1.1作用

1：建表语句 2：运行插入的sql语句

1.2源码解读

只要两个条件符合就执行，DataSourceInitializationMode属性，看起来是通过配置文件获取的

private boolean isEnabled() {
        DataSourceInitializationMode mode = this.properties.getInitializationMode();
        if (mode == DataSourceInitializationMode.NEVER) {
            return false;
        } else {
            return mode != DataSourceInitializationMode.EMBEDDED || this.isEmbedded();
        }
    }

    private boolean isEmbedded() {
        try {
            return EmbeddedDatabaseConnection.isEmbedded(this.dataSource);
        } catch (Exception var2) {
            logger.debug("Could not determine if datasource is embedded", var2);
            return false;
        }
    }

从指定的路径获取脚本

private List<Resource> getScripts(String propertyName, List<String> resources, String fallback) {
        if (resources != null) {
            return this.getResources(propertyName, resources, true);
        } else {
            String platform = this.properties.getPlatform();
            List<String> fallbackResources = new ArrayList();
            fallbackResources.add("classpath*:" + fallback + "-" + platform + ".sql");
            fallbackResources.add("classpath*:" + fallback + ".sql");
            return this.getResources(propertyName, fallbackResources, false);
        }
    }

初始化Schema.,其第三个参数为

data

void initSchema() {
      List<Resource> scripts = this.getScripts("spring.datasource.data", this.properties.getData(), "data");
      if (!scripts.isEmpty()) {
          if (!this.isEnabled()) {
              logger.debug("Initialization disabled (not running data scripts)");
              return;
          }

          String username = this.properties.getDataUsername();
          String password = this.properties.getDataPassword();
          this.runScripts(scripts, username, password);
      }

  }

进行判断，其中第三个参数为

schema

 boolean createSchema() {
        List<Resource> scripts = this.getScripts("spring.datasource.schema", this.properties.getSchema(), "schema");
        if (!scripts.isEmpty()) {
            if (!this.isEnabled()) {
                logger.debug("Initialization disabled (not running DDL scripts)");
                return false;
            }

            String username = this.properties.getSchemaUsername();
            String password = this.properties.getSchemaPassword();
            this.runScripts(scripts, username, password);
        }

        return !scripts.isEmpty();
    }

从getScripts（….）可知，其中其默认的文件路径为

在2个默认路径下实现sql的建表

		classpath*:schema-all.sql 
		或者	classpath*:schema.sql

 List<String> fallbackResources = new ArrayList();
            fallbackResources.add("classpath*:" + fallback + "-" + platform + ".sql");
            fallbackResources.add("classpath*:" + fallback + ".sql");

测试：在路径下新建sql文件

sql文件:建立一张普通表.（已实现数据库的连接）

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for department
-- ----------------------------
DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `departmentName` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

1.1从database中可以看出已经生成了department表 注！2.0必须在配置文件中加入initialization-mode: always，不然无法生效.


1.2也可以通过schema指定指定的路径而不使用其默认的文件路径[List]

spring:
  datasource:
    username: root
    password: 12xxsd
    url: jdbc:mysql://localhost:xxxx/student?useSSL=false&userUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver
    initialization-mode: always
    schema:
      - classpath:department.sql

2：同理也可以操作实行

从JdbcTemplateConfiguration中看出springboot已自动帮我们配置了jdbctemplate,我们可以直接使用即可.

@RestController
public class ControllerTest {

    @Autowired
    JdbcTemplate jdbcTemplate;
    @RequestMapping("/hello")
    public Map<String, Object> hello(){

        List<Map<String, Object>> maps = jdbcTemplate.queryForList("select *from account");
        System.out.println(maps);
        return maps.get(0);//返回第一条
    }
}

总结

1:**在2个默认路径下实现sql的建表**

		classpath*:schema-all.sql 
		或者	classpath*:schema.sql

2

必须配置initialization-mode: always


3

可修改其访问文件名

:schema:

– classpath:department.sql

4.

springboot已自动配置Template可直接使用.进行执行sql