Beispiel für Spring Boot JDBC + Oracle-Datenbank + Commons DBCP2
In diesem Artikel zeigen wir Ihnen, wie Sie eine Spring Boot JDBC-Anwendung + eine Oracle-Datenbank + einen Commons DBCP2-Verbindungspool erstellen.
In diesem Artikel verwendete Tools:
-
Spring Boot 1.5.1.RELEASE
-
Oracle-Datenbank 11g Express
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Oracle JDBC-Treiber ojdbc7.jar
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Commons DBCP2 2.1.1
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Maven
-
Java 8
Note
Verwandte -Spring Boot JDBC + MySQL + HikariCP example
1. Projektstruktur
Eine Standard-Maven-Projektstruktur.
2. Projektabhängigkeit
Download and Install Oracle JDBC driver.
Oracle-Lizenzbeschränkung. Sie können den Oracle JDBC-Treiber nicht aus dem öffentlichen Maven-Repository abrufen. Stattdessen müssen Sie die Oracle-Website aufrufen, um den Treiber undinstall into the Local Maven repository manually herunterzuladen.
Deklariert Spring Boot JDBCspring-boot-starter-jdbc, Oracle JDBC-Treiber (manuell installieren)ojdbc7 und Common DBCP2-Verbindungspool.
pom.xml
4.0.0 com.example spring-boot-jdbc jar 1.0 org.springframework.boot spring-boot-starter-parent 1.5.1.RELEASE 1.8 org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-jdbc org.apache.tomcat tomcat-jdbc com.oracle ojdbc7 12.1.0 org.apache.commons commons-dbcp2 2.1.1 org.springframework.boot spring-boot-maven-plugin
Terminal
$ mvn dependency:tree [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building spring-boot-jdbc 1.0 [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-dependency-plugin:2.10:tree (default-cli) @ spring-boot-jdbc --- [INFO] com.example:spring-boot-jdbc:jar:1.0 [INFO] +- org.springframework.boot:spring-boot-starter:jar:1.5.1.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot:jar:1.5.1.RELEASE:compile [INFO] | | \- org.springframework:spring-context:jar:4.3.6.RELEASE:compile [INFO] | | +- org.springframework:spring-aop:jar:4.3.6.RELEASE:compile [INFO] | | \- org.springframework:spring-expression:jar:4.3.6.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.1.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-starter-logging:jar:1.5.1.RELEASE:compile [INFO] | | +- ch.qos.logback:logback-classic:jar:1.1.9:compile [INFO] | | | +- ch.qos.logback:logback-core:jar:1.1.9:compile [INFO] | | | \- org.slf4j:slf4j-api:jar:1.7.22:compile [INFO] | | +- org.slf4j:jcl-over-slf4j:jar:1.7.22:compile [INFO] | | +- org.slf4j:jul-to-slf4j:jar:1.7.22:compile [INFO] | | \- org.slf4j:log4j-over-slf4j:jar:1.7.22:compile [INFO] | +- org.springframework:spring-core:jar:4.3.6.RELEASE:compile [INFO] | \- org.yaml:snakeyaml:jar:1.17:runtime [INFO] +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.5.1.RELEASE:compile [INFO] | \- org.springframework:spring-jdbc:jar:4.3.6.RELEASE:compile [INFO] | +- org.springframework:spring-beans:jar:4.3.6.RELEASE:compile [INFO] | \- org.springframework:spring-tx:jar:4.3.6.RELEASE:compile [INFO] +- com.oracle:ojdbc7:jar:12.1.0:compile [INFO] \- org.apache.commons:commons-dbcp2:jar:2.1.1:compile [INFO] +- org.apache.commons:commons-pool2:jar:2.4.2:compile [INFO] \- commons-logging:commons-logging:jar:1.2:compile [INFO] ------------------------------------------------------------------------
Database Connection Pooling
Spring Boot verwendet standardmäßig Tomcat-Poolingtomcat-jdbc. Befolgen Sie diese Reihenfolge, um den Verbindungspool zu finden:
Tomcat pool -->> - HikariCP -->> Commons DBCP -->> Commons DBCP2
Lesen Sie dieses offizielle Spring Boot-Dokument -Connection to a production database
