Tile38空间数据库操作命令之删除操作

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DEL语法

DEL key id

删除指定的对象。

  • 示例：

    127.0.0.1:9851> SET fleet truck1 POINT 116.578497 39.868634
{"ok":true,"elapsed":"17.493µs"}
​
127.0.0.1:9851> GET fleet truck1
{"ok":true,"object":{"type":"Point","coordinates":[39.868634,116.578497]},"elapsed":"14.437µs"}
​
127.0.0.1:9851> DEL fleet truck1
{"ok":true,"elapsed":"11.662µs"}
​
127.0.0.1:9851> GET fleet truck1
(error) id not found

    1.我们先设置一个id=truck1的POINT数据；

    2.通过查询语句可以确定我们设置好的数据；

    3.通过DEL删除数据；

    4.通过GET确定是否真的被删除；

JDEL语法

JDEL key id path

JDEL命令用来操作JSON文档的，它可以根据提供的path来删除JSON文档里面的数据；

  • 示例：

    127.0.0.1:9851> JSET user 901 name.first Tom
{"ok":true,"elapsed":"53.761µs"}
127.0.0.1:9851> JSET user 901 name.last Anderson
{"ok":true,"elapsed":"33.783µs"}
​
127.0.0.1:9851> JGET user 901
{"ok":true,"value":"{"name":{"first":"Tom","last":"Anderson"}}","elapsed":"26.67µs"}
​
127.0.0.1:9851> JDEL user 901 name.last
{"ok":true,"elapsed":"68.749µs"}
​
127.0.0.1:9851> JGET user 901
{"ok":true,"value":"{"name":{"first":"Tom"}}","elapsed":"16.942µs"}

    1.通过JSET创建JSON文档{"name":{"first":"Tom"}}；

    2.通过JSET给文档添加last字段：{"name":{"first":"Tom","last":"Anderson"}}；

    3.JGET查询确定添加后的结果；

    4.通过JDEL命令删除文档中的指定字段name.last；

    5.查询删除后的结果：`{"name":{"first":"Tom"}}；

PDEL语法

PDEL key pattern

PDEL使用正则表达式来匹配id字段来删除目标数据；

  • 示例：

    127.0.0.1:9851> SET fleet truck1 POINT 116.582268 39.867757
{"ok":true,"elapsed":"22.141µs"}
127.0.0.1:9851> SET fleet hello POINT 116.577703 39.867514
{"ok":true,"elapsed":"16.842µs"}
127.0.0.1:9851> SET fleet truco POINT 116.578497 39.868634
{"ok":true,"elapsed":"14.938µs"}
​
127.0.0.1:9851> SCAN fleet
{"ok":true,"objects":[{"id":"hello","object":{"type":"Point","coordinates":[39.867514,116.577703]}},{"id":"truck1","object":{"type":"Point","coordinates":[39.867757,116.582268]}},{"id":"truco","object":{"type":"Point","coordinates":[39.868634,116.578497]}}],"count":3,"cursor":0,"elapsed":"74.791µs"}
​
127.0.0.1:9851> PDEL fleet truc*
{"ok":true,"elapsed":"14.978µs"}
​
127.0.0.1:9851> SCAN fleet
{"ok":true,"objects":[{"id":"hello","object":{"type":"Point","coordinates":[39.867514,116.577703]}}],"count":1,"cursor":0,"elapsed":"81.773µs"}

