mirror of
https://github.com/TECHNOFAB11/dbmate.git
synced 2025-12-11 23:50:04 +01:00
Refactor drivers into separate packages (#179)
`dbmate` package was starting to get a bit polluted. This PR migrates each driver into a separate package, with clean separation between each. In addition: * Drivers are now initialized with a URL, avoiding the need to pass `*url.URL` to every method * Sqlite supports a cleaner syntax for relative paths * Driver tests now load their test URL from environment variables Public API of `dbmate` package has not changed (no changes to `main` package).
This commit is contained in:
Adrian Macneil
GitHub
parent
c907c3f5c6
commit
61771e386d
23 changed files with 1195 additions and 1078 deletions
287
pkg/driver/mysql/mysql.go
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287
pkg/driver/mysql/mysql.go
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@ -0,0 +1,287 @@
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package mysql
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import (
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"bytes"
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"database/sql"
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"fmt"
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"net/url"
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"strings"
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"github.com/amacneil/dbmate/pkg/dbmate"
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"github.com/amacneil/dbmate/pkg/dbutil"
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_ "github.com/go-sql-driver/mysql" // database/sql driver
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)
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func init() {
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dbmate.RegisterDriver(NewDriver, "mysql")
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}
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// Driver provides top level database functions
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type Driver struct {
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migrationsTableName string
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databaseURL *url.URL
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}
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// NewDriver initializes the driver
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func NewDriver(config dbmate.DriverConfig) dbmate.Driver {
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return &Driver{
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migrationsTableName: config.MigrationsTableName,
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databaseURL: config.DatabaseURL,
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}
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}
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func connectionString(u *url.URL) string {
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query := u.Query()
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query.Set("multiStatements", "true")
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host := u.Host
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protocol := "tcp"
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if query.Get("socket") != "" {
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protocol = "unix"
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host = query.Get("socket")
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query.Del("socket")
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} else if u.Port() == "" {
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// set default port
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host = fmt.Sprintf("%s:3306", host)
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}
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// Get decoded user:pass
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userPassEncoded := u.User.String()
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userPass, _ := url.QueryUnescape(userPassEncoded)
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// Build DSN w/ user:pass percent-decoded
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normalizedString := ""
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if userPass != "" { // user:pass can be empty
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normalizedString = userPass + "@"
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}
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// connection string format required by go-sql-driver/mysql
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normalizedString = fmt.Sprintf("%s%s(%s)%s?%s", normalizedString,
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protocol, host, u.Path, query.Encode())
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return normalizedString
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}
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// Open creates a new database connection
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func (drv *Driver) Open() (*sql.DB, error) {
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return sql.Open("mysql", connectionString(drv.databaseURL))
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}
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func (drv *Driver) openRootDB() (*sql.DB, error) {
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// clone databaseURL
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rootURL, err := url.Parse(drv.databaseURL.String())
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if err != nil {
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return nil, err
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}
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// connect to no particular database
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rootURL.Path = "/"
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return sql.Open("mysql", connectionString(rootURL))
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}
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func (drv *Driver) quoteIdentifier(str string) string {
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str = strings.Replace(str, "`", "\\`", -1)
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return fmt.Sprintf("`%s`", str)
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}
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// CreateDatabase creates the specified database
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func (drv *Driver) CreateDatabase() error {
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name := dbutil.DatabaseName(drv.databaseURL)
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fmt.Printf("Creating: %s\n", name)
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db, err := drv.openRootDB()
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if err != nil {
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return err
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}
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defer dbutil.MustClose(db)
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_, err = db.Exec(fmt.Sprintf("create database %s",
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drv.quoteIdentifier(name)))
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return err
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}
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// DropDatabase drops the specified database (if it exists)
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func (drv *Driver) DropDatabase() error {
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name := dbutil.DatabaseName(drv.databaseURL)
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fmt.Printf("Dropping: %s\n", name)
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db, err := drv.openRootDB()
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if err != nil {
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return err
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}
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defer dbutil.MustClose(db)
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_, err = db.Exec(fmt.Sprintf("drop database if exists %s",
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drv.quoteIdentifier(name)))
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return err
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}
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func (drv *Driver) mysqldumpArgs() []string {
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// generate CLI arguments
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args := []string{"--opt", "--routines", "--no-data",
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"--skip-dump-date", "--skip-add-drop-table"}
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if hostname := drv.databaseURL.Hostname(); hostname != "" {
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args = append(args, "--host="+hostname)
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}
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if port := drv.databaseURL.Port(); port != "" {
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args = append(args, "--port="+port)
