扩展data-mybatis-plus增加数据库初始化服务，应用实现指定接口并注册到容器即可完成自动初始化

Signed-off-by: luoshi <luoshi@qmth.com.cn>

data-mybatis-plus/src/main/java/com/qmth/boot/mybatis/service/DatabaseInitializeService.java

@@ -0,0 +1,49 @@
+package com.qmth.boot.mybatis.service;
+
+import org.apache.commons.lang3.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.aop.support.AopUtils;
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.stereotype.Component;
+
+import java.util.Map;
+
+@Component
+public class DatabaseInitializeService implements ApplicationListener<ContextRefreshedEvent> {
+
+    private static final Logger log = LoggerFactory.getLogger(DatabaseInitializeService.class);
+
+    private static final String SQL_SPLITE = ";";
+
+    private JdbcTemplate jdbcTemplate;
+
+    public DatabaseInitializeService(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
+    @Override
+    public synchronized void onApplicationEvent(ContextRefreshedEvent event) {
+        if (event.getApplicationContext().getParent() == null) {
+            Map<String, SqlProvider> beans = event.getApplicationContext().getBeansOfType(SqlProvider.class);
+            for (SqlProvider provider : beans.values()) {
+                String beanName = AopUtils.getTargetClass(provider).getName();
+                String content = StringUtils.trimToNull(provider.get());
+                if (content == null) {
+                    throw new RuntimeException("Blank content from SqlProvider: " + beanName);
+                }
+                String[] lines = StringUtils.split(content, SQL_SPLITE);
+                int count = 0;
+                for (String sql : lines) {
+                    if (StringUtils.isNotBlank(sql)) {
+                        jdbcTemplate.execute(sql);
+                        count++;
+                    }
+                }
+                log.info("Database initialize from SqlProvider: {}, execute count: {}", beanName, count);
+            }
+        }
+    }
+}

data-mybatis-plus/src/main/java/com/qmth/boot/mybatis/service/SqlProvider.java

@@ -0,0 +1,15 @@
+package com.qmth.boot.mybatis.service;
+
+/**
+ * SQL内容提供bean需要的接口
+ */
+public interface SqlProvider {
+
+    /**
+     * 获取SQL内容，支持多条SQL混合，会自动按照英文分号拆解<br/>
+     * 若内容为空，则初始化服务会抛出异常
+     *
+     * @return
+     */
+    String get();
+}