    1.SET命令先准备好数据；

    2.通过SCAN命令确定数据没有问题，一共是三个点位的数据；

    3.通过PDEL删除id以truc开头的数据；

    4.通过SCAN命令查看删除后的结果，最后只剩下一个点位的数据；

DELCHAN语法

DELCHAN name

删除指定的频道；这个所谓的频道就是用来接收相关事件的，发布到频道上面的事件可以被客户端订阅消费；

  • 示例：

    127.0.0.1:9851> SETCHAN warehouse NEARBY fleet FENCE POINT 33.5123 -112.2693 500
{"ok":true,"elapsed":"78.688µs"}
​
127.0.0.1:9851> CHANS warehouse
{"ok":true,"chans":[{"name":"warehouse","key":"fleet","ttl":-1,"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"16µs"}
​
127.0.0.1:9851> DELCHAN warehouse
{"ok":true,"elapsed":"20.719µs"}
​
127.0.0.1:9851> CHANS warehouse
{"ok":true,"chans":[],"elapsed":"6.362µs"}

    1.先通过SETCHAN命令创建一个warehouse名称的频道；目标点500米范围内的，fleet中的任何数据对象在该范围内有变动，都会把相关事件发送到该频道；

    2.CHANS命令确定创建的频道没有问题；

    3.使用DELCHAN删除warehouse频道；

    4.确定warehouse频道删除成功；

PDELCHAN语法

PDELCHAN pattern

有了前面的经验，这个命令我们就很容易就猜出来了：根据正则表达式来删除目标频道。

  • 示例：

    127.0.0.1:9851> SETCHAN warehouse NEARBY fleet FENCE POINT 33.5123 -112.2693 500
{"ok":true,"elapsed":"78.688µs"}
127.0.0.1:9851> SETCHAN house NEARBY fleet FENCE POINT 33.5123 -112.2693 500
{"ok":true,"elapsed":"88.075µs"}
​
127.0.0.1:9851> CHANS warehouse
{"ok":true,"chans":[{"name":"warehouse","key":"fleet","ttl":-1,"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"16µs"}
127.0.0.1:9851> CHANS house
{"ok":true,"chans":[{"name":"house","key":"fleet","ttl":-1,"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"23.494µs"}
​
127.0.0.1:9851> PDELCHAN ware*
{"ok":true,"elapsed":"20.719µs"}
​
127.0.0.1:9851> CHANS warehouse
{"ok":true,"chans":[],"elapsed":"6.362µs"}
127.0.0.1:9851> CHANS house
{"ok":true,"chans":[{"name":"house","key":"fleet","ttl":-1,"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"23.494µs"}

    1.先通过SETCHAN命令创建一个warehouse名称的频道；目标点500米范围内的，fleet中的任何数据对象在该范围内有变动，都会把相关事件发送到该频道；

    2.另外再创建一个house频道；

    2.CHANS命令确定创建的频道没有问题；

    3.使用PDELCHAN删除名称以ware开头的频道；

    4.确定名称以ware开头的频道删除成功；

    5.CHANS查看house频道还存在；

DELHOOK语法

DELHOOK name

和CHAN一样，HOOK是另外一种形式的监测形式，HOOK就是指定一个目标回调接口，有任何的事件都调用这个目标接口。

  • 示例：

    127.0.0.1:9851> SETHOOK warehouse http://10.0.20.78/endpoint NEARBY fleet FENCE POINT 33.5123 -112.2693 500
{"ok":true,"elapsed":"104.456µs"}
​
127.0.0.1:9851> HOOKS warehouse
{"ok":true,"hooks":[{"name":"warehouse","key":"fleet","ttl":-1,"endpoints":["http://10.0.20.78/endpoint"],"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"23.033µs"}
​
127.0.0.1:9851> DELHOOK warehouse
{"ok":true,"elapsed":"31.941µs"}
​
127.0.0.1:9851> HOOKS warehouse
{"ok":true,"hooks":[],"elapsed":"24.506µs"}