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}
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if username := drv.databaseURL.User.Username(); username != "" {
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args = append(args, "--user="+username)
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}
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// mysql recommends against using environment variables to supply password
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// https://dev.mysql.com/doc/refman/5.7/en/password-security-user.html
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if password, set := drv.databaseURL.User.Password(); set {
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args = append(args, "--password="+password)
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}
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// add database name
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args = append(args, dbutil.DatabaseName(drv.databaseURL))
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return args
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}
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func (drv *Driver) schemaMigrationsDump(db *sql.DB) ([]byte, error) {
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migrationsTable := drv.quotedMigrationsTableName()
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// load applied migrations
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migrations, err := dbutil.QueryColumn(db,
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fmt.Sprintf("select quote(version) from %s order by version asc", migrationsTable))
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if err != nil {
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return nil, err
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}
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// build schema_migrations table data
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var buf bytes.Buffer
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buf.WriteString("\n--\n-- Dbmate schema migrations\n--\n\n" +
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fmt.Sprintf("LOCK TABLES %s WRITE;\n", migrationsTable))
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if len(migrations) > 0 {
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buf.WriteString(
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fmt.Sprintf("INSERT INTO %s (version) VALUES\n (", migrationsTable) +
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strings.Join(migrations, "),\n (") +
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");\n")
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}
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buf.WriteString("UNLOCK TABLES;\n")
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return buf.Bytes(), nil
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}
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// DumpSchema returns the current database schema
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func (drv *Driver) DumpSchema(db *sql.DB) ([]byte, error) {
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schema, err := dbutil.RunCommand("mysqldump", drv.mysqldumpArgs()...)
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if err != nil {
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return nil, err
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}
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migrations, err := drv.schemaMigrationsDump(db)
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if err != nil {
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return nil, err
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}
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schema = append(schema, migrations...)
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return dbutil.TrimLeadingSQLComments(schema)
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}
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// DatabaseExists determines whether the database exists
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func (drv *Driver) DatabaseExists() (bool, error) {
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name := dbutil.DatabaseName(drv.databaseURL)
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db, err := drv.openRootDB()
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if err != nil {
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return false, err
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}
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defer dbutil.MustClose(db)
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exists := false
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err = db.QueryRow("select true from information_schema.schemata "+
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"where schema_name = ?", name).Scan(&exists)
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if err == sql.ErrNoRows {
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return false, nil
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}
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return exists, err
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}
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// CreateMigrationsTable creates the schema_migrations table
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func (drv *Driver) CreateMigrationsTable(db *sql.DB) error {
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_, err := db.Exec(fmt.Sprintf("create table if not exists %s "+
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"(version varchar(255) primary key) character set latin1 collate latin1_bin",
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drv.quotedMigrationsTableName()))
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return err
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}
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// SelectMigrations returns a list of applied migrations
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// with an optional limit (in descending order)
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func (drv *Driver) SelectMigrations(db *sql.DB, limit int) (map[string]bool, error) {
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query := fmt.Sprintf("select version from %s order by version desc", drv.quotedMigrationsTableName())
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if limit >= 0 {
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query = fmt.Sprintf("%s limit %d", query, limit)
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}
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rows, err := db.Query(query)
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if err != nil {
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return nil, err
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}
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defer dbutil.MustClose(rows)
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migrations := map[string]bool{}
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for rows.Next() {
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var version string
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if err := rows.Scan(&version); err != nil {
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return nil, err
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}
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migrations[version] = true
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}
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if err = rows.Err(); err != nil {
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return nil, err
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}
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return migrations, nil
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}
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// InsertMigration adds a new migration record
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func (drv *Driver) InsertMigration(db dbutil.Transaction, version string) error {
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_, err := db.Exec(
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fmt.Sprintf("insert into %s (version) values (?)", drv.quotedMigrationsTableName()),
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version)
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return err
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}
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// DeleteMigration removes a migration record
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func (drv *Driver) DeleteMigration(db dbutil.Transaction, version string) error {
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_, err := db.Exec(
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fmt.Sprintf("delete from %s where version = ?", drv.quotedMigrationsTableName()),
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version)
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return err
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}
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// Ping verifies a connection to the database server. It does not verify whether the
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// specified database exists.
