优化配置中心，增加 ConfigFrameworkDAO 的抽象，进一步解耦 framework

src/main/java/cn/iocoder/dashboard/modules/infra/dal/mysql/dao/config/InfConfigDAOImpl.java

@@ -0,0 +1,39 @@
+package cn.iocoder.dashboard.modules.infra.dal.mysql.dao.config;
+
+import cn.iocoder.dashboard.framework.apollo.internals.ConfigFrameworkDAO;
+import cn.iocoder.dashboard.modules.infra.dal.mysql.dataobject.config.InfConfigDO;
+import org.springframework.jdbc.core.BeanPropertyRowMapper;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+
+import javax.sql.DataSource;
+import java.sql.ResultSet;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * ConfigFrameworkDAO 实现类
+ *
+ * @author 芋道源码
+ */
+public class InfConfigDAOImpl implements ConfigFrameworkDAO {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    public InfConfigDAOImpl(String jdbcUrl, String username, String password) {
+        DataSource dataSource = new DriverManagerDataSource(jdbcUrl, username, password);
+        this.jdbcTemplate = new JdbcTemplate(dataSource);
+    }
+
+    @Override
+    public boolean selectExistsByUpdateTimeAfter(Date maxUpdateTime) {
+        return jdbcTemplate.query("SELECT id FROM inf_config WHERE update_time > ? LIMIT 1",
+                ResultSet::next, maxUpdateTime);
+    }
+
+    @Override
+    public List<InfConfigDO> getSysConfigList() {
+        return jdbcTemplate.query("SELECT `key`, `value`, update_time, deleted FROM inf_config", new BeanPropertyRowMapper<>(InfConfigDO.class));
+    }
+
+}