3、springboot连接数据库
系列导航
6、SpringBoot-mybatis分页实现pagehelper
9、SpringBoot-mybatis-druid多源数据多源数据
10、SpringBoot-mybatis-plus-druid多源数据
11、SpringBoot-mybatis-plus-druid多源数据事务
12、SpringBoot-mybatis-plus-ehcache
14、SpringBoot-easyexcel导出excle
完结
本文意在使用最简单的方式让项目连接数据库，后续还会将一些总结的经验逐步发出来供大家参考
注：这里连接的是oracle，如果要换mysql把依赖换一下，配置文件里连接配置改一改就行。
1、创建springboot项目，主要步骤如下，
具体步骤参见之前的项目创建文档 1、springboot工程新建（单模块）
2、pom.xml文件
pom.xml由spring boot自动生成也可以自行修改，注意已经包含了web, jdbc, oracle的依赖配置
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.1.17.RELEASE</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.17.RELEASE</version>
<configuration>
<mainClass>com.example.demo.DemoApplication</mainClass>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
3、配置数据源
打开文件：application.properties，该文件在 src -> main -> resources 目录，配置数
# 应用名称
spring.application.name=demo
# 应用服务 WEB 访问端口
server.port=8080
# 数据库设置
spring.datasource.driverClassName=oracle.jdbc.OracleDriver
spring.datasource.url=jdbc:oracle:thin:@192.168.0.100:1521:orcl
spring.datasource.username=zy
spring.datasource.password=1
4、数据库
oracle里创建表及初始化表
注：oralce中创建的用户为zy，密码为1
CREATE TABLE TEST_BLOCK_T
(
BLOCK_ID VARCHAR2(10 BYTE) PRIMARY KEY, --编码
BLOCK_NAME VARCHAR2(200 BYTE) --资源名称
);
Insert into TEST_BLOCK_T (BLOCK_ID, BLOCK_NAME) Values ('1', 'java');
COMMIT;
5、创建HelloController.java
package com.example.demo.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/hello")
public class HelloController {
@Autowired
JdbcTemplate jdbcTemplate;
@GetMapping("/list")
@ResponseBody
public String index() {
String sql = "SELECT BLOCK_NAME FROM TEST_BLOCK_T WHERE BLOCK_ID = ?";
// 通过jdbcTemplate查询数据库
String mobile = (String) jdbcTemplate.queryForObject(
sql, new Object[]{1}, String.class);
return "Hello " + mobile;
}
}
6、启动项目访问项目
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