How to Execute MySQL Queries in Go with Set Variables

Go MySQL Queries with SET Variables

Problem

You're trying to execute a MySQL query in Go that sets variables before running the query. However, when you run the query through Go, you're encountering a syntax error at the SELECT statement.

Solution

The solution to this problem involves two steps:

1. Configure DSN:

   • When connecting to your database, add the following settings to your DSN: ...&multiStatements=true&interpolateParams=true

2. Convert Collation:

   • If you're using MySQL, ensure that your database and tables are using the same collation. If they're not, convert them to utf8mb4_general_ci.

Explanation

DSN Configuration:

The multiStatements setting allows multiple statements to be executed in a single query. The interpolateParams setting enables parameter interpolation, which allows you to use ? placeholders for query parameters.

Collation Conversion:

MySQL has multiple collations, which determine how characters are sorted and compared. If the collation of the database and tables doesn't match, you can encounter collation errors when performing comparisons. Converting to a consistent collation resolves this issue.

By making these changes, you'll be able to execute your query successfully in Go while setting variables beforehand.

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