逻辑上我们需要怎么写: result = mysql_query(‘select * from xxx where id = 1’);row = mysql_fetch_assoc( 但是这样写有两个问题...1、效率太差,每次执行都要执行2个sql 2、高并发的情况下数据会出问题,不能保证原子性 还好MySQL 为我们解决了这个问题:我们可以通过 ON DUPLICATE KEY UPDATE 达到以上...
Failed to execute query: Duplicate entry '0' for key 'PRIMARY' 今天在做php登陆和登出会插入数据到log表中,,结果报错了:如下: Failed to execute query: Duplicate entry '0' for key 'PRIMARY' SQL: INSERT INTO log set LOGID = 'IN', LOG01 ='test', LOG02 ='127.0.0.1', DT999 = now() ...
Adding results of SQL query to an iEnumerable string adding scrollbar to dropdownlist Adding values inside the datatable to a Dictionary in VB.net Adjust printing to fit sizes (A4 and PVC card sizes) Adobe PDF Reader under 'COM' tab ,dont add anything to my toolbox Advantages of URL rewri...
mysql tables in use 1, locked 1 LOCK WAIT 3 lock struct(s), heap size 1136, 2 row lock(s), undo log entries 1 MySQL thread id 23, OS thread handle 14896, query id 582 localhost ::1 root update insert into song_rank(songId,weight) values(18,100) on duplicate key update weight=...
And one more catch: If you yould SET FILTER TO something in your workareas RAC2,3,4 this'll not effect the query result. SQL will always go from newly opeend DBF(alias) anyway, unless you use the new WITH SqlBuffering option, then it'll read from the buffered changes of a workarea...
Query OK,0rows affected (0.00sec) mysql>insertintosong_rank(songId,weight)values(18,100)onduplicatekeyupdateweight=weight+1;//第六步 事务一,事务二,事务三执行: 死锁浮出水面: ERROR1213(40001): Deadlock foundwhentryingtoget lock; try restartingtransaction ...
java.sql.SQLException: Duplicate entry'1300'forkey 'PRIMARY'at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readErrorPacket(AbstractQueryProtocol.java:1681) ~[mariadb-java-client-2.7.2.jar!/:na] at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket(AbstractQueryProtocol.ja...
In this situation, when you query data from this external table, duplicate rows may be returned. Resolution This issue is fixed in the following cumulative updates for SQL Server: Cumulative Update 1 for SQL Server 2017 Cumulative Update 6 for SQL Server 2016 RTM Cumulative Update 6 ...
In the Property window, clickDistinct valuesand set the value toYes. The Query and View Designer inserts the keyword DISTINCT in front of the list of display columns in the SQL statement. Note If you use the DISTINCT keyword you may not be able to modify the result set in the results pa...
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073) ...