我怎麼知道，如果表是在MySQL

Question

父表中嘗試此查詢

SELECT 
      CONSTRAINT_CATALOG AS constraintCatalog, 
      CONSTRAINT_SCHEMA AS constraintSchema, 
      CONSTRAINT_NAME AS constraintName, 
      TABLE_CATALOG AS tableCatalog, 
      TABLE_SCHEMA AS tableSchema, 
      TABLE_NAME AS tableName, 
      COLUMN_NAME AS columnName, 
      ORDINAL_POSITION AS ordinalPosition, 
      POSITION_IN_UNIQUE_CONSTRAINT AS positionUniqueConstraint, 
      REFERENCED_TABLE_SCHEMA AS referencedTableSchema, 
      REFERENCED_TABLE_NAME AS referencedTableName, 
      REFERENCED_COLUMN_NAME AS referencedColumn 

     FROM 
      INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS 
     WHERE 
      TABLE_NAME = 'table_name' 

但問題我只得到了結果檢測外鍵。 有什麼方法可以檢測表格的父母和孩子嗎？因爲我們需要在用戶界面中顯示它。謝謝

Answer 1

你有沒有嘗試這個辦法：

SELECT 
    FK.referenced_table_name parent_table, 
    FK.table_name child_table, 
    FK.constraint_name as FK_name 
FROM 
    information_schema.KEY_COLUMN_USAGE FK 
WHERE 
    FK.referenced_table_name IS NOT NULL 

編號：http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html