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    Expert tip

    MySQL doesn't support some types of characters (such as emojis) with the utf8 encoding. You need to be on MySQL 5.5+ and force utf8mb4 (everywhere, client and server). You can do this sending the query "SET NAMES utf8mb4". Check this

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    Make sure you are using InnoDB storage engine and READ-COMMITTED transaction isolation level and increase the database server innodb_lock_wait_timeout variable to about 500.

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via GitHub by Shannon1
, 1 year ago
(? , ? , ? , ?) on duplicate key update `username`=values(`username`) , `phone`=values(`phone`) , `mail`=values(`mail`) , `id`=values(`id`)]; SQL state [3D000]; error code [1046]; No database selected; nested exception is java.sql.BatchUpdateException: No database selected
java.sql.SQLException: No database selected	at com.mysql.jdbc.SQLError.createSQLException(	at com.mysql.jdbc.MysqlIO.checkErrorPacket(	at com.mysql.jdbc.MysqlIO.checkErrorPacket(	at com.mysql.jdbc.MysqlIO.sendCommand(	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(	at com.mysql.jdbc.ConnectionImpl.execSQL(	at com.mysql.jdbc.PreparedStatement.executeInternal(	at com.mysql.jdbc.PreparedStatement.executeUpdate(	at com.mysql.jdbc.PreparedStatement.executeUpdate(	at com.mysql.jdbc.PreparedStatement.executeUpdate(	at com.mysql.jdbc.PreparedStatement.executeBatchedInserts(	at com.mysql.jdbc.PreparedStatement.executeBatch(	at org.apache.commons.dbcp.DelegatingStatement.executeBatch(	at org.apache.commons.dbcp.DelegatingStatement.executeBatch(	at org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(	at org.springframework.jdbc.core.JdbcTemplate$4.doInPreparedStatement(	at org.springframework.jdbc.core.JdbcTemplate.execute(	at org.springframework.jdbc.core.JdbcTemplate.execute(	at org.springframework.jdbc.core.JdbcTemplate.batchUpdate(	at$DbLoadWorker$1.doInTransaction(	at	at$DbLoadWorker.doCall(	at$	at$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at