feat: 支持达梦数据库查询

server/internal/db/dbm/metasql/dm_meta.sql

@@ -0,0 +1,56 @@
+--DM_DB_SCHEMAS 库schemas
+select
+    distinct owner as schemaName
+from dba_objects
+---------------------------------------
+--DM_TABLE_INFO 表详细信息
+select
+    a.object_name as tableName,
+    b.comments as tableComment,
+    a.created as createTime,
+    TABLE_USED_SPACE((SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID)), a.object_name)*page() as dataLength
+from dba_objects a
+         JOIN USER_TAB_COMMENTS b ON b.TABLE_TYPE='TABLE' and a.object_name = b.TABLE_NAME
+where a.owner = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
+  and a.object_type = 'TABLE'
+---------------------------------------
+--DM_INDEX_INFO 表索引信息
+SELECT
+    indexname AS "indexName",
+    'BTREE' AS "IndexType",
+    case when indexdef like 'CREATE UNIQUE INDEX%%' then 0 else 1 end as "nonUnique",
+    obj_description(b.oid, 'pg_class') AS "indexComment",
+    indexdef AS "indexDef",
+    c.attname AS "columnName",
+    c.attnum AS "seqInIndex"
+FROM pg_indexes a
+     join pg_class b on a.indexname = b.relname
+     join pg_attribute c on b.oid = c.attrelid
+WHERE a.schemaname = (select current_schema())
+  AND a.tablename = '%s';
+---------------------------------------
+--DM_COLUMN_MA 表列信息
+select a.table_name                                                                        as tableName,
+       a.column_name                                                                       as columnName,
+       case when a.NULLABLE = 'Y' then 'YES' when a.NULLABLE = 'N' then 'NO' else 'NO' end as nullable,
+       case
+           when a.char_col_decl_length > 0 then concat(a.data_type, '(', a.char_col_decl_length, ')')
+           when a.data_precision > 0 and a.data_scale > 0
+               then concat(a.data_type, '(', a.data_precision, ',', a.data_scale, ')')
+           else a.data_type end
+                                                                                           as columnType,
+       b.comments                                                                          as columnComment,
+       a.data_default                                                                      as columnDefault,
+       a.data_scale                                                                        as numScale,
+       case when t.COL_NAME = a.column_name then 'PRI' else '' end                         as columnKey
+from dba_tab_columns a
+         join user_col_comments b on b.owner = a.owner and b.table_name = a.table_name and a.column_name = b.column_name
+         join (select b.owner, b.table_name, a.name COL_NAME
+               from SYS.SYSCOLUMNS a,
+                    dba_tables b,
+                    sys.sysobjects c
+               where a.INFO2 & 0x01 = 0x01
+   and a.id=c.id and c.name = b.table_name) t on t.owner = a.owner and t.table_name = a.table_name
+where a.owner = (SELECT SF_GET_SCHEMA_NAME_BY_ID(CURRENT_SCHID))
+  and a.table_name in (%s)
+order by a.table_name, a.column_id