- The Spring JdbcTemplate is a powerful and flexible tool for working with databases in a Spring application. It simplifies database access by abstracting many of the low-level details of JDBC (Java Database Connectivity) and providing a higher-level, more intuitive API.
In this Spring JdbcTemplate tutorial, you’ll learn how to use JdbcTemplate to perform common database operations in a Spring application.
Table of Contents:
Introduction to Spring JdbcTemplate:
- Understand what Spring JdbcTemplate is and why it’s useful.
- Learn about its benefits over raw JDBC.
Setting Up a Spring Project:
- Create a new Spring project using Maven or Gradle.
- Add the necessary Spring and database-related dependencies to your project.
Configuring DataSource:
- Configure a data source bean (e.g., DataSource) in your Spring configuration to connect to your database.
CRUD Operations:
- Perform basic CRUD (Create, Read, Update, Delete) operations using JdbcTemplate.
- Learn how to insert, query, update, and delete records.
Working with Parameters:
- Pass parameters to SQL queries using JdbcTemplate’s parameterized query methods.
- Handle different types of parameters (e.g., named parameters, positional parameters).
Mapping Query Results:
- Map query results to Java objects using RowMapper.
- Learn about JdbcTemplate’s built-in RowMapper and how to create custom RowMappers.
JdbcTemplate class
- It is the central class in the Spring JDBC support classes. It takes care of creation and release of resources such as creating and closing of connection object etc. So it will not lead to any problem if you forget to close the connection.
- It handles the exception and provides the informative exception messages by the help of excepion classes defined in the org.springframework.dao package.
| No. | Method | Description |
|---|---|---|
| 1. | public int update(String query) | is used to insert, update and delete records. |
| 2. | public int update(String query,Object... args) | is used to insert, update and delete records using PreparedStatement using given arguments. |
| 3. | public void execute(String query) | is used to execute DDL query. |
| 4. | public T execute(String sql, PreparedStatementCallback action) | executes the query by using PreparedStatement callback. |
| 5. | Public T query(String sql, ResultSetExtractor rse) | is used to fetch records using ResultSetExtractor. |
| 6. | public List query(String sql, RowMapper rse) | is used to fetch records using RowMapper. |
Example of Spring JdbcTemplate
- We are assuming that you have created the following table inside the Oracle10g database.
create table employee(
id number(10),
name varchar2(100),
salary number(10)
);
- Throughout this tutorial, you’ll build a solid foundation in using Spring JdbcTemplate to interact with databases, enabling you to create robust and efficient database-driven applications with Spring.