    1.通过SETHOOK创建一个warehouse为名称的HOOK；

    2.查询warehouse HOOK创建成功；

    3.删除warehouse HOOK；

    4.查询是否还存在warehouse HOOK；

PDELHOOK语法

PDELHOOK pattern

PDELHOOK很明确，就是通过正则表达式来删除目标HOOK；

  • 示例：

    127.0.0.1:9851> SETHOOK warehouse http://10.0.20.78/endpoint NEARBY fleet FENCE POINT 33.5123 -112.2693 500
{"ok":true,"elapsed":"104.456µs"}
127.0.0.1:9851> SETHOOK house http://127.0.0.1/endpoint NEARBY fleet FENCE POINT 33.5123 -112.2693 500
{"ok":true,"elapsed":"98.134µs"}
​
127.0.0.1:9851> HOOKS warehouse
{"ok":true,"hooks":[{"name":"warehouse","key":"fleet","ttl":-1,"endpoints":["http://10.0.20.78/endpoint"],"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"23.033µs"}
127.0.0.1:9851> HOOKS house
{"ok":true,"hooks":[{"name":"house","key":"fleet","ttl":-1,"endpoints":["http://127.0.0.1/endpoint"],"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"23.904µs"}
​
127.0.0.1:9851> PDELHOOK ware*
{"ok":true,"elapsed":"31.941µs"}
​
127.0.0.1:9851> HOOKS warehouse
{"ok":true,"hooks":[],"elapsed":"24.506µs"}
127.0.0.1:9851> HOOKS house
{"ok":true,"hooks":[{"name":"house","key":"fleet","ttl":-1,"endpoints":["http://127.0.0.1/endpoint"],"command":["NEARBY","fleet","FENCE","POINT","33.5123","-112.2693","500"],"meta":{}}],"elapsed":"23.904µs"}

    1.通过SETHOOK创建两个不同的HOOK，一个名称叫warehouse，一个叫house；

    2.确定两个HOOK都创建成功，没有问题；

    3.通过PDELHOOK命令删除以ware开头的HOOK；

    4.再次查看，发现warehouse被删除，而house作为名称的HOOK没有被删除；

PERSIST语法

PERSIST key id

删除指定id数据对象里面的超时设置，也就是EX配置；执行PERSIST后，目标id对应的TTL字段值为-1；

  • 示例：

    127.0.0.1:9851> SET fleet time EX 10 POINT 116.578497 39.868634
{"ok":true,"elapsed":"17.873µs"}
​
127.0.0.1:9851> TTL fleet time
{"ok":true,"ttl":7.895136745,"elapsed":"8.877µs"}
​
127.0.0.1:9851> PERSIST fleet time
{"ok":true,"elapsed":"5.51µs"}
​
127.0.0.1:9851> TTL fleet time
{"ok":true,"ttl":-1,"elapsed":"4.709µs"}

    1.先创建一个带有EX属性的time名称的数据对象；

    2.使用TTL命令确定剩余的过期时间；

    3.使用PERSIST删除time的EX配置；

    4.再次查看过期时间，已经变为-1；

DROP语法

DROP key

DROP直接删除一组数据对象;

  • 示例：

    127.0.0.1:9851> SET fleet truck1 POINT 116.578497 39.868634
127.0.0.1:9851> SET fleet truck2 POINT 116.577703 39.867514
​
127.0.0.1:9851> SCAN fleet
{"ok":true,"objects":[{"id":"truck1","object":{"type":"Point","coordinates":[39.868634,116.578497]}},{"id":"truck2","object":{"type":"Point","coordinates":[39.867514,116.577703]}}],"count":2,"cursor":0,"elapsed":"81.944µs"}
​
127.0.0.1:9851> DROP fleet
{"ok":true,"elapsed":"9.067µs"}
​
127.0.0.1:9851> SCAN fleet
{"ok":true,"objects":[],"count":0,"cursor":0,"elapsed":"12.604µs"}

    1.先在fleet中创建两个点位truck1、truck2；

    2.SCAN命令确定fleet中的点位都创建成功；

    3.使用DROP命令删除fleet；

    4.确定删除操作成功；

FLUSHDB语法

FLUSHDB

删除所有的键，该操作不需要带任何参数；其实就是清空数据库。

【注意】：这个命令将删除所有的数据。

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