在一个命令中截断MySQL数据库中的所有表?
是否有一个查询(命令)可以在一次操作中截断数据库中的所有表?我想知道我是否可以通过一个查询来实现这一点。如果使用sql server 2005,则有一个隐藏的存储过程,允许您对数据库中的所有表执行一个或一组命令。以下是如何使用此存储过程调用在一个命令中截断MySQL数据库中的所有表?,mysql,Mysql,是否有一个查询(命令)可以在一次操作中截断数据库中的所有表?我想知道我是否可以通过一个查询来实现这一点。如果使用sql server 2005,则有一个隐藏的存储过程,允许您对数据库中的所有表执行一个或一组命令。以下是如何使用此存储过程调用TRUNCATE TABLE: EXEC [sp_MSforeachtable] @command1="TRUNCATE TABLE ?" 这是一篇很好的文章,可以进一步阐述 但是,对于MySql,您可以使用mysqldump并指定--add drop ta
TRUNCATE TABLE
:
EXEC [sp_MSforeachtable] @command1="TRUNCATE TABLE ?"
这是一篇很好的文章,可以进一步阐述
但是,对于MySql,您可以使用mysqldump并指定--add drop tables
和--no data
选项来删除和创建忽略数据的所有表。像这样:
mysqldump -u[USERNAME] -p[PASSWORD] --add-drop-table --no-data [DATABASE]
MS SQL Server 2005+(删除打印以便实际执行…)
如果您的数据库平台支持信息模式视图,则获取以下查询的结果并执行它们
SELECT 'TRUNCATE TABLE ' + TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
在MySQL上试试这个:
SELECT Concat('TRUNCATE TABLE ', TABLE_NAME) FROM INFORMATION_SCHEMA.TABLES
在Concat中添加分号使其更易于使用,例如在mysql工作台中
SELECT Concat('TRUNCATE TABLE ', TABLE_NAME, ';') FROM INFORMATION_SCHEMA.TABLES
一个想法可能是放下并重新创建表格 编辑: @乔纳森·莱夫勒:是的 其他建议(或在不需要截断所有表的情况下): 为什么不创建一个基本的存储过程来截断特定的表呢
CREATE PROCEDURE [dbo].[proc_TruncateTables]
AS
TRUNCATE TABLE Table1
TRUNCATE TABLE Table2
TRUNCATE TABLE Table3
GO
我不确定,但我认为有一个命令可以用来将数据库的模式复制到新数据库中,完成此操作后,可以删除旧数据库,然后可以再次将数据库模式复制到旧名称中。以下是一个应截断本地数据库中所有表的过程 如果它不起作用,请告诉我,我将删除此答案 未经测试
CREATE PROCEDURE truncate_all_tables()
BEGIN
-- Declare local variables
DECLARE done BOOLEAN DEFAULT 0;
DECLARE cmd VARCHAR(2000);
-- Declare the cursor
DECLARE cmds CURSOR
FOR
SELECT CONCAT('TRUNCATE TABLE ', TABLE_NAME) FROM INFORMATION_SCHEMA.TABLES;
-- Declare continue handler
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done=1;
-- Open the cursor
OPEN cmds;
-- Loop through all rows
REPEAT
-- Get order number
FETCH cmds INTO cmd;
-- Execute the command
PREPARE stmt FROM cmd;
EXECUTE stmt;
DROP PREPARE stmt;
-- End of loop
UNTIL done END REPEAT;
-- Close the cursor
CLOSE cmds;
END;
没有。没有一个命令可以一次截断所有mysql表。您必须创建一个小脚本来逐个截断表
参考:使用phpMyAdmin的方式如下: 数据库视图=>检查所有(表)=>空 如果要忽略外键检查,可以取消选中显示以下内容的框: []启用外键检查 您需要至少运行版本4.5.0或更高版本才能选中此复选框
这不是我的工作,但是,嘿,它工作了 我发现这样可以删除数据库中的所有表:
mysqldump -uUSERNAME -pPASSWORD --add-drop-table --no-data DATABASENAME | grep ^DROP | mysql -uUSERNAME -pPASSWORD DATABASENAME
如果您受到托管解决方案的限制(无法删除整个数据库),则此选项非常有用
我修改了它以截断表。mysqldump没有“-add truncate table”,所以我做了:
mysqldump -uUSERNAME -pPASSWORD --add-drop-table --no-data DATABASENAME | grep ^DROP | sed -e 's/DROP TABLE IF EXISTS/TRUNCATE TABLE/g' | mysql -uUSERNAME -pPASSWORD DATABASENAME
为我工作
--编辑,修复最后一个命令中的打字错误Drop(即删除表格)
截断(即空表)
我发现那个截断表。。即使在NOCHECK约束ALL之后,外键约束也有问题,所以我使用DELETE FROM语句代替。这并不意味着不会重置标识种子,您可以始终添加DBCC CHECKIDENT来实现这一点 在运行之前,我使用下面的代码将用于截断数据库中所有表的sql输出到消息窗口。这只会让犯错误变得更难
EXEC sp_MSforeachtable 'PRINT ''ALTER TABLE ? NOCHECK CONSTRAINT ALL'''
EXEC sp_MSforeachtable 'print ''DELETE FROM ?'''
