小编给大家分享一下Redis中事务操作的命令有哪些，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

命令

命令行

127.0.0.1:6379>multiOK127.0.0.1:6379>incrtotalQUEUED127.0.0.1:6379>incrlenQUEUED127.0.0.1:6379>exec1)(integer)22)(integer)2127.0.0.1:6379>gettotal"2"127.0.0.1:6379>getlen"2"

lettuce实例

@TestpublicvoidtestMultiExec(){RedisClientclient=RedisClient.create("redis://192.168.99.100:6379/0");StatefulRedisConnection<String,String>connection=client.connect();RedisCommands<String,String>syncCommands=connection.sync();syncCommands.set("hello","1");syncCommands.set("world","2");syncCommands.multi();syncCommands.incr("hello");syncCommands.incr("world");//DefaultTransactionResult[wasRolledBack=false,result=[1,2,1,3,1]]TransactionResulttransactionResult=syncCommands.exec();System.out.println(transactionResult);System.out.println(syncCommands.get("hello"));System.out.println(syncCommands.get("world"));}部分执行

命令行

127.0.0.1:6379>multiOK127.0.0.1:6379>setahelloQUEUED127.0.0.1:6379>setbworldQUEUED127.0.0.1:6379>incraQUEUED127.0.0.1:6379>setcpartQUEUED127.0.0.1:6379>exec1)OK2)OK3)(error)ERRvalueisnotanintegeroroutofrange4)OK127.0.0.1:6379>geta"hello"127.0.0.1:6379>getb"world"127.0.0.1:6379>getc"part"

lettuce实例

@TestpublicvoidtestMultiExecError(){RedisClientclient=RedisClient.create("redis://192.168.99.100:6379/0");StatefulRedisConnection<String,String>connection=client.connect();RedisCommands<String,String>syncCommands=connection.sync();syncCommands.multi();syncCommands.set("a","hello");syncCommands.set("b","world");syncCommands.incr("a");syncCommands.set("c","part");//DefaultTransactionResult[wasRolledBack=false,result=[OK,OK,io.lettuce.core.RedisCommandExecutionException:ERRvalueisnotanintegeroroutofrange,OK,1]]TransactionResulttransactionResult=syncCommands.exec();System.out.println(transactionResult);System.out.println(syncCommands.get("a"));System.out.println(syncCommands.get("b"));System.out.println(syncCommands.get("c"));}multi与discard

命令行

127.0.0.1:6379>setsum1OK127.0.0.1:6379>multiOK127.0.0.1:6379>incrsumQUEUED127.0.0.1:6379>discardOK127.0.0.1:6379>getsum"1"

lettuce实例

@TestpublicvoidtestMultiDiscard(){RedisClientclient=RedisClient.create("redis://192.168.99.100:6379/0");StatefulRedisConnection<String,String>connection=client.connect();RedisCommands<String,String>syncCommands=connection.sync();syncCommands.incr("key1");syncCommands.multi();syncCommands.incr("key1");//需要有multi才可以执行discard，成功返回OKStringresult=syncCommands.discard();System.out.println(result);System.out.println(syncCommands.get("key1"));}check and set

@TestpublicvoidtestWatch(){RedisClientclient=RedisClient.create("redis://192.168.99.100:6379/0");StatefulRedisConnection<String,String>connection=client.connect();RedisCommands<String,String>syncCommands=connection.sync();Stringkey="key";syncCommands.watch(key);//anotherconnectionStatefulRedisConnection<String,String>conn2=client.connect();RedisCommands<String,String>syncCommands2=conn2.sync();syncCommands2.set(key,"a");syncCommands.multi();syncCommands.append(key,"b");//DefaultTransactionResult[wasRolledBack=true,responses=0]TransactionResulttransactionResult=syncCommands.exec();System.out.println(transactionResult);System.out.println(syncCommands.get(key));}

reids提供multi exec/discard指令，类似open commit/rollback transaction，不过exec遇到类型操作等错误时不会滚，该成功执行的命令还是成功执行，该失败的还是失败

multi exec保证的是，只要exec命令有执行成功，则事务中一系列的命令都能执行，如果exec因为网络等问题，server端没有接收到，则事务中的一系列命令都不会被执行

discard需要在有调用multi的前提下才能使用，该命令会清空事务队列等待执行的命令

redis提供watch指令，可以配合multi exec来使用，可以实现类似数据库的乐观锁的机制，一旦watch的key被其他client有更新，则整个exec操作失败

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