Redis的事务操作的命令与执行操作（代码）

序

本文主要研究一下redis的事务操作

命令

multi与exec

127.0.0.1:6379> multi
OK
127.0.0.1:6379> incr total
QUEUED
127.0.0.1:6379> incr len
QUEUED
127.0.0.1:6379> exec
1) (integer) 2
2) (integer) 2
127.0.0.1:6379> get total
"2"
127.0.0.1:6379> get len
"2"

 @Test
 public void testMultiExec(){
 RedisClient client = 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]]
 TransactionResult transactionResult = syncCommands.exec();
 System.out.println(transactionResult);
 System.out.println(syncCommands.get("hello"));
 System.out.println(syncCommands.get("world"));
 }

部分执行

127.0.0.1:6379> multi
OK
127.0.0.1:6379> set a hello
QUEUED
127.0.0.1:6379> set b world
QUEUED
127.0.0.1:6379> incr a
QUEUED
127.0.0.1:6379> set c part
QUEUED
127.0.0.1:6379> exec
1) OK
2) OK
3) (error) ERR value is not an integer or out of range
4) OK
127.0.0.1:6379> get a
"hello"
127.0.0.1:6379> get b
"world"
127.0.0.1:6379> get c
"part"

 @Test
 public void testMultiExecError(){
 RedisClient client = 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: ERR value is not an integer or out of range, OK, 1]]
 TransactionResult transactionResult = 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

127.0.0.1:6379> set sum 1
OK
127.0.0.1:6379> multi
OK
127.0.0.1:6379> incr sum
QUEUED
127.0.0.1:6379> discard
OK
127.0.0.1:6379> get sum
"1"

 @Test
 public void testMultiDiscard(){
 RedisClient client = 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OK
 String result = syncCommands.discard();
 System.out.println(result);
 System.out.println(syncCommands.get("key1"));
 }

check and set

 @Test
 public void testWatch(){
 RedisClient client = RedisClient.create("redis://192.168.99.100:6379/0");
 StatefulRedisConnection<String, String> connection = client.connect();
 RedisCommands<String, String> syncCommands = connection.sync();

 String key = "key";
 syncCommands.watch(key);

 //another connection
 StatefulRedisConnection<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]
 TransactionResult transactionResult = syncCommands.exec();
 System.out.println(transactionResult);

 System.out.println(syncCommands.get(key));
 }

小结