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Convert to Database Type: This is the type of database to convert the table(s) to; Execute on Connection: If you would like the conversion to take effect immediately on an existing connection, select this option. Generate SQL Script File: Select this option to have all DDL and SQL generated by the conversion tool to be saved to a file.
In this tutorial, you will learn how to run an SQL query in your project which uses Spring Data JPA Query Methods. You will learn how to annotate Spring Data JPA Query method so that you can use it to perform a custom SQL query to SELECT, UPDATE or DELETE a record from a database.
To learn how to write a Native SQL Query with Spring Data JPA read this tutorial: Spring Data JPA Native SQL Query.
JPQL Query
I will begin with an example that uses JPQL to run an SQL query to select all users who have verified their email address. So my SQL query will look like this:
we could also write this query this way:
IMPORTANT:
In the above query:
UserEntity – is the name of the Entity class which you can find below in this tutorial. When we create SQL queries with JPQL, we query not the database table by its name but by an Entity class name. This is a very important difference between JPQL SQL Queries and the Native SQL queries. When creating a Native SQL query we would use a database name in the query but in the JPQL, we need to use an Entity class name and not the database table name.
emailVerificationStatus – is the name of the UserEntity class property. If you look at the code of the below UserEntity class, you will see that it has an emailVerificationStatus property name of a String data type.
Since the entity class name is UserEntity my SQL query looks like the one above.
Below is the UserEntity @Entity class:
User Entity Class
once again, because this entity class is called UserEntity and because we use JPQL and not Native Queries to select all records from a database table of type UserEntity we will need to write our SQL query this way:
JPA Repository Interface
Because I am selecting all records from a database table and because there might be thousands of them, I am going to use Paginations and thus my initial JPA Repository will look like this:
the main difference between the regular CRUDRepositoty and the one I used above is that in the above repository I make my interface extend the PagingAndSortingRepository. If you do not need to support pagination, then you can use a regular CRUDRepository and JPQL will work.
JPQL Query to Select a Single Entity
Let’s first have a look at a very simple JPQL Query which selects only one record from our database which matches the value of user id we pass in as a named parameter.
A bit later in this tutorial, you will also find an example that selects all records from a database table with support for pagination.
Remember that when writing JPQL queries we use Entity name and Entity class fields instead of a database table name and table column names.
as you can see in the query, I am referencing a UserEntity rather than users database table name and I also give a UserEntity an alias u which is then needed to be used in all other parts of a query.
and here is a unit test to test this query.
JPQL SELECT Query with Pagination
Let’s add a Query method to select all users and add support for a pagination.
To perform JPQL SQL query I will need to:
- Annotate my Spring Data JPA Query Method with a @Query annotation,
- In the SQL query itself, I need to SELECT FROM <Entity Class Name>,
- In the WHERE clause, I need to use <Entity Class Property Field Name>. Have a look at the above UserEntity class. It has a property field called “emailVerificationStatus” of a String data type.
- The countQuery inside of @Query annotation is used only because the above example uses Pagination. For use cases that do not need to use Pageable request and Pagination, no need to provide the countQuery.
And this is it. To test the above code you can use the below JUnit test case:
Run JUnit Test Case to See How It Works
I hope this tutorial was helpful to you. To learn more about building RESTful Web Services that use Spring Data JPA please check my other tutorials following this link: RESTful Web Services with Spring MVC
And if you are interested in video lessons that teach Spring Data JPA and JPQL have a look at the below list of video courses:
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Published 22 November 2018
Use the SQL Backup File Converter (available as a command line application, or as a GUI application) to convert SQL Backup files (.sqb) to Microsoft Tape Format (MTF) files (.bak). You can use the native SQL Server RESTORE command to restore MTF files.
You can also use the SQL Backup File Converter to convert SQL Backup v6 or greater files to SQL Backup v5 files; both file types have extension .sqb.
You can distribute the SQL Backup File Converter as required; you do not need to install SQL Backup in order to use it.
Using the SQL Backup file conversion utility (command line)
The executable for the SQL Backup conversion command-line utility is SQBConverter.exe. It is located in the SQL Backup installation folder (by default, %ProgramFiles%Red GateSQL Backup 10 on 32-bit machines and %ProgramFiles(x86)%Red GateSQL Backup 10 on 64-bit machines).
To convert a split backup to MTF format, use SQBConverter.exe to convert each of the backup files in turn. You can then restore the MTF format files as a group of split backup files.
If the original SQL Backup file (.sqb) was created with multiple threads (THREADCOUNT > 1), SQBConverter.exe will generate a Microsoft Tape Format file (.bak) for each thread.
Syntax
To convert a SQL Backup file, use a command in the following format: SQBConverter 'inputfile' 'outputfile' 'password' /sqb
| Arguments | |
| inputfile | The file path, name and extension of the SQL Backup backup file that you want to convert. |
| outputfile | The file path, name and extension for the converted file. |
| password | The password for the SQL Backup backup file that you are converting, if the file is encrypted. |
| Switches | |
| /sqb | Convert from a SQL Backup 6 or greater compatible file to a version 5 compatible file. Note that version 5, 6, 7, 8, 9 and 10 SQL Backup files all have a .sqb extension. |
Examples
The following command converts an encrypted SQL Backup v6 or greater file to a Microsoft Tape Format file:
The following command converts a SQL Backup v6 or greater file to a SQL Backup v5 file:
Using the SQL Backup file conversion utility (graphical user interface)
Sql To Jpql Converter Tool Online
SQBConverterGUI.exe is a graphical user interface for the SQL Backup File Converter. It is located in the SQL Backup installation folder (by default, %ProgramFiles%Red GateSQL Backup 10 on 32-bit machines and %ProgramFiles(x86)%Red GateSQL Backup 10 on 64-bit machines).
Sql To Jpql Converter Tool Free
You can start the user interface from the SQL Backup graphical user interface (Tools > Utilities > SQL Backup File Converter).
To convert SQL Backup files to SQL Backup version 5 (.sqb) or Microsoft Tape Format (.bak):
- From the Convert SQL Backup files to list, select the file format that you want to convert to:
- Choose Microsoft Tape Format (.bak) to convert version 5 or greater SQL Backup files (.sqb) to native Microsoft Tape Format files (.bak).
- Choose SQL Backup 5 (.sqb) to convert version 6 or greater SQL Backup files (.sqb) to version 5 SQL Backup files (.sqb).
- Select the required Conversion Options to control how the converted files are named and saved.
- Click Add Files and browse for the files that you want to convert.
Valid SQL Backup files are shown with a Conversion status of Pending. If there is a problem with a file, it is shown with a Conversion status of Error. Click the file to view more information about the problem.
Encrypted files are marked with a padlock icon . If you have added encrypted files, you must also enter the password in the Password box beneath the file list. The same password will be used to decrypt every encrypted file. - Click Convert. Each file in the list is converted and saved according to the conversion options you have selected.
Successfully converted files are shown with a Conversion status of Successful. Files that could not be converted are shown with a Conversion status of Error. Click the file to view more information about the problem.
THREADCOUNT > 1), SQBConverter.exe will generate a Microsoft Tape Format file (.bak) for each thread.Sql To Jpql Converter Tool Online
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