09 2004 档案

摘要:oracle: OracleConnectionOcon=newOracleConnection("userid=cmes;datasource=mes;password=cmes"); OracleCommandOcom=newOr... 阅读全文
posted @ 2004-09-28 13:20 Enli 阅读(1962) 评论(0) 推荐(0) 编辑
摘要:Understanding Relationship Existence Existence describes the relationship between a pair of entities from the perspective of the child entity. Fundamentally, it asks the question, "Is a foreign key... 阅读全文
posted @ 2004-09-09 11:58 Enli 阅读(520) 评论(0) 推荐(0) 编辑
摘要:Understanding Relationship Cardinality Cardinality describes the quantitative dimension in the relationship between a pair of entities as viewed from the perspective of the parent entity. Fundament... 阅读全文
posted @ 2004-09-09 11:56 Enli 阅读(955) 评论(0) 推荐(1) 编辑
摘要:Understanding Relationship Types DEF1X supports three relationship types: Identifying Non-Identifying Non-Specific The selection of relationship types is fundamental to the referential integri... 阅读全文
posted @ 2004-09-09 11:55 Enli 阅读(678) 评论(0) 推荐(0) 编辑

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