3. JdbcTemplate
3.1 Spring Boot will register a JdbcTemplate bean automatically, just inject it into your bean.
CustomerRepository.java
package com.example.dao;
import com.example.model.Customer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public class CustomerRepository {
@Autowired
private JdbcTemplate jdbcTemplate;
// thanks Java 8, look the custom RowMapper
public List findAll() {
List result = jdbcTemplate.query(
"SELECT id, name, email, created_date FROM customer",
(rs, rowNum) -> new Customer(rs.getInt("id"),
rs.getString("name"), rs.getString("email"), rs.getDate("created_date"))
);
return result;
}
}
3.2 Customer Model.
Customer.java
package com.example.model;
import java.util.Date;
public class Customer {
int id;
String name;
String email;
Date date;
public Customer(int id, String name, String email, Date date) {
this.id = id;
this.name = name;
this.email = email;
this.date = date;
}
//getters and setters and toString...
}
4. Datenbankinitialisierung
Spring Boot aktiviert standardmäßig den dataSource-Initialisierer und lädt SQL-Skripte -schema.sql unddata.sql aus dem Stammverzeichnis des Klassenpfads.
4.1 SQL script to create a customer table.
schema.sql
CREATE TABLE CUSTOMER( ID NUMBER(10) NOT NULL, NAME VARCHAR2(100) NOT NULL, EMAIL VARCHAR2(100) NOT NULL, CREATED_DATE DATE NOT NULL, CONSTRAINT CUSTOMER_PK PRIMARY KEY (ID) );
4.2 SQL script to insert 3 rows into the customer table.
data.sql
INSERT INTO "CUSTOMER" (ID, NAME, EMAIL, CREATED_DATE) VALUES(1, 'example','[email protected]', TO_DATE('2017-02-11', 'yyyy-mm-dd')); INSERT INTO "CUSTOMER" (ID, NAME, EMAIL, CREATED_DATE) VALUES(2, 'yflow','[email protected]', TO_DATE('2017-02-12', 'yyyy-mm-dd')); INSERT INTO "CUSTOMER" (ID, NAME, EMAIL, CREATED_DATE) VALUES(3, 'zilap','[email protected]', TO_DATE('2017-02-13', 'yyyy-mm-dd'));
Note
Lesen Sie dies -Spring Database initialization
5. Aufbau
Konfigurieren Sie Oracle unddbcp2 settings.
application.properties
spring.main.banner-mode=off # Set true for first time db initialization. spring.datasource.initialize=true spring.datasource.url=jdbc:oracle:thin:@localhost:1521:xe spring.datasource.username=system spring.datasource.password=password spring.datasource.driver-class-oracle.jdbc.driver.OracleDriver # dbcp2 settings # spring.datasource.dbcp2.* spring.datasource.dbcp2.initial-size=7 spring.datasource.dbcp2.max-total=20 spring.datasource.dbcp2.pool-prepared-statements=true
6. @SpringBootApplication
Spring Boot-Befehlszeilenanwendung
SpringBootConsoleApplication.java
package com.example;
import com.example.dao.CustomerRepository;
import com.example.model.Customer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import javax.sql.DataSource;
import java.util.List;
import static java.lang.System.exit;
@SpringBootApplication
public class SpringBootConsoleApplication implements CommandLineRunner {
@Autowired
DataSource dataSource;
@Autowired
CustomerRepository customerRepository;
public static void main(String[] args) throws Exception {
SpringApplication.run(SpringBootConsoleApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
System.out.println("DATASOURCE = " + dataSource);
/// Get dbcp2 datasource settings
// BasicDataSource newds = (BasicDataSource) dataSource;
// System.out.println("BasicDataSource = " + newds.getInitialSize());
System.out.println("Display all customers...");
List list = customerRepository.findAll();
list.forEach(x -> System.out.println(x));
System.out.println("Done!");
exit(0);
}
}
7. DEMO
Führen Sie es aus, Spring Boot lädt die Skripteschema.sql unddata.sql automatisch und zeigt das Ergebnis an.
Terminal
DATASOURCE = org.apache.commons.dbcp2.BasicDataSource@4eb386df
Display all customers...
Customer{id=1, name='example', email='[email protected]', date=2017-02-11}
Customer{id=2, name='yflow', email='[email protected]', date=2017-02-12}
Customer{id=3, name='zilap', email='[email protected]', date=2017-02-13}
Done!
Wenn Sie in der Debugsitzung einen Haltepunkt festlegen, lesen Sie die Oracle-Webadministrationssitzungsseite.
Quellcode herunterladen
Herunterladen -spring-boot-jdbc-oracle-example.zip (7 KB)