can jpa return results as a map?
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10 Answers. There is no standard way to get JPA to return a map. ... The time to iterate a list/map in memory is going to be small relative to the time to execute/return the query results.
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LINQ works great in most cases, but when you want to build complex queries (e.g. in reporting apps) it's statically-typed nature becomes a disadvantage. It's hard to, for instance, conditionally JOIN, or conditionally GROUP BY, because the result type changes, even if in the end you want to project the same fields.
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The main difference between map() and grep() is: map() you need to loop over each element in an array and modify its value whilst the $. Grep() method returns the filtered array using some filter condition from an existing array. ... Grep() helps you to get a filter array.
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['First, execute a query get its result set.', 'Second, from the result panel, click “export recordset to an external file”. The result set is also known as a recordset.', 'Third, a new dialog displays. It asks you for a filename and file format.']
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Generally, use an output parameter for anything that needs to be returned. When you want to return only one item with only an integer data type then it is better to use a return value. Generally, the return value is only to inform success or failure of the Stored Procedure.
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The following are some of the reasons why HQL is preferred over SQL: Provides full support for relational operations. It is possible to represent SQL Queries in the form of objects in HQL which uses classes and properties instead of tables and columns. Return results as objects.
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['Prepare the callable statement by using Connection. prepareCall() . ... ', 'Register the output parameters (if any exist) ... ', 'Set the input parameters (if any exist) ... ', 'Execute the CallableStatement , and retrieve any result sets or output parameters.']
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Hence there can only be one null key in one hashmap object. If you pass null as map key, it will go to 0 bucket . All values of null key will go there. That is why it returns same value, cause all keys you are providing are null and are in the same bucket of your HashMap.
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The Jackson Object mapper can parse JSON into objects of classes developed by you, or into objects of the built-in JSON tree model explained later in this tutorial. By the way, the reason it is called ObjectMapper is because it maps JSON into Java Objects (deserialization), or Java Objects into JSON (serialization).
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['Run SELECT query on custom object.', 'export the data to csv file.', 'Automate / schedule step-1 and step-2 .']
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['concatMap could be used as a conservative choice;', 'mergeMap should not be used — the ordering of the results is important;', 'switchMap could be used — when a new search is made, pending results are no longer needed; and.']
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['forEach() method in Iterable interface.', 'default and static methods in Interfaces.', 'Functional Interfaces and Lambda Expressions.', 'Java Stream API for Bulk Data Operations on Collections.', 'Java Time API.', 'Collection API improvements.', 'Concurrency API improvements.', 'Java IO improvements.']
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Hibernate Query Language (HQL) is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database.
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HQL helps in writing database independent queries that are converted into the native SQL syntax of the database at runtime. This approach helps to use the additional features that the native SQL query provides.
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Jaql is a loosely typed functional language, with lazy evaluation. Type is usually inferred by how a value is provided. Many types have a function of the same name to force conversions of a value or variable (e.g. string() , double() ).
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['Import JDBC packages.', 'Load and register the JDBC driver.', 'Open a connection to the database.', 'Create a statement object to perform a query.', 'Execute the statement object and return a query resultset.']
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In SOQL, you specify each field name to return. Beyond that, the SELECT statement that SOQL provides is similar to SQL. You'll find writing SOQL queries pretty easy. But here's what you need to know: Although SQL and SOQL are similar, they're not the same.