.list(max: 2)?.size() > 1)
def query2 = query.where { stringDescriptors {name =~ "model" & stringValue =~ "civic"} }
if(query2.list(max: 2)?.size() > 1)
//...
但这不起作用-query2给出与第一个查询相同的结果。但当我这么做的时候,它工作得非常完美:
def query = DeviceCollector.where{ stringDescriptors {name =~ "make" & stringValue =~ "honda"} }
if(query.list(max: 2)?.size() > 1)
def query2 = query.where { eq('setting1', 1) }
if(query.list(max: 2)?.size() > 1)
def query3 = query.build { eq('setting2', 1) }
请告知:(
编辑感谢injecteer
现在我的域名包括:
class DeviceConfiguration {
//...
static namedQueries = {
byStringDescriptor { String name, String value ->
stringDescriptors {
ilike 'name', name
ilike 'stringValue', value
}
}
}
}
我尝试将查询串在一起,如下所示:
DeviceConfiguration hondaAccord = new DeviceConfiguration(setting1: 1, setting2: 1)
DeviceConfiguration hondaCivic = new DeviceConfiguration(setting1: 2, setting2: 2)
DeviceConfiguration accord = new DeviceConfiguration(setting1: 3, setting2: 3)
StringDescriptor hondaDescriptor = new StringDescriptor(name: "make", stringValue: "honda")
StringDescriptor civicDescriptor = new StringDescriptor(name: "model", stringValue: "civic")
StringDescriptor accordDescriptor = new StringDescriptor(name: "model", stringValue: "accord")
hondaAccord.addToStringDescriptors(hondaDescriptor)
hondaAccord.addToStringDescriptors(accordDescriptor)
hondaCivic.addToStringDescriptors(hondaDescriptor)
hondaCivic.addToStringDescriptors(civicDescriptor)
accord.addToStringDescriptors(accordDescriptor)
hondaAccord.save(failOnError: true)
hondaCivic.save(failOnError: true)
accord.save(failOnError: true, flush: true)
//Lists hondaAccord and hondaCivic
DeviceConfiguration.byStringDescriptor("make", "honda").list()
//Lists hondaAccord and accord
DeviceConfiguration.byStringDescriptor("model", "accord").list()
// LISTS NOTHING... BUT WHYYYYY?
DeviceConfiguration.byStringDescriptor("make", "honda").byStringDescriptor("model", "accord").list()
我很困惑,又一次
由于injecteer的更新答案而进行编辑
耶,这是为我工作的命名查询:
class DeviceConfiguration {
//...
static namedQueries = {
byStringDescriptor { List<StringDescriptor> descriptors ->
sizeEq('stringDescriptors', descriptors.size())
stringDescriptors {
or {
for(descriptor in descriptors) {
and {
ilike 'name', descriptor.name
ilike 'stringValue', descriptor.stringValue
}
}
}
}
}
}
}
injecteer是我最喜欢的人。使用
条件查询
或命名查询
。它们都允许更好的链接
class DeviceConfiguration {
static namedQueries = {
byDescriptors { List vals ->
stringDescriptors {
or{
for( def tuple in vals ){
and{
ilike 'name', "%${tuple[ 0 ]}%"
ilike 'stringValue', "%${tuple[ 1 ]}%"
}
}
}
}
}
}
}
所以你可以打电话:
DeviceConfiguration.byDescriptors( [ [ 'make', 'honda' ], [ 'model', 'accord' ] ] ).findAllBySetting1( 10 )
你应该知道什么连词是合适的和或或
更新2
有这么多的和你什么都找不到
如果您启动一个类似blah(honda,accord).list()
的查询,它将尝试查找带有name='honda'和name='accord'
的StringDescriptor,这是不可能的,因此它不会返回任何结果
这就是为什么我倾向于认为,您的域模型根本不允许这样的查询——即使是在SQL级别
您的属性应清晰可辨,以便您可以通过本田(型号“make”)和雅阁(型号“model”)找到,它不应在“model”中查找“honda”
单个设备配置
实例是否可以包含多个相同类型的StringDescriptor
?谢谢!这对我来说绝对是正确的一步。但是我很难将我的用例的查询串在一起…我已经根据您的答案用我尝试过的方法更新了我的问题…有任何问题吗建议?非常感谢您迄今为止的帮助!很高兴知道您可以在命名查询中使用循环。但我似乎仍然无法获得我想要的行为。我已经用我尝试过的方法更新了我的问题…如果您还有其他建议,我将非常感谢:(在我的领域中,我将添加一个约束,防止任何单个设备配置指向同名的StringDescriptor…(例如,任何配置都不会指向[名称:
make,值:honda]
和[名称:
make,值:toyota]
)…所以我要做的是只查询引用了两个特定描述符的设备配置-[name:make,value:honda]
和[name:model,value:accord]
…啊,哦,我是个白痴。我现在明白了,谢谢你的帮助!我会更新我所做的,但基本上与你的答案相同。