[英]Is it possible to map a table name for a domain object dynamically in grails?
I have a domain that looks something like 我有一个看起来像的域名
class Foo {
String name
static mapping = {
table 'foo'
}
}
but I want to make is more like : 但我想做的更像是:
static mapping = {
table "foo_${dynamicVarThatComesFromRequest}"
}
What I want to know is whether this is even possible? 我想知道的是这是否可能?
Thanks! 谢谢!
It is possible. 有可能的。 You can add a Hibernate interceptor to process all SQL statements and parse/replace some token in the table name you enter in the mapping with the actual table name you want to use. 您可以添加一个Hibernate拦截器来处理所有SQL语句,并解析/替换您在映射中输入的表名中的一些标记,其中包含您要使用的实际表名。
src/groovy/DynamicTableNameInterceptor.groovy : src / groovy / DynamicTableNameInterceptor.groovy:
import org.hibernate.EmptyInterceptor
public class DynamicTableNameInterceptor extends EmptyInterceptor {
public String onPrepareStatement(String sql) {
// some kind of replacement logic here
def schema=SomeHelperClass.resolveSchema()
return sql.replaceAll('_SCHEMA_', schema)
}
}
grails-app/conf/spring/resources.groovy: 的grails-app / CONF /弹簧/ resources.groovy:
beans = {
// This is for Grails 1.3.x , in previous versions, the bean name is eventTriggeringInterceptor
entityInterceptor(DynamicTableNameInterceptor)
}
I don't think that's possible. 我不认为这是可能的。 Upon application startup, the mapping
closure is evaluated and Hibernate mapping are generated as a result. 应用程序启动时,将评估mapping
闭包,并生成Hibernate映射。 This happens once upon startup, so dynamic resolution will not occur. 这在启动时发生一次 ,因此不会发生动态分辨率。
Something comparable is done in the multi-tenant-core plugin, using the 'single tenant' setup, you have a seperate database for each tenant. 在多租户核心插件中进行了类似的操作,使用“单租户”设置,每个租户都有一个单独的数据库。
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