CREATE TABLE 入库信息 (入库编号 INTEGER PRIMARY KEY, 入库日期 SMALLDATETIME, 操作人员编号 INTEGER, CONSTRAINT FK_操作人员编号 FOREIGN KEY(操作人员编号) REFERENCES 操作人员信息(操作人员编号) ) 5.CHECK约束 在完整性约束图中我们可以看出,CHECK约束可以被定义为表约束、列约束、域约束,或者被定义在断言中。...
DECLARE @Next INTEGER BEGIN TRANSACTION -- 找到下一个满足条件的值 SELECT TOP 1 @Next = Id FROM Test WITH (UPDLOCK, READPAST) WHERE Flag = 0 ORDER BY Id ASC --若找到利用标识更新,防止下一次被读取到 IF (@Next IS NOT NULL) BEGIN UPDATE Test SET Flag = 1 WHERE Id = @Next END COMMI...
主键:主键是一种唯一性索引,但它必须指定为“PRIMARY KEY”。如果你曾经用过AUTO_INCREMENT类型的列,你可能已经熟悉主键之类的概念了。 主键一般在创建表的时候指定,例如“CREATE TABLE tablename ([...], PRIMARY KEY (列的列表) ); ”。 但是,我们也可以通过修改表的方式加入主键,例如“ALTER TABLE tablename...
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id integer primary key, name varchar2(100), salary integer ); truncate table test_sj_salary; insert into test_sj_salary (ID, NAME, SALARY) values (1, '张三', 5000); commit; 三种方法的演示 declare v_salary integer; begin --通过异常方式处理找不到数据 ...
asArray,asBinary,asBoolean,asDouble,asEnum,asFixedBinary,asFloat,asIndexKey,asInteger,asLong,asMap,asPrimaryKey,asRecord,asRow,asString,getType,isArray,isBinary,isBoolean,isDouble,isEnum,isFixedBinary,isFloat,isIndexKey,isInteger,isLong,isMap,isNull,isPrimaryKey,isRecord,isRow,isString,toJsonStr...
SET FOREIGN_KEY_CHECKS=1; 二POM 简单说一下: 1 jackson-datatype-hibernate5 懒加载数据,转换json时,避免错误。 2 其他不赘述了。 <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> ...
$this->createTable('{{%group}}', [ 'id' => $this->primaryKey(), 'name' => $this->string()->comment('Наименованиегруппы'), 'parent_id' => $this->integer()->comment('Родительскаягруппа'), 'accounting_id' => $this->string()-...
(String id, boolean isComplete) { todoItemMap.get(id).setComplete(isComplete); return todoItemMap.get(id); } @Override public boolean deleteTodoItem(@NonNull String id) { todoItemMap.remove(id); return true; } private String generateId() { return new Integer(todoItemMap.size())....
// Create a table ExecutionFuture future = null; try { future = tableAPI.execute ("CREATE TABLE users (" + "id INTEGER, " + "firstName STRING, " + "lastName STRING, " + "age INTEGER, " + "PRIMARY KEY (id))"); } catch (IllegalArgumentException e) { System.out.println("The ...