Question

lua 中有快速清空table的函数或者方法没

Answer 1

直接
tablename=nil
或者
tablename={}

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清空的意思是把表里的所有东东都清空吧？ 直接={}就行。

关于内存占用这个问题不用担心，lua的垃圾回收机制会在下次gc时把引用计数为0（就是原先）的table在内存中自动清除。

Answer 2

LUA – Array commands

LUA – Array commands example
[edit]
Clear table command

You can easily clear a complete table with the Clear() command.

local table = q.GetTable("TableName")
table:Clear()

This deletes all rows of all columns in an array table
[edit]
Erase command

With the Erase() command you can erase a column or a row.
[edit]
Erase column

With the Erase() command you can erase a column.

local table = q.GetTable("TableName")
local column = table:GetColumn("ColumnName")

column:Erase()

This erases all row in of one column in a table
[edit]
Erase row

With the Erase() command you can erase a column or a row.

local table = q.GetTable("TableName")
local row = table:GetRow(0)

row:Erase()

This erase all data in the row ID 0 of all column of a table. It does NOT remove-delete the row from the table, so it does not effect the total amount of rows!
[edit]
Delete command

With the Delete command you can delete-remove a row from all column in a table.

local table = q.GetTable("TableName")
local row = table:GetRow(0)

row:Delete()

This delelets the row ID 0 (and it data) from all columns in a table. This will affect the total amount of row in a table.