EXEC sp_MSforeachtable 'print ''ALTER TABLE ? WITH CHECK CHECK CONSTRAINT all'''
SELECT CONCAT('ALTER TABLE ',TABLE_SCHEMA,'.',TABLE_NAME,' DROP FOREIGN KEY ',CONSTRAINT_NAME,';') FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS
WHERE CONSTRAINT_TYPE='FOREIGN KEY' AND TABLE_SCHEMA='<TABLE SCHEMA>'
UNION
SELECT CONCAT('TRUNCATE TABLE ',TABLE_SCHEMA,'.',TABLE_NAME,';') FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA='<TABLE SCHEMA>' AND TABLE_TYPE='BASE TABLE'
UNION
SELECT CONCAT('OPTIMIZE TABLE ',TABLE_SCHEMA,'.',TABLE_NAME,';') FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA='<TABLE SCHEMA>' AND TABLE_TYPE='BASE TABLE'
UNION
SELECT CONCAT('ALTER TABLE ',TABLE_SCHEMA,'.',TABLE_NAME,' ADD CONSTRAINT ',CONSTRAINT_NAME,' FOREIGN KEY(',COLUMN_NAME,')',' REFERENCES ',REFERENCED_TABLE_NAME,'(',REFERENCED_COLUMN_NAME,');') FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE CONSTRAINT_NAME LIKE 'FK%' AND TABLE_SCHEMA='<TABLE SCHEMA>'
INTO OUTFILE "C:/DB Truncate.sql" LINES TERMINATED BY '\n';
从INFORMATION_SCHEMA.TABLE_CONSTRAINTS中选择CONCAT('ALTER TABLE',TABLE_SCHEMA','。',TABLE_NAME',DROP FOREIGN KEY',CONSTRAINT_NAME',;')
其中约束类型为外键,表模式为“”
联合
从INFORMATION_SCHEMA.TABLES中选择CONCAT('TRUNCATE TABLE',TABLE_SCHEMA','.',TABLE_NAME',;')
其中,TABLE_SCHEMA=''和TABLE_TYPE='BASE TABLE'
联合
从INFORMATION_SCHEMA.TABLES中选择CONCAT('OPTIMIZE TABLE',TABLE_SCHEMA','.',TABLE_NAME',;')
其中,TABLE_SCHEMA=''和TABLE_TYPE='BASE TABLE'
联合
从信息_SCHEMA.KEY_COLUMN_USAGE中选择CONCAT('ALTER TABLE',TABLE_SCHEMA',','TABLE_NAME','ADD CONSTRAINT',CONSTRAINT_NAME','FOREIGN KEY(',COLUMN_NAME','),'REFERENCES',REFERENCED_TABLE_NAME',(',REFERENCED_COLUMN_NAME',);'))
其中约束_名称如“FK%”和表_模式=“”
插入文件“C:/DB Truncate.sql”中以“\n”结尾的行;
我知道这并不完全是一个命令,但可以通过以下步骤从phpMyAdmin内部实现所需的结果:
其思想是从数据库中快速获取所有表(只需5秒钟和2次单击),但首先禁用外键检查。没有CLI,也没有删除数据库并再次添加数据库。截断Mysql实例上的多个数据库表
SELECT Concat('TRUNCATE TABLE ',table_schema,'.',TABLE_NAME, ';')
FROM INFORMATION_SCHEMA.TABLES where table_schema in ('db1_name','db2_name');
使用查询结果截断表
注:
您可能会遇到以下错误:
ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails
如果存在具有外键的表引用您试图删除/截断的表,则会发生这种情况
在截断表之前,您只需执行以下操作:
SET FOREIGN_KEY_CHECKS=0;
SET FOREIGN_KEY_CHECKS=0;
截断表并将其更改回
SET FOREIGN_KEY_CHECKS=1;
SET FOREIGN_KEY_CHECKS=1;
使用这个表格
SELECT Concat('TRUNCATE TABLE ',table_schema,'.',TABLE_NAME, ';')
FROM INFORMATION_SCHEMA.TABLES where table_schema in ('db1_name','db2_name');
ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails
SET FOREIGN_KEY_CHECKS=0;
SET FOREIGN_KEY_CHECKS=1;
SELECT Concat('TRUNCATE TABLE ',table_schema,'.',TABLE_NAME, ';')
