有什么方法可以在不使用php或仅使用SQL语言的情况下反序列化和序列化mysql中的数据？
致力于woocommerce插件，该插件存储在数据库中序列化的购物车商品。 目的是对购物车表进行查询并获取购物车项目，然后将结果发送到API。 购物车项目以序列化数据的形式存储在表中，例如：
a:1:{s:4:"cart";a:2:{s:32:"76dc611d6ebaafc66cc0879c71b5db5c";a:11:{s:3:"key";s:32:"76dc611d6ebaafc66cc0879c71b5db5c";s:10:"product_id";i:128;s:12:"variation_id";i:0;s:9:"variation";a:0:{}s:8:"quantity";i:1;s:9:"data_hash";s:32:"b5c1d5ca8bae6d4896cf1807cdf763f0";s:13:"line_tax_data";a:2:{s:8:"subtotal";a:0:{}s:5:"total";a:0:{}}s:13:"line_subtotal";d:500;s:17:"line_subtotal_tax";i:0;s:10:"line_total";d:500;s:8:"line_tax";i:0;}s:32:"65ded5353c5ee48d0b7d48c591b8f430";a:6:{s:3:"key";s:32:"65ded5353c5ee48d0b7d48c591b8f430";s:10:"product_id";i:132;s:12:"variation_id";i:0;s:9:"variation";a:0:{}s:8:"quantity";i:1;s:9:"data_hash";s:32:"b5c1d5ca8bae6d4896cf1807cdf763f0";}}}
在在线工具中反序列化之后，我得到了这样的结构：
Array
(
[cart] => Array
(
[76dc611d6ebaafc66cc0879c71b5db5c] => Array
(
[key] => 76dc611d6ebaafc66cc0879c71b5db5c
[product_id] => 128
[variation_id] => 0
[variation] => Array
(
)
[quantity] => 1
[data_hash] => b5c1d5ca8bae6d4896cf1807cdf763f0
[line_tax_data] => Array
(
[subtotal] => Array
(
)
[total] => Array
(
)
)
[line_subtotal] => 500
[line_subtotal_tax] => 0
[line_total] => 500
[line_tax] => 0
)
[65ded5353c5ee48d0b7d48c591b8f430] => Array
(
[key] => 65ded5353c5ee48d0b7d48c591b8f430
[product_id] => 132
[variation_id] => 0
[variation] => Array
(
)
[quantity] => 1
[data_hash] => b5c1d5ca8bae6d4896cf1807cdf763f0
)
)
)
需要访问此对象的每个属性，并将其存储在列中，然后将查询结果发送到API。
如何用SQL语言反序列化这些数据？
答案 0 :(得分：2)
我一直在为一个类似的问题而苦苦挣扎：从表 wp_postmeta 反序列化和序列化数据，对它的某些部分进行搜索和替换（我正在翻译 WooCommerce 站点，我更愿意在 MySQL 中完成这一切） ，而不是使用 PHP）。就我而言，搜索和替换总是发生在第四个 s 元素上。我为此开发了一个程序。它可能不适合您的确切用例，但可能足以满足您的需求：
CREATE DEFINER=`strompf`@`localhost` PROCEDURE `replace_serial`(
in table_name_in tinytext, # Source table name
in col_serial_data_src_in tinytext, # Column with source serialised data
in col_serial_data_dst_in tinytext, # Column with destination serialised data
in col_src_in tinytext, # Column with source text strings
in col_dst_in tinytext # Column with desination text string
)
