Oracle的all_objects
視圖包含了當(dāng)前用戶可訪問的所有對象的信息,包括表、視圖、索引、存儲(chǔ)過程等
查看所有對象:
SELECT object_name, object_type, owner
FROM all_objects;
根據(jù)對象類型篩選:
SELECT object_name, object_type, owner
FROM all_objects
WHERE object_type = 'TABLE';
根據(jù)對象名稱搜索:
SELECT object_name, object_type, owner
FROM all_objects
WHERE object_name LIKE '%EMP%';
查看指定用戶下的所有對象:
SELECT object_name, object_type
FROM all_objects
WHERE owner = 'SCOTT';
查看表結(jié)構(gòu):
SELECT column_name, data_type, data_length, nullable
FROM all_tab_columns
WHERE table_name = 'EMPLOYEES';
查看存儲(chǔ)過程或函數(shù)的源代碼:
SELECT text
FROM all_source
WHERE name = 'MY_PROCEDURE'
AND type = 'PROCEDURE';
查看索引信息:
SELECT index_name, table_name, index_type, uniqueness
FROM all_indexes
WHERE table_owner = 'SCOTT';
查看約束信息:
SELECT constraint_name, constraint_type, table_name
FROM all_constraints
WHERE owner = 'SCOTT';
查看觸發(fā)器信息:
SELECT trigger_name, table_name, trigger_type, triggering_event
FROM all_triggers
WHERE owner = 'SCOTT';
通過這些示例,你可以利用all_objects
視圖和其他相關(guān)視圖來管理和查詢Oracle數(shù)據(jù)庫中的元數(shù)據(jù)。在實(shí)際應(yīng)用中,你可能需要根據(jù)自己的需求編寫更復(fù)雜的查詢語句。