Update column from Base64 to string (natively in SQL)
I've been trying to figure this out for two days now and would really appreciate some help. I've imported data from a csv where one field contained html data encoded in base64.
The idea is to loop over every row and run FROM_BASE64 on it.
How do I structure a query that:
- Loops over all lines
- Calls FRON_BASE64 for each line
- Runs UPDATE (or similar functionality) on that same row and column
Context: I'm running MariaDB (MySQL equivalent).
Thanks for any help!
mysql sql mariadb
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
asked Nov 19 '18 at 18:11
MentorMentor
462213
add a comment |
I've been trying to figure this out for two days now and would really appreciate some help. I've imported data from a csv where one field contained html data encoded in base64.
The idea is to loop over every row and run FROM_BASE64 on it.
How do I structure a query that:
- Loops over all lines
- Calls FRON_BASE64 for each line
- Runs UPDATE (or similar functionality) on that same row and column
Context: I'm running MariaDB (MySQL equivalent).
Thanks for any help!
mysql sql mariadb
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
asked Nov 19 '18 at 18:11
MentorMentor
462213
add a comment |
I've been trying to figure this out for two days now and would really appreciate some help. I've imported data from a csv where one field contained html data encoded in base64.
The idea is to loop over every row and run FROM_BASE64 on it.
How do I structure a query that:
- Loops over all lines
- Calls FRON_BASE64 for each line
- Runs UPDATE (or similar functionality) on that same row and column
Context: I'm running MariaDB (MySQL equivalent).
Thanks for any help!
mysql sql mariadb
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
asked Nov 19 '18 at 18:11
MentorMentor
462213
I've been trying to figure this out for two days now and would really appreciate some help. I've imported data from a csv where one field contained html data encoded in base64.
The idea is to loop over every row and run FROM_BASE64 on it.
How do I structure a query that:
- Loops over all lines
- Calls FRON_BASE64 for each line
- Runs UPDATE (or similar functionality) on that same row and column
Context: I'm running MariaDB (MySQL equivalent).
Thanks for any help!
mysql sql mariadb
mysql sql mariadb
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
asked Nov 19 '18 at 18:11
MentorMentor
462213
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
asked Nov 19 '18 at 18:11
MentorMentor
462213
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
edited Nov 19 '18 at 18:24
Bill Karwin
375k63514667
375k63514667
asked Nov 19 '18 at 18:11
MentorMentor
462213
asked Nov 19 '18 at 18:11
MentorMentor
462213
asked Nov 19 '18 at 18:11
MentorMentor
462213
462213
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Typically base64 would be used for binary data. You probably shouldn't store the decoded data in the same column as the base64-coded string. If necessary you should ALTER TABLE to add a new column that is VARBINARY or BLOB type, to hold the binary data.
ALTER TABLE MyTable ADD COLUMN BinaryField BLOB;
You can then fill that column with an UPDATE statement:
UPDATE MyTable SET BinaryField = FROM_BASE64(EncodedField);
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
Thank you for that! The current data type of the column is string (I'm importing into a table I didn't make and shouldn't alter). Would I cause issues withUPDATE MyTable SET BinaryField = FROM_BASE64(Binary Field) ;. In case I was unclear, I don't need the original Base64 string.
– Mentor
Nov 19 '18 at 18:37
Figured it out.update thetable set thecolumn = FROM_BASE64(thecolumn)did the trick. This was simpler than I anticipated.
– Mentor
Nov 19 '18 at 18:47
You might want to learn about character sets.
– Bill Karwin
Nov 19 '18 at 19:25
The Base64 column should beTEXT CHARACTER SET ascii COLLATE ascii_bin. (There are other options, but this is the most logical.)
– Rick James
Nov 20 '18 at 3:44
@RickJames, like I mentioned in my comment, the data was being imported into a database belonging to an existing codebase. The only reason the string was base64 encoded was to make it easier to store html in a csv file without causing syntax issues.
