olap4j Specification
Because olap4j drivers need to interoperate with OLE DB for OLAP and XMLA systems, Datatype values have the same ordinals as in the OLE DB specification, and we show here the name and description of the corresponding type in the OLE DB specification. Supporting Actions Axis Operations getSet setSet addToAxis removeFromAxis Set Operations getTuple setTuple addToSet - includes Tuples, ranges of Tuples, functions, properties removeFromSet Tuple Operations addMember deleteMember getMembers Open Issues Is this API at the right level, or is it too close to MDX? Do we want to include support for adding highlighting conditions? What about result formatting as part of the query? Should common operators such as CrossJoin(), Order() and Filter() be baked into the API as methods, or just treated as functions? How should we handle functions that return or modify Sets? We want to make it easy to wrap an entire axis in a function
5 Defining SQL Queries Using View Objects
For more information, see Section 5.1.2, "Additional Functionality for View Objects." You will need to complete these tasks: Create the view object with declarative SQL mode enabled, as described in Section 5.7.1, "How to Create Declarative SQL View Objects." Create a view criteria to filter the results from table joins, as described in Section 5.9.1, "How to Create Named View Criteria Declaratively." You will use the Edit View Criteria dialog to create the named view criteria by selecting one or more attributes from the joined entity objects. When the user interface designer creates the page in JDeveloper using the Data Controls panel, JDeveloper automatically inserts the list component identified by the Default List Type selection you made for the view object's LOV-enabled attribute in the List UI Hint dialog
HIBERNATE - Relational Persistence for Idiomatic Java
How did we create a link between a Person and an Event in the unidirectional example? You add an instance of Event to the collection of event references, of an instance of Person. Outer join fetching allows a whole graph of objects connected by many-to-one, one-to-many, many-to-many and one-to-one associations to be retrieved in a single SQL SELECT
sql - Fetch the row which has the Max value for a column - Stack Overflow
It should look something like this: SELECT DISTINCT UserId , MaxValue FROM ( SELECT UserId , FIRST (Value) Over ( PARTITION BY UserId ORDER BY Date DESC ) MaxValue FROM SomeTable ) I suspect that you can get rid of the outer query and put distinct on the inner, but I'm not sure. There is instead a predicate placed on the result of the inline view that contains the analytic function -- a very different matter, and completely standard practice
In this model, a request from the client is send to the server (where the JPA persistence layer runs), a new EntityManager is opened, and all database operations are executed in this unit of work. Usually this is not a problem, because exceptions are not recoverable and you have to start over your unit of work after rollback anyway.The persistence context caches every object that is in managed state (watched and checked for dirty state by Hibernate)
Using SQL to Access Data Services
Setting Table Parameters Using JDBC Table parameters are passed to data services through the AquaLogic Data Services Platform JDBC driver, specifically through its TableParameter class. Using Custom Database Functions through AquaLogic Data Services Platform Built-in or custom functions in your database can be made available through data services once the function has been registered with AquaLogic Data Services Platform through a library
JasperReports 6.1.0 - Jasper Sample
In JasperReports there are two ways to accomplish this: If a report query is declared, it could be customized to retrieve already aggregated data from the data source (A SQL query could use the GROUP BY clause and statistical functions, for example). In order to get an accurate data representation, the data in the data source should be already ordered according to the group expressions used in the report
java - PreparedStatement IN clause alternatives? - Stack Overflow
This technique has the added advantage of potentially better query plans from the optimizer (check a page for multiple values, tablescan only once instead once per value, etc) may save on overhead if your database doesn't cache prepared statements. You can use a combination of special characters and alphabets instead of the word "PARAM" in order to make sure that there is no possibility of such a word coming in the query
Pentaho Analysis Services: How to Design a Mondrian Schema
Each of Mondrian's extensions is technically a Service Provider Interface (SPI); in short, a Java interface which you write code to implement, and which Mondrian will call at runtime. The access attribute can be "all", meaning all members are visible; "none", meaning the hierarchy's very existence is hidden from the user; and "custom"
Natural join: somehow support this: select a.x, b.x, x from dual a natural join dual b Use the Java service provider mechanism to register file systems and function libraries. Support UDT (user defined types) similar to how Apache Derby supports it: check constraint, allow to use it in Java functions as parameters (return values already seem to work)
Hive Quick Guide
Meta Store Hive chooses respective database servers to store the schema or Metadata of tables, databases, columns in a table, their data types, and HDFS mapping. All the data types in Hive are classified into four types, given as follows: Column Types Literals Null Values Complex Types Column Types Column type are used as column data types of Hive
Pentaho Mondrian Documentation
Each of Mondrian's extensions is technically a Service Provider Interface (SPI); in short, a Java interface which you write code to implement, and which Mondrian will call at runtime. Every schema object (schema, cube, virtual cube, dimension, hierarchy, level, measure, named set) has a caption attribute, and user interfaces such as JPivot and Pentaho Analyzer display the caption rather than the real name
FOR EACH ROW triggers are called once for each inserted, updated, or deleted row.QUEUE is implemented for syntax compatibility with HSQL and has no effect.The trigger need to be created in the same schema as the table. Currently, enabling this is experimental only.This is a global setting, which means it is not possible to open multiple databases with different modes at the same time in the same virtual machine
Examples below: SELECT COUNT(DISTINCT firstname, lastname) FROM customer SELECT COUNT(DISTINCT (firstname, lastname)) FROM customer The EVERY, ANY and SOME operations can be performed on boolean expressions only. -- default collation collation for the database is ASCII SELECT id, lastname FROM customer ORDER BY lastname ID LASTNAME -- -------- 40 Clancy 36 King 35 White 6 king -- a language collation is used, it treats king and King as adjacent entries SELECT id, lastname FROM customer ORDER BY lastname COLLATE "English" ID LASTNAME -- -------- 40 Clancy 6 king 36 King 35 White In the above example, if the LASTNAME column is itself defined in the table definition with COLLATE "English", then the COLLATE clause is not necessary in the ORDER BY expression
The third and fourth argument values can have any type and are initially null, but they can be updated in the body of the function during each invocation. Among general conditions that can be specified, SQLEXCEPTION covers all exceptions, SQLWARNING covers all warnings, while NOT FOUND covers the not-found condition, which is raised when a DELETE, UPDATE, INSERT or MERGE statement completes without actually affecting any row
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