In this post I will show you how to use NamedParameterJdbcTemplate and BeanPropertySqlParameterSource to execute query. The NamedParameterJdbcTemplate class adds support for programming JDBC statements using named parameters, as opposed to programming JDBC statements using only classic placeholder (?) arguments. The NamedParameterJdbcTemplate class wraps a JdbcTemplate, and delegates to the wrapped JdbcTemplate to do much of its work.
An SqlParameterSource is a source of named parameter values to a NamedParameterJdbcTemplate. The BeanPropertySqlParameterSource class is an implementation of SqlParameterSource interface. This class wraps an arbitrary Java Bean (that is, an instance of a class that adheres to the Java Bean conventions), and uses the properties of the wrapped Java Bean as the source of named parameter values.
Prerequisites
Java at least 8, Gradle 6.5.1, Maven 3.6.3, Spring Boot 2.3.2, MySQL 8.0.17
Project Setup
You can create either gradle or maven based project in Eclipse or in your favorite IDE or tool. The name of the project is spring-namedparameterjdbctemplate-beanpropertysqlparametersource.
If you are creating gradle based project then you can use below build.gradle script:
buildscript {
ext {
springBootVersion = '2.3.2.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
plugins {
id 'java-library'
id 'org.springframework.boot' version "${springBootVersion}"
}
sourceCompatibility = 12
targetCompatibility = 12
repositories {
mavenCentral()
}
dependencies {
implementation "org.springframework.boot:spring-boot-starter:${springBootVersion}"
implementation("org.springframework.boot:spring-boot-starter-jdbc:${springBootVersion}")
runtime("mysql:mysql-connector-java:8.0.17")
//required for jdk 9 or above
runtimeOnly('javax.xml.bind:jaxb-api:2.4.0-b180830.0359')
}If you are creating maven based project then you can use below pom.xml file:
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.roytuts</groupId>
<artifactId>spring-namedparameterjdbctemplate-beanpropertysqlparametersource</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>
<!--required only if jdk 9 or higher version is used-->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.4.0-b180830.0359</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>at least 8</source>
<target>at least 8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>MySQL Table
You need to create a table called user under roytuts database in MySQL server.
CREATE TABLE `user` (
`id` int unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(50) NOT NULL,
`email` varchar(100) NOT NULL,
`phone` int unsigned NOT NULL,
`address` varchar(250) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;Database Configuration
I will use annotation based configuration and we need to create appropriate beans for working with database.
I am using application.properties file which is kept under src/main/resources classpath folder.
The content of the properties file is given below:
spring.datasource.url=jdbc:mysql://localhost/roytuts
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
#disable schema generation from Hibernate
spring.jpa.hibernate.ddl-auto=noneThe required configuration Java class is given below:
package com.roytuts.spring.namedparameterjdbctemplate.beanpropertysqlparametersource.config;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
@Configuration
@PropertySource("classpath:application.properties")
public class Config {
@Autowired
private Environment environment;
@Bean
public DataSource dataSource() {
DriverManagerDataSource ds = new DriverManagerDataSource();
ds.setDriverClassName(environment.getRequiredProperty("spring.datasource.driverClassName"));
ds.setUrl(environment.getRequiredProperty("spring.datasource.url"));
ds.setUsername(environment.getRequiredProperty("spring.datasource.username"));
ds.setPassword(environment.getRequiredProperty("spring.datasource.password"));
return ds;
}
@Bean
public NamedParameterJdbcTemplate namedParameterJdbcTemplate(DataSource dataSource) {
NamedParameterJdbcTemplate jdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
return jdbcTemplate;
}
}
Model Class
You need to create a POJO class that will map table and Java class together.
package com.roytuts.spring.namedparameterjdbctemplate.collections.singletonmap.model;
public class User {
private Integer id;
private String name;
private String email;
private String phone;
private String address;
public User() {
}
public User(String name, String email, String phone, String address) {
this.name = name;
this.email = email;
this.phone = phone;
this.address = address;
}
//getters and setters
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", email=" + email + ", phone=" + phone + ", address=" + address
+ "]";
}
}DAO Class
DAO class is where perform database operations. For my example, here I am going to insert or add a new user record and count the number of users for the given user’s name and return returning the result.
package com.roytuts.spring.namedparameterjdbctemplate.beanpropertysqlparametersource.dao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;
import org.springframework.stereotype.Component;
import com.roytuts.spring.namedparameterjdbctemplate.beanpropertysqlparametersource.model.User;
@Component
public class UserDao {
@Autowired
private NamedParameterJdbcTemplate jdbcTemplate;
public void addUser(User user) {
final String sql = "insert into user(id, name, email, phone, address) values(:id, :name, :email, :phone, :address)";
SqlParameterSource paramSource = new BeanPropertySqlParameterSource(user);
jdbcTemplate.update(sql, paramSource);
}
public int countByName(User user) {
final String sql = "select count(*) from user where name = :name";
SqlParameterSource paramSource = new BeanPropertySqlParameterSource(user);
return jdbcTemplate.queryForObject(sql, paramSource, Integer.class);
}
}
Main Class
A class having main method with @SpringBootApplication annotation is enough to deploy the Spring Boot application into embedded Tomcat server.
package com.roytuts.spring.namedparameterjdbctemplate.beanpropertysqlparametersource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.roytuts.spring.namedparameterjdbctemplate.beanpropertysqlparametersource.dao.UserDao;
import com.roytuts.spring.namedparameterjdbctemplate.beanpropertysqlparametersource.model.User;
@SpringBootApplication
public class SpringBeanPropertySqlParameterSourceApp implements CommandLineRunner {
@Autowired
private UserDao dao;
public static void main(String[] args) {
SpringApplication.run(SpringBeanPropertySqlParameterSourceApp.class, args);
}
@Override
public void run(String... args) throws Exception {
dao.addUser(new User(1, "Soumitra", "soumitra@roytuts.com", "43256789", "Earth"));
User user = new User();
user.setName("Soumitra");
System.out.println("Number of Users: " + dao.countByName(user));
}
}
Testing the Application
Executing the above class will give you the following output:
Number of Users: 1Source Code
Thanks for reading.