– Mentor
Nov 21 '18 at 10:22
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Typically base64 would be used for binary data. You probably shouldn't store the decoded data in the same column as the base64-coded string. If necessary you should ALTER TABLE to add a new column that is VARBINARY or BLOB type, to hold the binary data.
ALTER TABLE MyTable ADD COLUMN BinaryField BLOB;
You can then fill that column with an UPDATE statement:
UPDATE MyTable SET BinaryField = FROM_BASE64(EncodedField);
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
Thank you for that! The current data type of the column is string (I'm importing into a table I didn't make and shouldn't alter). Would I cause issues withUPDATE MyTable SET BinaryField = FROM_BASE64(Binary Field) ;. In case I was unclear, I don't need the original Base64 string.
– Mentor
Nov 19 '18 at 18:37
Figured it out.update thetable set thecolumn = FROM_BASE64(thecolumn)did the trick. This was simpler than I anticipated.
– Mentor
Nov 19 '18 at 18:47
You might want to learn about character sets.
– Bill Karwin
Nov 19 '18 at 19:25
The Base64 column should beTEXT CHARACTER SET ascii COLLATE ascii_bin. (There are other options, but this is the most logical.)
– Rick James
Nov 20 '18 at 3:44
@RickJames, like I mentioned in my comment, the data was being imported into a database belonging to an existing codebase. The only reason the string was base64 encoded was to make it easier to store html in a csv file without causing syntax issues.
– Mentor
Nov 21 '18 at 10:22
add a comment |
Typically base64 would be used for binary data. You probably shouldn't store the decoded data in the same column as the base64-coded string. If necessary you should ALTER TABLE to add a new column that is VARBINARY or BLOB type, to hold the binary data.
ALTER TABLE MyTable ADD COLUMN BinaryField BLOB;
You can then fill that column with an UPDATE statement:
UPDATE MyTable SET BinaryField = FROM_BASE64(EncodedField);
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
Thank you for that! The current data type of the column is string (I'm importing into a table I didn't make and shouldn't alter). Would I cause issues withUPDATE MyTable SET BinaryField = FROM_BASE64(Binary Field) ;. In case I was unclear, I don't need the original Base64 string.
– Mentor
Nov 19 '18 at 18:37
Figured it out.update thetable set thecolumn = FROM_BASE64(thecolumn)did the trick. This was simpler than I anticipated.
– Mentor
Nov 19 '18 at 18:47
You might want to learn about character sets.
– Bill Karwin
Nov 19 '18 at 19:25
The Base64 column should beTEXT CHARACTER SET ascii COLLATE ascii_bin. (There are other options, but this is the most logical.)
– Rick James
Nov 20 '18 at 3:44
@RickJames, like I mentioned in my comment, the data was being imported into a database belonging to an existing codebase. The only reason the string was base64 encoded was to make it easier to store html in a csv file without causing syntax issues.
– Mentor
Nov 21 '18 at 10:22
add a comment |
Typically base64 would be used for binary data. You probably shouldn't store the decoded data in the same column as the base64-coded string. If necessary you should ALTER TABLE to add a new column that is VARBINARY or BLOB type, to hold the binary data.
ALTER TABLE MyTable ADD COLUMN BinaryField BLOB;
You can then fill that column with an UPDATE statement:
UPDATE MyTable SET BinaryField = FROM_BASE64(EncodedField);
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
Typically base64 would be used for binary data. You probably shouldn't store the decoded data in the same column as the base64-coded string. If necessary you should ALTER TABLE to add a new column that is VARBINARY or BLOB type, to hold the binary data.
ALTER TABLE MyTable ADD COLUMN BinaryField BLOB;
You can then fill that column with an UPDATE statement:
UPDATE MyTable SET BinaryField = FROM_BASE64(EncodedField);
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
answered Nov 19 '18 at 18:27
Bill KarwinBill Karwin
375k63514667
375k63514667
Thank you for that! The current data type of the column is string (I'm importing into a table I didn't make and shouldn't alter). Would I cause issues withUPDATE MyTable SET BinaryField = FROM_BASE64(Binary Field) ;. In case I was unclear, I don't need the original Base64 string.