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func (drv *Driver) Ping() error {
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db, err := drv.openRootDB()
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if err != nil {
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return err
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}
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defer dbutil.MustClose(db)
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return db.Ping()
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}
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func (drv *Driver) quotedMigrationsTableName() string {
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return drv.quoteIdentifier(drv.migrationsTableName)
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}
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342
pkg/driver/mysql/mysql_test.go
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342
pkg/driver/mysql/mysql_test.go
Normal file
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@ -0,0 +1,342 @@
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package mysql
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import (
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"database/sql"
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"net/url"
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"os"
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"testing"
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"github.com/amacneil/dbmate/pkg/dbmate"
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"github.com/amacneil/dbmate/pkg/dbutil"
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"github.com/stretchr/testify/require"
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)
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func testMySQLDriver(t *testing.T) *Driver {
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u := dbutil.MustParseURL(os.Getenv("MYSQL_TEST_URL"))
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drv, err := dbmate.New(u).GetDriver()
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require.NoError(t, err)
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return drv.(*Driver)
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}
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func prepTestMySQLDB(t *testing.T) *sql.DB {
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drv := testMySQLDriver(t)
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// drop any existing database
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err := drv.DropDatabase()
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require.NoError(t, err)
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// create database
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err = drv.CreateDatabase()
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require.NoError(t, err)
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// connect database
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db, err := drv.Open()
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require.NoError(t, err)
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return db
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}
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func TestGetDriver(t *testing.T) {
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db := dbmate.New(dbutil.MustParseURL("mysql://"))
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drvInterface, err := db.GetDriver()
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require.NoError(t, err)
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// driver should have URL and default migrations table set
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drv, ok := drvInterface.(*Driver)
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require.True(t, ok)
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require.Equal(t, db.DatabaseURL.String(), drv.databaseURL.String())
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require.Equal(t, "schema_migrations", drv.migrationsTableName)
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}
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func TestConnectionString(t *testing.T) {
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t.Run("defaults", func(t *testing.T) {
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u, err := url.Parse("mysql://host/foo")
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require.NoError(t, err)
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require.Equal(t, "", u.Port())
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s := connectionString(u)
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require.Equal(t, "tcp(host:3306)/foo?multiStatements=true", s)
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})
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t.Run("custom", func(t *testing.T) {
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u, err := url.Parse("mysql://bob:secret@host:123/foo?flag=on")
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require.NoError(t, err)
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require.Equal(t, "123", u.Port())
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s := connectionString(u)
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require.Equal(t, "bob:secret@tcp(host:123)/foo?flag=on&multiStatements=true", s)
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})
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t.Run("special chars", func(t *testing.T) {
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u, err := url.Parse("mysql://duhfsd7s:123!@123!@@host:123/foo?flag=on")
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require.NoError(t, err)
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require.Equal(t, "123", u.Port())
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s := connectionString(u)
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require.Equal(t, "duhfsd7s:123!@123!@@tcp(host:123)/foo?flag=on&multiStatements=true", s)
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})
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t.Run("socket", func(t *testing.T) {
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// test with no user/pass
