How to get data from raw query in spring boot?

how to execute sql query in spring boot
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I have a query:

Query q = em.createNativeQuery("select DISTINCT id, rating, random() as ordering FROM table\n" +
                " WHERE id not in (1,2) ORDER BY ordering LIMIT 10");
List data = q.getResultList();

Every element of this list is array like object:

I want to retrieve that "8" and "16" and compose a comma separated string (to use it in my query in "not in" section in future):

for (Object x : data) {
    System.out.println(Arrays.asList(x).get(0));
}

But it produces strings:

[Ljava.lang.Object;@ee93cd3
[Ljava.lang.Object;@62f3c3e1

I don't know how to get that IDs ("8" and "16")


1.I think this is what you are looking for... Convert JPA query.getResultList() to MY Objects.

or

List<Object[]> rows = q.getResultList(); for (Object[] row : rows) { System.out.println(row[0]); } 

Is it possible to use raw SQL within a Spring Repository, The @Query annotation allows to execute native queries by setting the nativeQuery flag to true. Quote from Spring Data JPA reference docs. Also, see this  To access the Relational Database by using JdbcTemplate in Spring Boot application, we need to add the Spring Boot Starter JDBC dependency in our build configuration file. Then, if you @Autowired the JdbcTemplate class, Spring Boot automatically connects the Database and sets the Datasource for the JdbcTemplate object.


in this line

List<Object[]> data = q.getResultList();

data is list of Object of form

[ [1,233, 0.000333], [1,233, 0.000333] ]

for (Object[] x : data) {
    // x is [1,233, 0.000333]
    System.out.println(x[0]);
}

Spring Data JPA @Query, All we have to do is to set the value of the nativeQuery attribute to true and define the native SQL query in the value attribute of the annotation: ? 1. To fetch data from database in Spring MVC application, you must follow these steps. Register your front controller and enable Spring MVC feature. Register your database credentials like URL, username, and password. Execute the SQL statement and store in a list. Iterate the list on JSP.


If I understood it correctly, you are looking for comma separated string of ID's. If so, then follow these steps might help you to solve the issue.

  1. Create a constructor in table which has only one parameter ID. (If you want you can add more parameters as well but make sure the value which you want it must be in constructor as well as in query.)

  2. Write sql query and execute it.

  3. It returns result and gather it in List which contains the object of the table.

  4. Get the string

dataList.stream().map(obj -> obj.getId()).collect(Collectors.joining(", "))

This will give you the comma separated string.

Spring Boot Data JPA @Query tutorial, Spring Boot Data JPA @Query tutorial shows how to create custom queries with data-h2.sql │ │ schema-h2.sql │ ├───static │ │ index.html Each entity must have at least two annotations defined: @Entity and @Id . Select Query. In order to define SQL to execute for a Spring Data repository method, we can annotate the method with the @Queryannotation — its valueattribute contains the JPQL or SQL to execute. The @Queryannotation takes precedence over named queries, which are annotated with @NamedQueryor defined in an orm.xmlfile.


Spring Data JPA Tutorial: Creating Database Queries With the , If you are not familiar with Spring Data JPA, you should read the following It supports both JPQL and SQL queries, and the query that is specified by integration, and end-to-end tests for Spring and Spring Boot Web Apps:. The Spring / Hibernate classes, which generate SQL statements and set the parameters, already contain the code for logging them. However, the level of those log statements is set to DEBUG and TRACE respectively, which is lower than the default level in Spring Boot – INFO .


Running Native Queries With the Spring Native Query Library, The method name is the name of the file that contains the SQL query; the Let's create a Spring Boot project with dependence, Spring Data JPA and For each method of the interface created above, we have to create a file  As Oliver points out, you can use Spring Data for that, but an alternative which you may or may not prefer would be to use MongoDB's more low-level Java Driver. Take a look at the MongoDB Java Driver 3.x or MongoDB Java Driver 2.x documentation for instructions on using that driver.


Getting Started, You will build an application that uses Spring's JdbcTemplate to access data stored in <artifactId>spring-boot-starter-data-jdbc</artifactId> </dependency> JdbcTemplate that makes it easy to work with SQL relational databases and JDBC. Hi, I have just started up on spring-data-mongodb and am using version 1.0.0.M2 and mongo-java-driver 2.6.3. Your tutorial was very useful to start with spring-data.