ORACLE隐式重复FETCH，直到使用了来自游标的所有行并将每一行存储在阵列的一个元素中。
ORACLE implicitly repeats the FETCH until all the rows from the cursor are consumed and stores each row in an element of the array.
可持有结果集允许应用程序在隐式或显式提交之后一直将游标打开着。
A holdable result set permits an application to keep the cursor open after implicit or explicit commits.
在执行for语句时，游标被隐式声明，这样对于FOR循环的每一次迭代，取回的下一行就是结果集。
When a for statement is executed, a cursor is implicitly declared such that for each iteration of the for loop, the next row is the result set if fetched.
在LOAD命令中提供相应的select语句，就会隐式地定义游标。
Instead the cursor definition is implicitly done by providing the corresponding SELECT statement within the LOAD command.
在LOAD命令中提供相应的select语句，就会隐式地定义游标。
Instead the cursor definition is implicitly done by providing the corresponding SELECT statement within the LOAD command.
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