BEGIN
#
# Find-and-replace in element s4 within serialised content
################################################################################
#
# * This sproc "replace_serial" needs as input pointers to a table
# ("pointer table") with the following columns:
# * Column with the source serialised data
# * Column for storing the updated serialised data
# * Column with find-string
# * Column with replace-strings
# * It can be any table: The arguments for replace_serial() contains the name
# of this table and the names of those four columns
# * Internally, data from this input-table is copied to temporary table
# "serial_tmp"
# * The designated serialised data is decomposed into several fields (again,
# in table "serial_tmp") - Currently, this sproc only works for serialised
# data with 1 a-element, followed by 6 s-elements. This sproc has not been
# tested with other configurations
# * Find-and-replace is only performed on element s4 (=the 4th s-element)
# * Subsequently, the new length of s4 is calculated, and the serialised string
# is written to the designated column in the "pointer table"
# * Subsequently, it's up to the programmer to process the resulting data in
# the pointer table
# * This approach with a "pointer table" works really well: Easy to grasp,
# flexible and easy to debug. It's especially handy for debugging or further
# processing that the output is in a separate column from the input.
# * Copyright Jeroen Strompf - De Vliegende Brigade - 2021.03.09
#
#
# History
########################################
#
# * 2021.03.09: Created, tested and pushed to "bal_dwh_org"
#
#
################################################################################
# Define working table "serial_tmp"
################################################################################
#
drop table if exists
serial_tmp;
create temporary table
serial_tmp
(
serial_data_src varchar(255) comment "Actual serialised data",
serial_data_dst varchar(255) comment "Resulting serialised data. This is a separate field, to make debugging easier",
find_string varchar(255) comment "String to be found within serial_data_src",
replace_string varchar(255) comment "Replacement string for within serial_data_src, resulting in serial_data_dst",
a_len smallint,
a_string varchar(255) comment "The string within the accolade",
s1 varchar(255) comment "Complete s-part, including length statement and string",
s2 varchar(255),
s3 varchar(255),
s4 varchar(255) comment "Complete s4-string",
s4_len_src smallint comment "Original length of s4",
s4_string_src varchar(255) comment "Original s4 string",
s4_len_dst smallint comment "New length",
s4_string_dst varchar(255) comment "New string",
s5 varchar(255),
s6 varchar(255)
);
################################################################################
# Copy working data to working table
################################################################################
#
set @ddl=concat
(
"insert into serial_tmp
(
serial_data_src,
find_string,
replace_string
)
select ",
col_serial_data_src_in, ", ",
col_src_in, ", ",
col_dst_in, " ",
"from ",
table_name_in, ";"
);
prepare stmt from @ddl;
execute stmt;
deallocate prepare stmt;
################################################################################
# Decompose serialsed data
################################################################################
#
# Leading a-field
########################################
#
update
serial_tmp
set
a_len = substring_index(substring_index(serial_data_src, ":", 2), ":", -1),
a_string = substring_index(substring_index(serial_data_src, "}",1), "{", -1);
# Complete s-fields
########################################
#
update
serial_tmp
set
s1 = substring_index(a_string, ";", 1),
s2 = substring_index(substring_index(a_string, ";", 2), ";", -1),
s3 = substring_index(substring_index(a_string, ";", 3), ";", -1),
s4 = substring_index(substring_index(a_string, ";", 4), ";", -1),
s5 = substring_index(substring_index(a_string, ";", 5), ";", -1),
s6 = substring_index(substring_index(a_string, ";", 6), ";", -1);
# Further decompose s4
########################################
#
update
serial_tmp
set
s4_len_src = substring_index(substring_index(s4, ":", 2), ":", -1),
s4_string_src = substring_index(substring_index(s4, '"', 2), '"', -1);
################################################################################
# Find-and-replace
################################################################################
#
# Finally! The heart of the matter
#
update
serial_tmp
set
s4_string_dst = replace(s4_string_src, find_string, replace_string),
s4_len_dst = length(s4_string_dst);
################################################################################
# Reassemble
################################################################################
#
update
serial_tmp
set
serial_data_dst = concat
(
"a:",a_len, ":",
"{",
s1, ";", s2, ";", s3, ";",
"s:",s4_len_dst,":",
char(34),
s4_string_dst,
char(34),
";", s5, ";", s6, ";",
"}"
);
################################################################################
# Copy results back to the original input table
################################################################################
#
# * Fill in the result in column "col_serial_data_dst_in"
#
set @ddl2=concat
(
"update ", table_name_in, "
join
serial_tmp
on
serial_tmp.serial_data_src = ", table_name_in, ".",col_serial_data_src_in,"
set
",table_name_in, ".",col_serial_data_dst_in, " = serial_tmp.serial_data_dst;"
);
prepare stmt from @ddl2;
execute stmt;
deallocate prepare stmt;
END
答案 1 :(得分：0)
serialize PHP函数将数据结构序列化为一个字符串表示形式，该字符串表示形式对PHP 唯一，并且可以使用反序列化将其反转为PHP对象。
MySQL不知道什么是PHP序列化。您不能仅使用SQL来做到这一点。