Go error: time.Time does not implement driver.Valuer (method Value is missing)

php editor Zimo may encounter a common error during development using the Go language: "Go error: time.Time does not implement driver.Valuer (method Value is missing) )". This error usually occurs when storing values ​​of type time.Time into the database. It shows that the time.Time type does not implement the driver.Valuer interface and is missing the Value method. There are many ways to solve this problem. We can customize a new time type or use a third-party library to handle the storage of time types. In this article, we will introduce the cause and solution of this error in detail to help developers better understand and solve this problem.

Question content

I'm working on a Go project where I'm using sqlboiler to generate code from a SQLite3 database I created using a setup.sh script. I've encountered an error that I can't seem to resolve. The error message is:

graph/db/repositories.go:998:23: cannot use o.CreatedAt (variable of type string) as driver.Valuer value in argument to queries.MustTime: string does not implement driver.Valuer (missing method Value)
graph/db/repositories.go:999:23: cannot use &o.CreatedAt (value of type *string) as sql.Scanner value in argument to queries.SetScanner: *string does not implement sql.Scanner (missing method Scan)

This error occurs when I try to use the time.Time value in the graph/db/repositories.go file. I'm using golang:1.21-alpine3.18 Docker image for my project.

I try to change the created_at column type in the repository table of the SQLite3 database. I've tested it using TEXT and TIMESTAMP data types but the error persists.

Does anyone know what might be causing this error and how to fix it?

repositories.go

func (o *Repository) Insert(ctx context.Context, exec boil.ContextExecutor, columns boil.Columns) error {
    if o == nil {
        return errors.New("db: no repositories provided for insertion")
    }

    var err error
    if !boil.TimestampsAreSkipped(ctx) {
        currTime := time.Now().In(boil.GetLocation())

        if queries.MustTime(o.CreatedAt).IsZero() {
            queries.SetScanner(&o.CreatedAt, currTime)
        }
    }

    if err := o.doBeforeInsertHooks(ctx, exec); err != nil {
        return err
    }

    nzDefaults := queries.NonZeroDefaultSet(repositoryColumnsWithDefault, o)

    key := makeCacheKey(columns, nzDefaults)
    repositoryInsertCacheMut.RLock()
    cache, cached := repositoryInsertCache[key]
    repositoryInsertCacheMut.RUnlock()

setup.sh

#!/usr/local/bin/sh

set -eu

readonly DBFILE_NAME="mygraphql.db"

# Create DB file
if [ ! -e ${DBFILE_NAME} ];then
  echo ".open ${DBFILE_NAME}" | sqlite3
fi

# Create DB Tables
echo "creating tables..."
sqlite3 ${DBFILE_NAME} "
PRAGMA foreign_keys = ON;

CREATE TABLE IF NOT EXISTS users(\
    id TEXT PRIMARY KEY NOT NULL,\
    name TEXT NOT NULL,\
    project_v2 TEXT\
);

CREATE TABLE IF NOT EXISTS repositories(\
    id TEXT PRIMARY KEY NOT NULL,\
    owner TEXT NOT NULL,\
    name TEXT NOT NULL,\
    created_at TEXT NOT NULL DEFAULT (DATETIME('now','localtime')),\
    FOREIGN KEY (owner) REFERENCES users(id)\
);

CREATE TABLE IF NOT EXISTS issues(\
    id TEXT PRIMARY KEY NOT NULL,\
    url TEXT NOT NULL,\
    title TEXT NOT NULL,\
    closed INTEGER NOT NULL DEFAULT 0,\
    number INTEGER NOT NULL,\
    repository TEXT NOT NULL,\
    CHECK (closed IN (0, 1)),\
    FOREIGN KEY (repository) REFERENCES repositories(id)\
);

CREATE TABLE IF NOT EXISTS projects(\
    id TEXT PRIMARY KEY NOT NULL,\
    title TEXT NOT NULL,\
    url TEXT NOT NULL,\
    owner TEXT NOT NULL,\
    FOREIGN KEY (owner) REFERENCES users(id)\
);

CREATE TABLE IF NOT EXISTS pullrequests(\
    id TEXT PRIMARY KEY NOT NULL,\
    base_ref_name TEXT NOT NULL,\
    closed INTEGER NOT NULL DEFAULT 0,\
    head_ref_name TEXT NOT NULL,\
    url TEXT NOT NULL,\
    number INTEGER NOT NULL,\
    repository TEXT NOT NULL,\
    CHECK (closed IN (0, 1)),\
    FOREIGN KEY (repository) REFERENCES repositories(id)\
);

CREATE TABLE IF NOT EXISTS projectcards(\
    id TEXT PRIMARY KEY NOT NULL,\
    project TEXT NOT NULL,\
    issue TEXT,\
    pullrequest TEXT,\
    FOREIGN KEY (project) REFERENCES projects(id),\
    FOREIGN KEY (issue) REFERENCES issues(id),\
    FOREIGN KEY (pullrequest) REFERENCES pullrequests(id),\
    CHECK (issue IS NOT NULL OR pullrequest IS NOT NULL)\
);
"

# Insert initial data
echo "inserting initial data..."
sqlite3 ${DBFILE_NAME} "
PRAGMA foreign_keys = ON;

INSERT INTO users(id, name) VALUES\
    ('U_1', 'hsaki')
;

INSERT INTO repositories(id, owner, name) VALUES\
    ('REPO_1', 'U_1', 'repo1')
;

INSERT INTO issues(id, url, title, closed, number, repository) VALUES\
    ('ISSUE_1', 'http://example.com/repo1/issue/1', 'First Issue', 1, 1, 'REPO_1'),\
    ('ISSUE_2', 'http://example.com/repo1/issue/2', 'Second Issue', 0, 2, 'REPO_1'),\
    ('ISSUE_3', 'http://example.com/repo1/issue/3', 'Third Issue', 0, 3, 'REPO_1')\
;

INSERT INTO projects(id, title, url, owner) VALUES\
    ('PJ_1', 'My Project', 'http://example.com/project/1', 'U_1')\
;

INSERT INTO pullrequests(id, base_ref_name, closed, head_ref_name, url, number, repository) VALUES\
    ('PR_1', 'main', 1, 'feature/kinou1', 'http://example.com/repo1/pr/1', 1, 'REPO_1'),\
    ('PR_2', 'main', 0, 'feature/kinou2', 'http://example.com/repo1/pr/2', 2, 'REPO_1')\
;
"

sqlboiler.toml

pkgname="db"
output="graph/db"
wipe=true
add-global-variants=false
no-tests=true

[sqlite3]
  dbname = "./mygraphql.db"

environment

・ MacBook Pro M1 Pro

Workaround

I would say update the repository structure in Go to have CreatedAt as the time.Time field. When assigning a value to CreatedAt, use the time.Time value. For example, currTime := time.Now() Make your structure like this

type Repository struct {
    ID        string    `boil:"id" json:"id" toml:"id" yaml:"id"`
    Owner     string    `boil:"owner" json:"owner" toml:"owner" yaml:"owner"`
    Name      string    `boil:"name" json:"name" toml:"name" yaml:"name"`
    CreatedAt time.Time `boil:"created_at" json:"created_at" toml:"created_at" yaml:"created_at"`
    // other fields...
}

Then set the CreatedAt value:

repository := &Repository{
    ID:        "some-id",
    Owner:     "owner-id",
    Name:      "repo-name",
    CreatedAt: time.Now(), // setting it as time.Time
}

The above is the detailed content of Go error: time.Time does not implement driver.Valuer (method Value is missing). For more information, please follow other related articles on the PHP Chinese website!