FROM INFORMATION_SCHEMA.TABLES where table_schema in (db1,db2)
INTO OUTFILE '/path/to/file.sql';
mysql -u username -p </path/to/file.sql
ERROR 1701 (42000) at line 3: Cannot truncate a table referenced in a foreign key constraint
SET FOREIGN_KEY_CHECKS=0;
TB=$( mysql -Bse "show tables from DATABASE" );
for i in ${TB};
do echo "Truncating table ${i}";
mysql -e "set foreign_key_checks=0; set unique_checks=0;truncate table DATABASE.${i}; set foreign_key_checks=1; set unique_checks=1";
sleep 1;
done
klarsen@Chaos:~$ mysql -Bse "select concat(table_name, ' depends on ', referenced_table_name)
from information_schema.referential_constraints
where constraint_schema = 'cpm'
order by referenced_table_name"
klarsen@Chaos:~$ mysql -Bse "SELECT table_name, table_rows FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'cpm'" | cat -n
1 address 297
2 approval_external_system 0
3 approval_request 0
4 country 189
5 credential 468
6 customer 6776
7 customer_identification 5631
8 customer_image 2
9 customer_status 13639
klarsen@Chaos:~$ TB=$( mysql -Bse "show tables from cpm" ); for i in ${TB}; do echo "Truncating table ${i}"; mysql -e "set foreign_key_checks=0; set unique_checks=0;truncate table cpm.${i}; set foreign_key_checks=1; set unique_checks=1"; sleep 1; done
klarsen@Chaos:~$ mysql -Bse "SELECT table_name, table_rows FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'cpm'" | cat -n
1 address 0
2 approval_external_system 0
3 approval_request 0
4 country 0
5 credential 0
6 customer 0
7 customer_identification 0
8 customer_image 0
9 customer_status 0
10 email_address 0
C:\>for /F "tokens=*" %a IN ('mysql -Bse "show tables" cpm') do mysql -e "set foreign_key_checks=0; set unique_checks=0; truncate table %a; foreign_key_checks=1; set unique_checks=1" cpm
SELECT CONCAT(
'SET FOREIGN_KEY_CHECKS=0; ',
GROUP_CONCAT(dropTableSql SEPARATOR '; '), '; ',
'SET FOREIGN_KEY_CHECKS=1;'
) as dropAllTablesSql
FROM ( SELECT Concat('TRUNCATE TABLE ', table_schema, '.', TABLE_NAME) AS dropTableSql
FROM INFORMATION_SCHEMA.TABLES
WHERE table_schema = 'DATABASE_NAME' ) as queries
mysqldump -u root -p --no-data dbname > schema.sql
mysqldump -u root -p drop dbname
mysqldump -u root -p < schema.sql
<?php
// connect to database
$conn=mysqli_connect("localhost","user","password","database");
// check connection
if (mysqli_connect_errno()) {
exit('Connect failed: '. mysqli_connect_error());
}
// sql query
$sql =mysqli_query($conn,"TRUNCATE " . TABLE_NAME);
// Print message
if ($sql === TRUE) {
echo 'data delete successfully';
}
else {
echo 'Error: '. $conn->error;
