01. public boolean truncateTable(String table) { 02. boolean isTruncated = false; 03. try { 04. PreparedStatement ps = this.connection.prepareStatement("TRUNCATE "+table); 05. System.out.println("Statement : "+ps.toString()); 06. isTruncated = ps.execute(); 07. } catch (SQL...
However, in some cases, the MySQL TRUNCATE TABLE statement is more efficient than the DELETEstatement. The syntax of the MySQL TRUNCATE TABLE statement is as follows: 1 TRUNCATE TABLE table_name; You specify the table name, which you want to remove all data, after the TRUNCATE TABLE clause...
2. 3. 使用TRUNCATE TABLE 如果只是希望清空表中的数据而不是删除整个表,可以考虑使用TRUNCATE TABLE语句。TRUNCATE TABLE会更快速地清空表中的数据,但不会触发DELETE操作的触发器和日志。 TRUNCATE TABLE table_name; 1. 4. 优化表结构 如果表结构设计不合理或者存在大量冗余数据,也可能导致删除操作变慢。在这种情...
Truncate operations drop and re-create the table, which is much faster than deleting rows one by one, particularly for large tables. Truncate operations cause an implicit commit, and so cannot be rolled back. SeeSection 15.3.3, “Statements That Cause an Implicit Commit”. ...
DROP TABLE Syntax DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name] ... [RESTRICT | CASCADE] 可一次删除一张或多张表。需具有所删除表上的DROP权限。 表定义文件和数据文件均被移除。表被删除后表上的用户权限不会被自己主动删除。
To create a temporary table based on the definition of such a table, use this syntax instead: CREATE TEMPORARY TABLE new_tbl SELECT * FROM orig_tbl LIMIT 0;Note Support for TABLESPACE = innodb_file_per_table and TABLESPACE = innodb_temporary clauses with CREATE TEMPORARY TABLE is ...
It is clearly documented (in "13.2.9. TRUNCATE Syntax" section of the manual): "Truncate operations drop and re-create the table, which is much faster than deleting rows one by one." Surely you can not drop LOCKed table, hence the error message. So, I think, it is not a bug, but...
(HY000): Incorrect string value: '/xC0/xEE/xCB/xC4' for column 'usern ame' at row 1 因为表中已经有数据,所以更改username字符集的操作没有成*** 清空users表中的数据 mysql> truncate table users; Query OK, 3 rows affected (0.01 sec) 从新更改user表中username的字符集 mysql> alter table ...
可以使用TRUNCATE TABLE来清空日志记录。 可以使用RENAME TABLE来实现日志表的归档,新旧表做一个原子的名称互换操作,如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 use mysql;DROPTABLEIFEXISTSgeneral_log2;CREATETABLEgeneral_log2LIKEgeneral_log;RENAMETABLEgeneral_logTOgeneral_log_backup,general_log2...
but when I run the following code, MySQL Error 1064 (syntax error) is generated. 01. public boolean truncateTable(String table) { 02. boolean isTruncated = false; 03. try { 04. PreparedStatement ps = this.connection.prepareStatement("TRUNCATE ?"); ...