If you have any questions about replacing strings in your MySQL database, don’t hesitate to drop a line down below in the comments. It’s not very pretty, but it gets the job done. sed -i 's#http:\/\/tonyflorida\.com#https:\/\/tonyflorida\.com#g' db.sqlĪlso notice how we escape the forward slashes in the URL with backward slashes. In the example below, instead of a slash, we use a hashtag as our delimiter to find and replace a URL in our MySQL database. Well, the cool thing about sed is that whatever character follows the leading s is the delimiter. 18.1k 34 95 118 Add a comment 2 Answers Sorted by: 24 Try this one mysql'select replace (text,'\'',\''\') from mytable' Then the query will become select replace (text,''',''') from mytable at the Mysql end. What if you need to find and replace a string with a slash like a URL? This might initially seem impossible since the sed command itself uses a forward slash as a delimiter to begin with. You already have a copy of your database! What About Slashes? Mysql mydatabase tmp and then mv tmp db.sql to “manually edit in place” ?įinally, we take our modified db.sql file and apply it back to the MySQL database. Sed -i 's/stringtofind/stringtoreplace/g' db.sql The easiest way to search and replace a string across all tables in a MySQL database is with mysqldump and sed. I’ll walk you though every step of the process. With some command line magic and help from our good old friend sed, you can replace a string across every single table in your database. I hope this has been helpful and this little tip will come in handy when you have to deal with such a situation.It’s surprisingly easy to perform a find and replace on an entire MySQL database. The REPLACE function does not support regular expression so if you need to replace a text string by a pattern you need to use MySQL user-defined function (UDF) from external library, check it out here MySQL UDF with Regex. If you put the quotes to the field name like “field_name”, the query will update the content of that column to “field_name”, which is causing unexpected data loss. It is very important to note that in the REPLACE function, the first parameter is the column name without quotes (“). The query finds all occurrences of the domain about and replaces it by the correct value in the domain_names column of the domain list table. MySQL provides you with a useful string function called REPLACE that allows you to replace a string in a column of a table by a new string. You can use the REPLACE function as follows: UPDATE domainList In the table in the sample database table below:. MySQL REPLACE string function example useįor example, if you want to correct the domain name scenario I was talking about in the first paragraph. Note that when searching for text to replace, MySQL uses the case-sensitive match to perform a search for a string to be replaced. The syntax of using the REPLACE function in an UPDATE statement is as follows: UPDATE tbl_name The REPLACE function is very handy to search and replace text in a table such as updating obsolete URL, correcting a spelling mistake, etc. You should not confuse the REPLACE statement with the REPLACE string function. It replaces the old_string by the new_string in the stringĪ very important thing to note here is that there is a statement also called REPLACE used to insert or update data. The REPLACE function has three parameters. The syntax of the REPLACE function is as follows: REPLACE(str,old_string,new_string) MySQL provides you with a useful string function called REPLACE that allows you to replace a string in a column of a table by a new string. In this article we will be going over an example of using the REPLACE STRING function in MySQL. Thankfully, MySQL comes with a string replace function which can be used for this exact problem. Solving a problem like this shouldn’t take more that 10 minutes right? That’s what I thought. The only problem with the approach is that if you have a very huge database, then this can take a really long time to accomplish. This is certainly the first way that came to mind when I came across this situation recently. One way to do this is to export the entire database or just the table into a SQL file and do a regular find and replace with a text-editor of your choice. There are actually a couple of ways that you can go about doing this. If you have a similar situation then this article will help. Let’s say you change the name of your website and there is a particular column with rows that have the old domain name and you would like to change it into the new one. Have you ever run into the issue where you have a fairly large MySQL table and you would like to replace a string on one or more of the columns?
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