![]() ![]() Update FantasyMatchContestsV2 c set points = (points + 124), lastUpdatedTime=1555161797491 where c.viceCaptainId=127 and c.matchId=40288 and c.contestType=0 and c.userBucket=0, Update FantasyMatchContestsV2 c set points = (points + 248), lastUpdatedTime=1555161797491 where c.captainId=127 and c.matchId=40288 and c.contestType=0 and c.userBucket=0, KEY `matchIdContestTypeUserBucket` (`matchIdContestTypeUserBucket`),īatch statements which are being executed by 10 threads, each thread will execute different contest type (from 1 to 10) update FantasyMatchContestsV2 c inner join FantasyMatchUserPlayersV2 p on c.matchId = p.matchId AND c.userId = p.userId AND c.contestType= p.contestType AND c.userBucket = p.userBucket set c.points = (c.points + 124), c.lastUpdatedTime=1555161797491 where p.playerId=127 AND p.matchId=40288 AND p.contestType=0 and p.userBucket=0, UNIQUE KEY `userId` (`userId`,`matchIdContestTypeUserBucket`), ![]() `matchIdContestTypeUserBucket` varchar(255) DEFAULT NULL, Table 2 schema - CREATE TABLE `FantasyMatchContestsV2` ( KEY `matchId_playerId_contestType` (`matchIdPlayerIdContestType`), KEY `matchId_playerId_contestType_userBucket` (`matchIdPlayerIdContestTypeUserBucket`), `matchIdPlayerIdContestTypeUserBucket` varchar(255) DEFAULT NULL, `matchIdPlayerIdContestType` varchar(255) DEFAULT NULL, ![]() Table 1 schema - CREATE TABLE `FantasyMatchUserPlayersV2` ( : Deadlock found when trying to get lock try restarting transactionĪt .executeBatch(StatementImpl.java:1046)Īt .executeBatch(StatementHandle.java:469) The below example shows batch update using the statement.I've two tables of innoDB type and I'm updating one table using batch statement from 10 thread (one batch statement per thread) but some time I'm getting dead lock. We cannot remove specific statements using clearBatch method it will delete all the statements from the batch.īelow are the examples which are as follows.This method is used to remove all the statement which was added in batch. We can remove the update statement from the batch using clearBatch() method.Below steps shows how to execute the batch using statement object are as follows.ġ) Create the object of statement using createStatement() method.ģ) Add multiple update statement using addBatch() method.Ĥ) Execute all update statements using executeBatch() method.ĥ) After all execution commits all the changes which was we have done using batch update.Execute batch method is returning the integer of arrays, also it will returning each element of the array.This method is used to start the execution of all update statements in the JDBC batch update method. Execute batch method is used to execute all the statement groups together.This method will add multiple single update statements into the batch. Basically, add batch method is used to add a single statement into the batch.There are two methods used to update multiple statements in the batch.Using PreparedStatemente we can use the PreparedStatement object for the execution of batch update on the database server.Using statement we can use the statement object for the execution of batch update on the database server.Using batch database is executing the update operations in parallel, the execution speed of batch update as compared to one by one updation is high.īatch update will take less time to update the statement as compared to one-by-one statement update.We can execute batch update operations using PreparedStatement in JDBC. We can execute multiple update statements using this method.ĥ) Prepared Statement – This statement is used to execute the statement. To perform the batch update operations we need to add SQL statement in the batch.Ĥ) Execute batch – This method is used to execute the batch update. It will add the data in the batch file after adding in the batch it will process to the database server for execution.ģ) Statement – This method is used to execute the batch update operation in java. tString (value, value) ġ) Connection String – It contains the information of username, password, hostname & port of the database server.Ģ) Add batch – This method is used to execute the statement in the batch. PreparedStatement = con_object.prepareStatement (update query) PreparedStatement Prp_stmt_object = null Statement stmt_object = con_object.createStatement () Ģ) JDBC transaction using Prepared statement – public static void main /* main method */ (string args ) 1) JDBC transaction using simple statement – public static void main /* main method */ (string args )Ĭonnection con_object DriverManager.getConnection ("connection string") ![]()
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