程序包 com.mysql.cj.xdevapi

接口 FetchResult<T>

类型参数:

T - the type of element returned from the query (doc or row)

所有超级接口:

Iterable<T>, Iterator<T>

所有已知子接口:

DocResult, RowResult, SqlResult

所有已知实现类:

DocResultImpl, RowResultImpl, SqlMultiResult, SqlSingleResult, SqlUpdateResult

public interface FetchResult<T>
extends Iterator<T>, Iterable<T>

A set of elements from a query command.

方法概要

修饰符和类型	方法	说明
long	count()	How many items are in this result?
List<T>	fetchAll()	Create a list of all elements in the result forcing internal buffering.
default T	fetchOne()	Fetch the next element.
default boolean	hasData()	Does this result have data?
default Iterator<T>	iterator()	Create an iterator over all elements of the result.

从接口继承的方法 java.lang.Iterable

forEach, spliterator

从接口继承的方法 java.util.Iterator

forEachRemaining, hasNext, next, remove

方法详细资料

hasData

default boolean hasData()

Does this result have data? This indicates that the result was produced from a data-returning query. It does not indicate whether there are more than 0 rows in the result.

返回:

true if has data

fetchOne

default T fetchOne()

Fetch the next element.

返回:

element of type T

iterator

default Iterator<T> iterator()

Create an iterator over all elements of the result.

指定者:

iterator 在接口中 Iterable<T>

返回:

iterator over result items

count

long count()

How many items are in this result? This method forces internal buffering of the entire result.

返回:

number of elements in result

fetchAll

List<T> fetchAll()

Create a list of all elements in the result forcing internal buffering.

返回:

list of result elements