数据库现在是latin1_general_ci,我想将排序规则更改为utf8mb4_general_ci。
在PhpMyAdmin中是否有任何设置来更改数据库,表,列的排序规则?而不是一个一个地改变?
数据库现在是latin1_general_ci,我想将排序规则更改为utf8mb4_general_ci。
在PhpMyAdmin中是否有任何设置来更改数据库,表,列的排序规则?而不是一个一个地改变?
当前回答
快速方法-导出到SQL文件,使用搜索和替换来更改您需要更改的文本。创建新数据库,导入数据,然后将旧数据库和新数据库重命名为旧名称。
其他回答
下面的查询将生成ALTER查询,将所有表中所有适当列的排序规则更改为某种类型(在下面的示例中为utf8_general_ci)。
SELECT concat
(
'ALTER TABLE ',
t1.TABLE_SCHEMA,
'.',
t1.table_name,
' MODIFY ',
t1.column_name,
' ',
t1.data_type,
'(' ,
CHARACTER_MAXIMUM_LENGTH,
')',
' CHARACTER SET utf8 COLLATE utf8_general_ci;'
)
from
information_schema.columns t1
where
t1.TABLE_SCHEMA like 'you_db_name_goes_here' AND
t1.COLLATION_NAME IS NOT NULL AND
t1.COLLATION_NAME NOT IN ('utf8_general_ci');
您可以简单地将此代码添加到脚本文件
//Database Connection
$host = 'localhost';
$db_name = 'your_database_name';
$db_user = 'your_database_user_name';
$db_pass = 'your_database_user_password';
$con = mysql_connect($host,$db_user,$db_pass);
if(!$con) { echo "Cannot connect to the database ";die();}
mysql_select_db($db_name);
$result=mysql_query('show tables');
while($tables = mysql_fetch_array($result)) {
foreach ($tables as $key => $value) {
mysql_query("ALTER TABLE $value CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci");
}
}
echo "The collation of your database has been successfully changed!";
修改数据库中所有表中所有字段的排序规则。
我只是通过前面提到的Php为表中的字段添加另一个循环到解决方案。这很有帮助,表中的所有字段也都转换了。
<?php
$con = mysql_connect('localhost','user','pw');
if(!$con) { echo "Cannot connect to the database ";die();}
mysql_select_db('database_name');
$result=mysql_query('show tables');
while($tables = mysql_fetch_array($result)) {
foreach ($tables as $key => $table) { // for each table
$sql = "ALTER TABLE $table CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci";
echo "\n".$sql;
mysql_query($sql);
$sql = "show fields in ".$table." where type like 'varchar%' or type like 'char%' or type='text' or type='mediumtext';";
$rs2=mysql_query($sql);
while( $rw2 = mysql_fetch_array($rs2) ){ // for each field in table
$sql = "ALTER TABLE `".$table."` CHANGE `".$rw2['Field']."` `".$rw2['Field']."` ".$rw2['Type']." CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL;";
echo "\n".$sql;
mysql_query($sql);
}
}
}
echo "The collation of your database has been successfully changed!";
?>}
生成查询以更新每个表和每个表的列。 我以前在我的一些项目中使用过这种方法,并且能够解决我的大部分COLLATION问题。(特别是在join上)
要使用,只需将结果导出为带分隔符的文本(可能是新行'\n')
每个表
SELECT CONCAT('ALTER TABLE `', TABLE_NAME,
'` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;')
AS 'USE `DATABASE_NAME`;'
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'DATABASE_NAME'
AND TABLE_TYPE LIKE 'BASE TABLE'
每一列
SELECT CONCAT('ALTER TABLE `', TABLE_NAME, '` MODIFY COLUMN `', COLUMN_NAME,'` ',
DATA_TYPE, IF(CHARACTER_MAXIMUM_LENGTH IS NULL
OR DATA_TYPE LIKE 'longtext', '', CONCAT('(', CHARACTER_MAXIMUM_LENGTH,
')')
), ' COLLATE utf8mb4_unicode_ci;') AS 'USE `DATABASE_NAME`;'
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = 'DATABASE_NAME'
AND (SELECT INFORMATION_SCHEMA.TABLES.TABLE_TYPE
FROM INFORMATION_SCHEMA.TABLES
WHERE INFORMATION_SCHEMA.TABLES.TABLE_SCHEMA =
INFORMATION_SCHEMA.COLUMNS.TABLE_SCHEMA
AND INFORMATION_SCHEMA.TABLES.TABLE_NAME =
INFORMATION_SCHEMA.COLUMNS.TABLE_NAME
LIMIT 1) LIKE 'BASE TABLE'
AND DATA_TYPE IN ( 'char', 'varchar' ) /* include other types if necessary */
只需运行这个SQL语句就可以一次转换所有数据库表。根据需要更改COLLATION和databaseName。
SELECT CONCAT("ALTER TABLE ", TABLE_SCHEMA, '.', TABLE_NAME," COLLATE utf8_general_ci;") AS ExecuteTheString
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA="databaseName"
AND TABLE_TYPE="BASE TABLE";