fix(DevGeneratePaginatedSqlProcessor): 修复全量同步阶段数据查询逻辑

- 修改 whereClause初始值为 null，优化逻辑判断
- 在全量同步阶段添加数据范围限制条件
-针对不同数据库类型调整分页 SQL 语句格式

nifi-hzyadev-bundle/hzya-nifi-DevGeneratePaginatedSqlProcessor-processors/src/main/java/com/hzya/frame/DevGeneratePaginatedSqlProcessor.java

@@ -110,7 +110,7 @@ public class DevGeneratePaginatedSqlProcessor extends AbstractProcessor {
 
             try (Connection conn = dbcpService.getConnection(); Statement stmt = conn.createStatement()) {
                 // 构建 WHERE 条件
-                String whereClause = "";
+                String whereClause = null;
                 if (oldMaximumValue != null && !oldMaximumValue.isEmpty()) {
                     whereClause = " WHERE " + maxValColumn + " > '" + oldMaximumValue + "'";
                 }
@@ -143,14 +143,23 @@ public class DevGeneratePaginatedSqlProcessor extends AbstractProcessor {
                     long startRow = (long) page * pageSize + 1;
                     long endRow = Math.min((long) (page + 1) * pageSize, rowNumber);
 
+                    //全量同步阶段，确定全量数据范围
+                    if (whereClause == null) {
+                        whereClause = " WHERE " + maxValColumn + " <= '" + queriedMaximumValue + "'";
+                    }
+
                     String paginatedSql;
                     if ("oracle".equals(dbType)) {
-                        paginatedSql = "SELECT * FROM (\n" + "    SELECT inner_query.*, ROWNUM rn FROM (\n" + "        " + baseSql + whereClause + "\n" + "    ) inner_query WHERE ROWNUM <= " + endRow + "\n" + ") WHERE rn >= " + startRow;
+                        paginatedSql = "SELECT * FROM (\n"
+                                + "    SELECT inner_query.*, ROWNUM rn FROM (\n"
+                                + "        "
+                                + "select * from (" + baseSql + ")" + whereClause + "\n"
+                                + "    ) inner_query WHERE ROWNUM <= " + endRow + "\n" + ") WHERE rn >= " + startRow;
                     } else if ("mysql".equals(dbType)) {
                         long offset = startRow - 1;
-                        paginatedSql = baseSql + whereClause + " LIMIT " + pageSize + " OFFSET " + offset;
+                        paginatedSql = "select * from (" + baseSql + ")" + whereClause + " LIMIT " + pageSize + " OFFSET " + offset;
                     } else if ("sqlserver".equals(dbType)) {
-                        paginatedSql = baseSql + whereClause + " OFFSET " + (startRow - 1) + " ROWS FETCH NEXT " + pageSize + " ROWS ONLY";
+                        paginatedSql = "select * from (" + baseSql + ")" + whereClause + " OFFSET " + (startRow - 1) + " ROWS FETCH NEXT " + pageSize + " ROWS ONLY";
                     } else {
                         throw new ProcessException("不支持的数据库类型: " + dbType);
                     }