}
$conn->close();
?>
SET FOREIGN_KEY_CHECKS=0;
TRUNCATE `table1`;
TRUNCATE `table2`;
TRUNCATE `table3`;
TRUNCATE `table4`;
TRUNCATE `table5`;
TRUNCATE `table6`;
TRUNCATE `table7`;
SET FOREIGN_KEY_CHECKS=1;
SELECT GROUP_CONCAT(Concat('TRUNCATE TABLE ',table_schema,'.',TABLE_NAME) SEPARATOR ';') FROM INFORMATION_SCHEMA.TABLES where table_schema in ('my_db');
DROP PROCEDURE IF EXISTS trunctables;
DELIMITER ;;
CREATE PROCEDURE trunctables(theDb varchar(64))
BEGIN
declare tname varchar(64);
declare tcursor CURSOR FOR
SELECT table_name FROM information_schema.tables WHERE table_type <> 'VIEW' AND table_schema = theDb;
SET FOREIGN_KEY_CHECKS = 0;
OPEN tcursor;
l1: LOOP
FETCH tcursor INTO tname;
if tname = NULL then leave l1; end if;
set @sql = CONCAT('truncate `', theDB, '`.`', tname, '`');
PREPARE stmt from @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END LOOP l1;
CLOSE tcursor;
SET FOREIGN_KEY_CHECKS = 1;
END ;;
DELIMITER ;
call util.trunctables('nameofdatabase');
SELECT Concat('TRUNCATE TABLE ',table_schema,'.',TABLE_NAME, ';')
FROM INFORMATION_SCHEMA.TABLES where table_schema in ('databasename1','databasename2');
SET FOREIGN_KEY_CHECKS=0;
SET FOREIGN_KEY_CHECKS=1;
$truncate = mysql_query("SELECT Concat('TRUNCATE TABLE ',table_schema,'.',TABLE_NAME, ';') as tables_query FROM INFORMATION_SCHEMA.TABLES where table_schema in ('databasename')");
while($truncateRow=mysql_fetch_assoc($truncate)){
mysql_query($truncateRow['tables_query']);
}
?>
SET FOREIGN_KEY_CHECKS = 0;
SELECT @str := CONCAT('TRUNCATE TABLE ', table_schema, '.', table_name, ';')
FROM information_schema.tables
WHERE table_type = 'BASE TABLE'
AND table_schema IN ('db1_name','db2_name');
PREPARE stmt FROM @str;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET FOREIGN_KEY_CHECKS = 1;
mysql -Nse 'show tables' -D DATABASE -uUSER -pPWD | while read table; do echo "SET FOREIGN_KEY_CHECKS = 0;drop table \`$table\`;SET FOREIGN_KEY_CHECKS = 1;"; done | mysql DATABASE -uUSER -pPWD
truncate_tables_in_mysql() {
type mysql >/dev/null 2>&1 && echo "MySQL present." || sudo apt-get install -y mysql-client
tables=$(mysql -h 127.0.0.1 -P $MYSQL_PORT -u $MYSQL_USER -p$MYSQL_PASSWORD -e "USE $BACKEND_DATABASE;
SHOW TABLES;")
tables_list=($tables)
query_string="USE $BACKEND_DATABASE; SET FOREIGN_KEY_CHECKS = 0;"
for table in "${tables_list[@]:1}"
do
query_string="$query_string TRUNCATE TABLE \`$table\`; "
done
query_string="$query_string SET FOREIGN_KEY_CHECKS = 1;"
mysql -h 127.0.0.1 -P $MYSQL_PORT -u $MYSQL_USER -p$MYSQL_PASSWORD -e "$query_string"
}