下面的查询将为Mysql模式中的所有数据库表生成一个截断命令列表。(将dbSchemaName1替换为您的Db模式名。)

SELECT CONCAT('TRUNCATE TABLE ',table_schema,'.',TABLE_NAME, ';') 
    FROM INFORMATION_SCHEMA.TABLES WHERE table_schema IN ('dbSchemaName1','dbSchemaName2');

复制查询结果(可能看起来像下面这样)，并将截断命令列表粘贴到MySQL Worbench或您选择的查询命令工具中的SQL查询选项卡中:

TRUNCATE TABLE dbSchemaName1.table1;
TRUNCATE TABLE dbSchemaName1.table2;
TRUNCATE TABLE dbSchemaName1.table3;

注意:您可能会收到以下错误:

ERROR 1217 (23000): Cannot delete or update a parent row: a foreign key constraint fails

如果存在外键引用您试图删除/截断的表的表，就会发生这种情况。

要解决在运行truncate命令之前关闭外键检查的问题:

SET FOREIGN_KEY_CHECKS=0;  -- turn off foreign key checks
TRUNCATE TABLE dbSchemaName1.table1;  -- truncate tables
TRUNCATE TABLE dbSchemaName1.table2;
TRUNCATE TABLE dbSchemaName1.table3;
SET FOREIGN_KEY_CHECKS=1;  -- turn on foreign key checks

<?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();

?>

这是我用来清除一个表的代码片段。只需更改$conn info和TABLE_NAME。

下面是一个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，我会删除这个答案。

未测试的

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;

To truncate a table, one must drop the foreign key constraints mapped to the columns in this table from other tables (in fact on all tables in the specific DB/Schema). So, all foreign key constraints must be dropped initially followed by table truncation. Optionally, use the optimize table (in mysql, innodb engine esp) to reclaim the used data space/size to OS after data truncation. Once data truncation is carried out, create the same foreign key constraints again on the same table. See below a script that would generate the script to carry out the above operations. 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';

现在，运行Db Truncate。生成SQL脚本

的好处。 1)回收磁盘空间 2)不需要删除并重新创建具有相同结构的DB/Schema

缺点。 1) FK约束应该是表中的名称，约束名称中包含“FK”。

PHP单命令:

php -r '$d="PUT_YOUR_DB_NAME_HERE"; $q="show tables"; $dt="drop table"; exec("mysql -Nse \"$q\" $d", $o); foreach($o as $e) `mysql -e "$dt $e" $d`;'

执行的PHP脚本:

$d="PUT_YOUR_DB_NAME_HERE"; 
$q="show tables"; 
$dt="drop table"; 

exec("mysql -Nse \"$q\" $d", $o); 

foreach($o as $e)
  `mysql -e "$dt $e" $d`;

溶液(1)

mysql> select group_concat('truncate',' ',table_name,';') from information_schema.tables where table_schema="db_name" into outfile '/tmp/a.txt';
mysql> /tmp/a.txt;

溶液2)

- Export only structure of a db
- drop the database
- import the .sql of structure 

——编辑----

earlier in solution 1, i had mentioned concat() instead of group_concat() which would have not returned the desired result