– Mentor
Nov 19 '18 at 18:37
Figured it out.update thetable set thecolumn = FROM_BASE64(thecolumn)did the trick. This was simpler than I anticipated.
– Mentor
Nov 19 '18 at 18:47
You might want to learn about character sets.
– Bill Karwin
Nov 19 '18 at 19:25
The Base64 column should beTEXT CHARACTER SET ascii COLLATE ascii_bin. (There are other options, but this is the most logical.)
– Rick James
Nov 20 '18 at 3:44
@RickJames, like I mentioned in my comment, the data was being imported into a database belonging to an existing codebase. The only reason the string was base64 encoded was to make it easier to store html in a csv file without causing syntax issues.
– Mentor
Nov 21 '18 at 10:22
add a comment |
Thank you for that! The current data type of the column is string (I'm importing into a table I didn't make and shouldn't alter). Would I cause issues withUPDATE MyTable SET BinaryField = FROM_BASE64(Binary Field) ;. In case I was unclear, I don't need the original Base64 string.
– Mentor
Nov 19 '18 at 18:37
Figured it out.update thetable set thecolumn = FROM_BASE64(thecolumn)did the trick. This was simpler than I anticipated.
– Mentor
Nov 19 '18 at 18:47
You might want to learn about character sets.
– Bill Karwin
Nov 19 '18 at 19:25
The Base64 column should beTEXT CHARACTER SET ascii COLLATE ascii_bin. (There are other options, but this is the most logical.)
– Rick James
Nov 20 '18 at 3:44
@RickJames, like I mentioned in my comment, the data was being imported into a database belonging to an existing codebase. The only reason the string was base64 encoded was to make it easier to store html in a csv file without causing syntax issues.
– Mentor
Nov 21 '18 at 10:22
Thank you for that! The current data type of the column is string (I'm importing into a table I didn't make and shouldn't alter). Would I cause issues with
UPDATE MyTable SET BinaryField = FROM_BASE64(Binary Field) ;. In case I was unclear, I don't need the original Base64 string.– Mentor
Nov 19 '18 at 18:37
Thank you for that! The current data type of the column is string (I'm importing into a table I didn't make and shouldn't alter). Would I cause issues with
UPDATE MyTable SET BinaryField = FROM_BASE64(Binary Field) ;. In case I was unclear, I don't need the original Base64 string.– Mentor
Nov 19 '18 at 18:37
Figured it out.
update thetable set thecolumn = FROM_BASE64(thecolumn) did the trick. This was simpler than I anticipated.– Mentor
Nov 19 '18 at 18:47
Figured it out.
update thetable set thecolumn = FROM_BASE64(thecolumn) did the trick. This was simpler than I anticipated.– Mentor
Nov 19 '18 at 18:47
You might want to learn about character sets.
– Bill Karwin
Nov 19 '18 at 19:25
You might want to learn about character sets.
– Bill Karwin
Nov 19 '18 at 19:25
The Base64 column should be
TEXT CHARACTER SET ascii COLLATE ascii_bin. (There are other options, but this is the most logical.)– Rick James
Nov 20 '18 at 3:44
The Base64 column should be
TEXT CHARACTER SET ascii COLLATE ascii_bin. (There are other options, but this is the most logical.)– Rick James
Nov 20 '18 at 3:44
@RickJames, like I mentioned in my comment, the data was being imported into a database belonging to an existing codebase. The only reason the string was base64 encoded was to make it easier to store html in a csv file without causing syntax issues.
– Mentor
Nov 21 '18 at 10:22
@RickJames, like I mentioned in my comment, the data was being imported into a database belonging to an existing codebase. The only reason the string was base64 encoded was to make it easier to store html in a csv file without causing syntax issues.
– Mentor
Nov 21 '18 at 10:22
add a comment |
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