实体完整性约束 meaning in English

entity integrity constraint

Entity integrity constraints , referential integrity constraints , and user - defined most intergrity constraints of relational database were all preserved after the conversion
转换过程可保留关系数据库的实体完整性约束、参照完整性约束和绝大部分的用户自定义完整性约束。
Might indicate a system - level problem cannot make a connection to the database , a logical problem no more rows in the result set , or a problem with the specific data the primary key for the row you just tried to insert already exists or violates an entity integrity constraint
可能指示一个系统级问题（不能连接到数据库）、逻辑问题（在结果集中没有更多的行）或者特定数据的问题（您刚才试图插入行的主键已经存在或者违反实体完整性约束）。