SpringBoot2.6 集成Druid 启动项目 运行SQL文件 自动生成数据库表及数据

SpringBoot项目启动运行SQL文件 自动生成数据库表及数据。

第一步：创建SpringBoot项目，添加依赖

 <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.30</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.3.22</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.2.13</version>
</dependency>

第二步：在resources目录下创建目录sql，然后在其中提供如下所示的两个文件

• db_schema.sql

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for tb_dept
-- ----------------------------
DROP TABLE IF EXISTS `tb_dept`;
CREATE TABLE `tb_dept`  (
  `deptno` tinyint UNSIGNED NOT NULL COMMENT '部门编号',
  `dname` varchar(14) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '部门名称',
  `loc` varchar(13) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '部门地址',
  PRIMARY KEY (`deptno`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = DYNAMIC;

-- ----------------------------
-- Table structure for tb_emp
-- ----------------------------
DROP TABLE IF EXISTS `tb_emp`;
CREATE TABLE `tb_emp`  (
  `empno` int UNSIGNED NOT NULL,
  `ename` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `job` varchar(9) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `mgr` int UNSIGNED NULL DEFAULT NULL,
  `hiredate` date NULL DEFAULT NULL,
  `sal` decimal(7, 2) NULL DEFAULT NULL,
  `comm` decimal(7, 2) NULL DEFAULT NULL,
  `deptno` tinyint UNSIGNED NULL DEFAULT NULL,
  PRIMARY KEY (`empno`) USING BTREE,
  INDEX `deptno`(`deptno` ASC) USING BTREE,
  CONSTRAINT `tb_emp_ibfk_1` FOREIGN KEY (`deptno`) REFERENCES `tb_dept` (`deptno`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = DYNAMIC;

SET FOREIGN_KEY_CHECKS = 1;

• db_data.sql

-- ----------------------------
-- Records of tb_dept
-- ----------------------------
INSERT INTO `tb_dept` VALUES (10, 'ACCOUNTING', 'NEW YORK');
INSERT INTO `tb_dept` VALUES (20, 'RESEARCH', 'DALLAS');
INSERT INTO `tb_dept` VALUES (30, 'SALES', 'CHICAGO');
INSERT INTO `tb_dept` VALUES (40, 'OPERATIONS', 'BOSTON');

-- ----------------------------
-- Records of tb_emp
-- ----------------------------
INSERT INTO `tb_emp` VALUES (7369, 'SMITH', 'CLERK', 7902, '1980-12-17', 800.00, NULL, 20);
INSERT INTO `tb_emp` VALUES (7499, 'ALLEN', 'SALESMAN', 7698, '1981-02-20', 1600.00, 300.00, 30);
INSERT INTO `tb_emp` VALUES (7521, 'WARD', 'SALESMAN', 7698, '1981-02-22', 1250.00, 500.00, 30);
INSERT INTO `tb_emp` VALUES (7566, 'JONES', 'MANAGER', 7839, '1981-04-02', 2975.00, NULL, 20);
INSERT INTO `tb_emp` VALUES (7654, 'MARTIN', 'SALESMAN', 7698, '1981-09-28', 1250.00, 1400.00, 30);
INSERT INTO `tb_emp` VALUES (7698, 'BLAKE', 'MANAGER', 7839, '1981-05-01', 2850.00, NULL, 30);
INSERT INTO `tb_emp` VALUES (7782, 'CLARK', 'MANAGER', 7839, '1981-06-09', 2450.00, NULL, 10);
INSERT INTO `tb_emp` VALUES (7788, 'SCOTT', 'ANALYST', 7566, '1987-04-19', 3000.00, NULL, 20);
INSERT INTO `tb_emp` VALUES (7839, 'KING', 'PRESIDENT', NULL, '1981-11-17', 5000.00, NULL, 10);
INSERT INTO `tb_emp` VALUES (7844, 'TURNER', 'SALESMAN', 7698, '1981-09-08', 1500.00, 0.00, 30);
INSERT INTO `tb_emp` VALUES (7876, 'ADAMS', 'CLERK', 7788, '1987-05-23', 1100.00, NULL, 20);
INSERT INTO `tb_emp` VALUES (7900, 'JAMES', 'CLERK', 7698, '1981-12-03', 950.00, NULL, 30);
INSERT INTO `tb_emp` VALUES (7902, 'FORD', 'ANALYST', 7566, '1981-12-03', 3000.00, NULL, 20);
INSERT INTO `tb_emp` VALUES (7934, 'MILLER', 'CLERK', 7782, '1982-01-23', 1300.00, NULL, 10);

第三步：配置application.yml

spring:
  sql:
    init:
      separator: ; #断句分隔符，默认为 ; 号，如果执行语句中有 存储过程 或 游标 这种 则需要更改
      encoding: UTF-8
      platform: mysql #默认值为all 在不同数据库切换的情况下才使用 all 配置，spring boot 会自动检测当前使用的数据库
      mode: always # 初始化模式，有三个值：always：始终执行初始化、embedded：只初始化内存数据库（默认）、never：不执行初始化
      schema-locations: #表初始化语句 DDL，默认加载 schema.sql
        - classpath:sql/db_schema.sql
      data-locations: #数据初始化 DQL（数据查询）或 DML（数据操作），默认加载 data.sql，
        - classpath:sql/db_data.sql
  #配置数据源
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://127.0.0.1:3306/db_demo?useSSL=false&serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=UTF8&autoReconnect=true&failOverReadOnly=false
      username: root
      password: root

第四步：创建数据库

在MySQL中创建数据库db_demo:

第五步：运行SpringBoot项目

运行SpringBoot项目，再次打开数据库，发现创建了表并在表中生成了数据。 在启动时会自动 创建 表，如果表已经存在，但新增加的字段不存在那么，会自动创建字段，如果字段已经存在，那么什么也不改变。