mirror of
https://github.com/TECHNOFAB11/dbmate.git
synced 2025-12-11 23:50:04 +01:00
103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
package postgres
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import (
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"database/sql"
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"fmt"
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"github.com/adrianmacneil/dbmate/driver/shared"
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pq "github.com/lib/pq"
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"net/url"
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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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}
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// Open creates a new database connection
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func (postgres Driver) Open(u *url.URL) (*sql.DB, error) {
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return sql.Open("postgres", u.String())
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}
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// postgresExec runs a sql statement on the "postgres" database
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func (postgres Driver) postgresExec(u *url.URL, statement string) error {
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// connect to postgres database
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postgresURL := *u
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postgresURL.Path = "postgres"
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db, err := postgres.Open(&postgresURL)
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if err != nil {
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return err
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}
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defer db.Close()
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// run statement
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_, err = db.Exec(statement)
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return err
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}
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// CreateDatabase creates the specified database
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func (postgres Driver) CreateDatabase(u *url.URL) error {
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database := shared.DatabaseName(u)
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fmt.Printf("Creating: %s\n", database)
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return postgres.postgresExec(u, fmt.Sprintf("CREATE DATABASE %s",
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pq.QuoteIdentifier(database)))
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}
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// DropDatabase drops the specified database (if it exists)
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func (postgres Driver) DropDatabase(u *url.URL) error {
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database := shared.DatabaseName(u)
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fmt.Printf("Dropping: %s\n", database)
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return postgres.postgresExec(u, fmt.Sprintf("DROP DATABASE IF EXISTS %s",
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pq.QuoteIdentifier(database)))
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}
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// HasMigrationsTable returns true if the schema_migrations table exists
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func (postgres Driver) HasMigrationsTable(db *sql.DB) (bool, error) {
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return false, fmt.Errorf("not implemented")
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}
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// CreateMigrationsTable creates the schema_migrations table
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func (postgres Driver) CreateMigrationsTable(db *sql.DB) error {
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_, err := db.Exec(`CREATE TABLE IF NOT EXISTS schema_migrations (
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version varchar(255) PRIMARY KEY)`)
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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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func (postgres Driver) SelectMigrations(db *sql.DB) (map[string]struct{}, error) {
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rows, err := db.Query("SELECT version FROM schema_migrations")
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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migrations := map[string]struct{}{}
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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] = struct{}{}
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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 (postgres Driver) InsertMigration(db shared.Transaction, version string) error {
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_, err := db.Exec("INSERT INTO schema_migrations (version) VALUES ($1)", 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 (postgres Driver) DeleteMigration(db shared.Transaction, version string) error {
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_, err := db.Exec("DELETE FROM schema_migrations WHERE version = $1", version)
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return err
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}
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