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u, err := url.Parse("mysql:///foo?socket=/var/run/mysqld/mysqld.sock&flag=on")
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require.NoError(t, err)
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require.Equal(t, "", u.Host)
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s := connectionString(u)
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require.Equal(t, "unix(/var/run/mysqld/mysqld.sock)/foo?flag=on&multiStatements=true", s)
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// test with user/pass
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u, err = url.Parse("mysql://bob:secret@fakehost/foo?socket=/var/run/mysqld/mysqld.sock&flag=on")
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require.NoError(t, err)
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s = connectionString(u)
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require.Equal(t, "bob:secret@unix(/var/run/mysqld/mysqld.sock)/foo?flag=on&multiStatements=true", s)
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})
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}
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func TestMySQLCreateDropDatabase(t *testing.T) {
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drv := testMySQLDriver(t)
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// drop any existing database
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err := drv.DropDatabase()
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require.NoError(t, err)
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// create database
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err = drv.CreateDatabase()
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require.NoError(t, err)
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// check that database exists and we can connect to it
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func() {
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db, err := drv.Open()
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require.NoError(t, err)
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defer dbutil.MustClose(db)
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err = db.Ping()
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require.NoError(t, err)
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}()
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// drop the database
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err = drv.DropDatabase()
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require.NoError(t, err)
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// check that database no longer exists
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func() {
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db, err := drv.Open()
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require.NoError(t, err)
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defer dbutil.MustClose(db)
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err = db.Ping()
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require.Error(t, err)
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require.Regexp(t, "Unknown database 'dbmate_test'", err.Error())
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}()
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}
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func TestMySQLDumpSchema(t *testing.T) {
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drv := testMySQLDriver(t)
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drv.migrationsTableName = "test_migrations"
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// prepare database
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db := prepTestMySQLDB(t)
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defer dbutil.MustClose(db)
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err := drv.CreateMigrationsTable(db)
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require.NoError(t, err)
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// insert migration
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err = drv.InsertMigration(db, "abc1")
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require.NoError(t, err)
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err = drv.InsertMigration(db, "abc2")
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require.NoError(t, err)
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// DumpSchema should return schema
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schema, err := drv.DumpSchema(db)
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require.NoError(t, err)
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require.Contains(t, string(schema), "CREATE TABLE `test_migrations`")
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require.Contains(t, string(schema), "\n-- Dump completed\n\n"+
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"--\n"+
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"-- Dbmate schema migrations\n"+
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"--\n\n"+
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"LOCK TABLES `test_migrations` WRITE;\n"+
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"INSERT INTO `test_migrations` (version) VALUES\n"+
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" ('abc1'),\n"+
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" ('abc2');\n"+
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"UNLOCK TABLES;\n")
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// DumpSchema should return error if command fails
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drv.databaseURL.Path = "/fakedb"
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schema, err = drv.DumpSchema(db)
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require.Nil(t, schema)
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require.EqualError(t, err, "mysqldump: [Warning] Using a password "+
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"on the command line interface can be insecure.\n"+
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"mysqldump: Got error: 1049: "+
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"Unknown database 'fakedb' when selecting the database")
