hql

问题 I have a bi-directional one-to-many relationship defined between Parent and Child classes. I'm looking to execute a query such that I can return a single parent, and a subset of its children in a bean. public class Parent { private int id; private Set<Child> children = new HashSet<Child>(0); // other fields + getters and setters } public class Child { private Parent parent; private int age; // other fields + getters and setters } The output I'm looking to achieve is: public class

问题 Hope someone can help me with this HQL query. I'm using: Query query = session.createQuery(sql); where the sql is: select distinct c.id from EstateConsumer as c where c.clientId = ? and (c.vehicleReg1 or c.vehicleReg2) like ? but is getting the following exception: org.hibernate.hql.ast.QuerySyntaxException: unexpected AST node: or near line 1, column 121 So how can you use the "OR" syntax by using one "like"? The following however works: select distinct c.id from EstateConsumer as c where c

问题 I have a Hive (ver 0.11.0) table partitioned by column date, of type string. I want to know if there exists a way in Hive by which I can drop partitions for a range of dates (say from 'date1' to 'date2'). I have tried the following (SQL type) queries, but they don't seem to be syntactically correct: ALTER TABLE myTable DROP IF EXISTS PARTITION (date>='date1' and date<='date2'); ALTER TABLE myTable DROP IF EXISTS PARTITION (date>='date1' && date<='date2'); ALTER TABLE myTable DROP IF EXISTS

问题 Does anyone know if HQL has a keyword to identify rows such as ROWID or ROWNUM? I would like to implement pagination with HQL but I am not able to use .setMaxResult() or .setFirstResult() because I don't work with the session object directly and therefore don't use the Query object but simply create my query as a string and use the .find() method. I tried using LIMIT and OFFSET in my query, but HQL seems to be ignoring these keywords and is returning the whole result to me no matter what. I'm

问题 Does anyone know if HQL has a keyword to identify rows such as ROWID or ROWNUM? I would like to implement pagination with HQL but I am not able to use .setMaxResult() or .setFirstResult() because I don't work with the session object directly and therefore don't use the Query object but simply create my query as a string and use the .find() method. I tried using LIMIT and OFFSET in my query, but HQL seems to be ignoring these keywords and is returning the whole result to me no matter what. I'm

问题 I would like to use the yearweek() function of QueryDSL, which is supported by QueryDSL. This function generates the query select year(table1.timestamp)*100 + week(table1.timestamp) as col_0_0_ [...] . This does, however, not return a correct result on year endings. I've already opened a bug report for this issue. I would rather use the built-in SQL yearweek() function, which is directly supported by e.g. MariaDB. Is there a way of using the SQL function YEARWEEK(timestamp) with QueryDSL? Or

问题 Executing JPQL using hibernate 4.2.5: select c from Chargeback as cc join cc.customer as c group by c order by max(cc.created) Usecase: show customers with the latest chargbacks. produces org.hibernate.exception.SQLGrammarException: could not extract ResultSet When using select c.id from Chargeback as cc join cc.customer as c group by c order by max(cc.created) it will work. When using select c from Chargeback as cc join cc.customer as c group by c.id, c......all columns order by max(cc

问题 guy, I have a very strange problem. I am setting up some endpoints in my application and I have an endpoints like this: @Path("/ioconfiguration") public class IOConfigurationEndPoint { @EJB private static IOConfigurationDAO ioConfigurationDAO; @GET @Produces(MediaType.APPLICATION_JSON) public Response getAllIoConfigurations() { ioConfigurationDAO = new IOConfigurationDAO(); ioConfigurationDAO.init(); List<IOConfiguration> list = ioConfigurationDAO.findAllIOConfiguration(); ioConfigurationDAO

问题 How can i write to HQL Query? This is My Original scenario I have two hbm files ADVMAgencyMaster.hbm.xml,ADVRoheader.hbm.xml corresponding pojo classes are ADVMAgencyMaster.java,ADVroheader.java. <hibernate-mapping> <class name="com.adv.hibernatebean.ADVMAgencyMaster" table="ADVMAGENCYMASTER" catalog="MEDIAERP"> <id name="mamaid" type="java.lang.String"> <column name="MAMAID" length="10" /> <generator class="assigned"></generator> </id> <property name="mamaname" type="java.lang.String">

问题 I have a small trouble into Hive, when I try to concatenate map Assume that I've something like that : var 1 | var 2 x | map(key1:value1) x | map(key2:value2) x | map(key3:value3) y | map(key4:value4) What I'am trying to get, It's something like that var 1 | var 2 x | map(key1:value1 ; key2:value2; key3:value3) y | map(key4,value4) Something like a map concatenation. How can I proceed whith Hive ? 回答1: Use this Query... select var1,collect_set(CONCAT_WS(',',map_keys(var2),map_values(var2)))