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Catch error when using SQLite in Golang

#go #sqlite

I was working on a project using Go and SQLite. For the driver part, I tried 2 libraries:

Below are examples to how to catch "primary key conflict" and "no row found" errors:

With mattn sqlite library: 

import ( "database/sql" "github.com/mattn/go-sqlite3" ) var ( ErrDup = errors.New("record already exists") ErrNoRecord = errors.New("record not found") ) func wrapDBError(err error) error { var sqliteErr sqlite3.Error if errors.As(err, &sqliteErr) { if errors.Is(sqliteErr.Code, sqlite3.ErrConstraint) { return ErrDup } } else if errors.Is(err, sql.ErrNoRows) { return ErrNoRecord } return err }
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The problem is that it is using CGO, and I am using Macbook M1 for my development. I want to build a release for linux amd64, if I just use:

$ GOOS=linux GOARCH=amd64 go build -o app-linux
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It will throw some errors that can't find some symbol. The library suggest to use xgo to cross build, but I still got some errors when I was doing so. Without having time to search and find the problem, I fell back to compile the linux binary with a docker image:

# I am developing on mac m1, so this can be directly built GOOS=darwin GOARCH=arm64 go build -o build/myapp-darwin # for linux, using docker to build it docker run --rm -v $(PWD):/myapp -w /myapp amd64/golang:bullseye go build -o build/myapp-linux -v
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This works, both myapp-darwin and myapp-linux will be compiled and generated under the build folder. However, the second build with docker would take much longer time than I thought, approximately 1~2 minutes.

So I start to looking for other libraries that doesn't require CGO.

With modernc.org/sqlite library

This library doesn't need CGO, and I am able to find the way how to catch the "primary key conflict" and "no rows found" error by looking the source code:

import ( "database/sql" "modernc.org/sqlite" sqlite3 "modernc.org/sqlite/lib" ) func wrapDBError(err error) error { if err != nil { if errors.Is(err, sql.ErrNoRows) { return ErrNoRecord } if liteErr, ok := err.(*sqlite.Error); ok { code := liteErr.Code() if code == sqlite3.SQLITE_CONSTRAINT_PRIMARYKEY { return ErrDup } } } return err }
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Since this lib doesn't use CGO, cross-build is easy and fast:

GOOS=darwin GOARCH=arm64 go build -o build/myapp-darwin GOOS=linux GOARCH=amd64 go build -o build/myapp-linux
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It only takes seconds to finish the compilation.

Conclusion

For now I will stick to the second library which doesn't require CGO. Other than catching the errors part, there are basically no difference between those 2 libraries when writing sql (CRUD) operations.

Reference

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