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}
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func TestMySQLDatabaseExists(t *testing.T) {
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drv := testMySQLDriver(t)
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// drop any existing database
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err := drv.DropDatabase()
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require.NoError(t, err)
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// DatabaseExists should return false
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exists, err := drv.DatabaseExists()
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require.NoError(t, err)
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require.Equal(t, false, exists)
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// create database
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err = drv.CreateDatabase()
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require.NoError(t, err)
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// DatabaseExists should return true
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exists, err = drv.DatabaseExists()
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require.NoError(t, err)
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require.Equal(t, true, exists)
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}
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func TestMySQLDatabaseExists_Error(t *testing.T) {
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drv := testMySQLDriver(t)
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drv.databaseURL.User = url.User("invalid")
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|
||||
exists, err := drv.DatabaseExists()
|
||||
require.Error(t, err)
|
||||
require.Regexp(t, "Access denied for user 'invalid'@", err.Error())
|
||||
require.Equal(t, false, exists)
|
||||
}
|
||||
|
||||
func TestMySQLCreateMigrationsTable(t *testing.T) {
|
||||
drv := testMySQLDriver(t)
|
||||
drv.migrationsTableName = "test_migrations"
|
||||
|
||||
db := prepTestMySQLDB(t)
|
||||
defer dbutil.MustClose(db)
|
||||
|
||||
// migrations table should not exist
|
||||
count := 0
|
||||
err := db.QueryRow("select count(*) from test_migrations").Scan(&count)
|
||||
require.Error(t, err)
|
||||
require.Regexp(t, "Table 'dbmate_test.test_migrations' doesn't exist", err.Error())
|
||||
|
||||
// create table
|
||||
err = drv.CreateMigrationsTable(db)
|
||||
require.NoError(t, err)
|
||||
|
||||
// migrations table should exist
|
||||
err = db.QueryRow("select count(*) from test_migrations").Scan(&count)
|
||||
require.NoError(t, err)
|
||||
|
||||
// create table should be idempotent
|
||||
err = drv.CreateMigrationsTable(db)
|
||||
require.NoError(t, err)
|
||||
}
|
||||
|
||||
func TestMySQLSelectMigrations(t *testing.T) {
|
||||
drv := testMySQLDriver(t)
|
||||
drv.migrationsTableName = "test_migrations"
|
||||
|
||||
db := prepTestMySQLDB(t)
|
||||
defer dbutil.MustClose(db)
|
||||
|
||||
err := drv.CreateMigrationsTable(db)
|
||||
require.NoError(t, err)
|
||||
|
||||
_, err = db.Exec(`insert into test_migrations (version)
|
||||
values ('abc2'), ('abc1'), ('abc3')`)
|
||||
require.NoError(t, err)
|
||||
|
||||
migrations, err := drv.SelectMigrations(db, -1)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, true, migrations["abc1"])
|
||||
require.Equal(t, true, migrations["abc2"])
|
||||
require.Equal(t, true, migrations["abc2"])
|
||||
|
||||
// test limit param
|
||||
migrations, err = drv.SelectMigrations(db, 1)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, true, migrations["abc3"])
|
||||
require.Equal(t, false, migrations["abc1"])
|
||||
require.Equal(t, false, migrations["abc2"])
|
||||
}
|
||||
|
||||
func TestMySQLInsertMigration(t *testing.T) {
|
||||
drv := testMySQLDriver(t)
|
||||
drv.migrationsTableName = "test_migrations"
|
||||
|
||||
db := prepTestMySQLDB(t)
|
||||
defer dbutil.MustClose(db)
|
||||
|
||||
err := drv.CreateMigrationsTable(db)
|
||||
require.NoError(t, err)
|
||||
|
||||
count := 0
|
||||
err = db.QueryRow("select count(*) from test_migrations").Scan(&count)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, 0, count)
|
||||
|
||||
// insert migration
|
||||
err = drv.InsertMigration(db, "abc1")
|
||||
require.NoError(t, err)
|
||||
|
||||
err = db.QueryRow("select count(*) from test_migrations where version = 'abc1'").
|
||||
Scan(&count)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, 1, count)
|
||||
}
|
||||
|
||||
func TestMySQLDeleteMigration(t *testing.T) {
|
||||
drv := testMySQLDriver(t)
|
||||
drv.migrationsTableName = "test_migrations"
|
||||
|
||||
db := prepTestMySQLDB(t)
|
||||
defer dbutil.MustClose(db)
|
||||
|
||||
err := drv.CreateMigrationsTable(db)
|
||||
require.NoError(t, err)
|
||||
|
||||
_, err = db.Exec(`insert into test_migrations (version)
|
||||
values ('abc1'), ('abc2')`)
|
||||
require.NoError(t, err)
|
||||
|
||||
err = drv.DeleteMigration(db, "abc2")
|
||||
require.NoError(t, err)
|
||||
|
||||
count := 0
|
||||
err = db.QueryRow("select count(*) from test_migrations").Scan(&count)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, 1, count)
|
||||
}
|
||||
|
||||
func TestMySQLPing(t *testing.T) {
|
||||
drv := testMySQLDriver(t)
|
||||
|
||||
// drop any existing database
|
||||
err := drv.DropDatabase()
|
||||
require.NoError(t, err)
|
||||
|
||||
// ping database
|
||||
err = drv.Ping()
|
||||
require.NoError(t, err)
|
||||
|
||||
// ping invalid host should return error
|
||||
drv.databaseURL.Host = "mysql:404"
|
||||
err = drv.Ping()
|
||||
require.Error(t, err)
|
||||
require.Contains(t, err.Error(), "connect: connection refused")
|
||||
}
|
||||
|
||||
func TestMySQLQuotedMigrationsTableName(t *testing.T) {
|
||||
t.Run("default name", func(t *testing.T) {
|
||||
drv := testMySQLDriver(t)
|
||||
name := drv.quotedMigrationsTableName()
|
||||
require.Equal(t, "`schema_migrations`", name)
|
||||
})
|
||||
|
||||
t.Run("custom name", func(t *testing.T) {
|
||||
drv := testMySQLDriver(t)
|
||||
drv.migrationsTableName = "fooMigrations"
|
||||
|
||||
name := drv.quotedMigrationsTableName()
|
||||
require.Equal(t, "`fooMigrations`", name)
|
||||
})
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue