Question

我正在使用Flask开发Web应用程序。在某些时候，我必须将某个HTML脚本插入MySQL数据库：

<h3>Welcome!</h3>
<p>Some text</p>

当我将它插入数据库时（当它被烧瓶＆＃39; render_template＆＃39;函数返回时）：

\n\n<h3>Welcome!</h3>\n\n\n\n<p>Some text</p>

我收到以下错误：

TypeError: ProgrammingError(1064, "You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '\\\\\\\\n\\\\n<h3>Welcome!</h3>\\\\n\\\\n\\\\n\\\\n<p>Some text' at line 1") is not JSON serializable

我首先不明白什么是JSON可序列化的＆＃39;意思是，我想知道我做错了什么。我已经尝试取消换行符（\n）但它仍然显示相同的错误。为什么？我很感谢您提供的任何答案。

Answer 1

将HTML写入数据库时常用的解决方案：

1）只需将数据库字段类型转换为blob，即可接受二进制数据，然后将HTML编码为二进制（以下示例）。 2）将数据库字段保留为文本字段，但base64对数据进行编码，以便数据库不会抱怨非法字符。

# Example for case 1.
# Note that you need to make sure the database field is a blob:
html = '<h3>Welcome!</h3>\n<p>Some text</p>'
bin = html.encode()
dbhandle.execute('INSERT INTO script (various fields, binhtml) VALUES (..., bin)')
# When you read back the data, remember to decode.
dbhandle.execute('SELECT binhtml FROM script WHERE...')
resultset = dbhandle.fetchall()
htmlresult = resultset.decode()

# Example for case 2.
# Database field can be a text/varchar type because base64 ensures it will work.
import base64
html = '<h3>Welcome!</h3>\n<p>Some text</p>'
# Convert HTML into base64 encoded *text* so it can be stored in text field.
encoded =  base64.b64decode(html.encode()).decode()
# Do the database INSERT.
...
# Retrieve the stored text from the database and convert back to HTML
dbhandle.execute('SELECT encodedhtml FROM script WHERE...')
resultset = dbhandle.fetchall()
htmlresult = base64.b64decode(resultset).decode()

将HTML插入到mysql数据库中，显示类型错误

1 个答案: