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Click Here to SUBSCRIBE!Mastering Database Fetching in Spring Boot
Retrieving data is the most common task in any application. Whether you're building a dashboard or a simple list view, you need to know how to pull all records from your database. In this guide, we dive into how Spring Boot's JdbcTemplate makes fetching list data simple and efficient.
What is JdbcTemplate Querying?
JdbcTemplate provides several methods to retrieve data. While some methods fetch a single record, the query() method is specifically designed to handle multiple rows, returning them as a List of objects that your application can easily use.
The Power of RowMapper
The secret to fetching multiple records is the RowMapper. This interface tells Spring how to map each row from the database result set into a Java object. It’s like a bridge between your SQL tables and your Java code.
Step-by-Step Implementation
- Write the SQL: Use a simple query like
"SELECT * FROM employees". - Create a Mapper: Define how each column maps to your class fields.
- Execute & Collect: Use
jdbcTemplate.query(sql, mapper)to get your full list of data.
Why Choose This Approach?
Using JdbcTemplate for fetching records gives you maximum performance. Unlike heavy ORMs, it executes direct SQL, making it ideal for applications where speed and low memory usage are critical.
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