我試圖讓外鍵中的操作發生更改(在刪除/更新時)。在外鍵約束中獲取ON DELETE ON UPDATE操作
我試圖檢查在尋找INFORMATION_SCHEMA.key_column_usage:
SELECT *
FROM `INFORMATION_SCHEMA`.`key_column_usage`
WHERE `referenced_table_schema` = '{$this->dbName}'
AND `referenced_table_name` IS NOT NULL
AND `table_name` = '{$this->tableName}'
它顯示了這樣的事情:
0 =>
array (size=12)
'CONSTRAINT_CATALOG' => string 'def' (length=3)
'CONSTRAINT_SCHEMA' => string 'test' (length=4)
'CONSTRAINT_NAME' => string 'profiles_ibfk_1' (length=15)
'TABLE_CATALOG' => string 'def' (length=3)
'TABLE_SCHEMA' => string 'test' (length=4)
'TABLE_NAME' => string 'profiles' (length=8)
'COLUMN_NAME' => string 'id' (length=2)
'ORDINAL_POSITION' => string '1' (length=1)
'POSITION_IN_UNIQUE_CONSTRAINT' => string '1' (length=1)
'REFERENCED_TABLE_SCHEMA' => string 'test' (length=4)
'REFERENCED_TABLE_NAME' => string 'users' (length=5)
'REFERENCED_COLUMN_NAME' => string 'id' (length=2)
....
我INFORMATION_SCHEMA.TABLE_CONSTRAITS tryed也和我得到:
0 =>
array (size=6)
'CONSTRAINT_CATALOG' => string 'def' (length=3)
'CONSTRAINT_SCHEMA' => string 'test' (length=4)
'CONSTRAINT_NAME' => string 'PRIMARY' (length=7)
'TABLE_SCHEMA' => string 'test' (length=4)
'TABLE_NAME' => string 'profiles' (length=8)
'CONSTRAINT_TYPE' => string 'PRIMARY KEY' (length=11)
....
2例中沒有關於刪除/更新的操作。
我能明白嗎?怎麼樣?如果我可以的話。
簡單和偉大的工作,謝謝兄弟。 – 2013-04-29 15:13:34