fix: 机器文件下载问题修复&dbm重构

server/internal/db/dbm/dbi/metasql/mysql_meta.sql

@@ -0,0 +1,67 @@
+--MYSQL_DBS 数据库名信息
+SELECT
+	SCHEMA_NAME AS dbname
+FROM
+	information_schema.SCHEMATA
+WHERE
+	SCHEMA_NAME NOT IN ('mysql', 'information_schema', 'performance_schema')
+---------------------------------------
+--MYSQL_TABLE_INFO 表详细信息
+SELECT
+  table_name tableName,
+  table_comment tableComment,
+  table_rows tableRows,
+  data_length dataLength,
+  index_length indexLength,
+  create_time createTime
+FROM
+  information_schema.tables
+WHERE
+  table_type = 'BASE TABLE'
+  AND table_schema = (
+    SELECT
+      database ()
+  )
+---------------------------------------
+--MYSQL_INDEX_INFO 索引信息
+SELECT
+  index_name indexName,
+  column_name columnName,
+  index_type indexType,
+  non_unique nonUnique,
+  SEQ_IN_INDEX seqInIndex,
+  INDEX_COMMENT indexComment
+FROM
+  information_schema.STATISTICS
+WHERE
+  table_schema = (
+    SELECT
+      database ()
+  )
+  AND table_name = ?
+ORDER BY
+  index_name asc,
+  SEQ_IN_INDEX asc
+---------------------------------------
+--MYSQL_COLUMN_MA 列信息元数据
+SELECT
+  table_name tableName,
+  column_name columnName,
+  column_type columnType,
+  column_default columnDefault,
+  column_comment columnComment,
+  column_key columnKey,
+  extra extra,
+  is_nullable nullable,
+  NUMERIC_SCALE numScale
+from
+  information_schema.columns
+WHERE
+  table_schema = (
+    SELECT
+      database ()
+  )
+  AND table_name in (%s)
+ORDER BY
+  tableName,
+  ordinal_position