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postgres.go
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/
postgres.go
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package dialectquery
import "fmt"
type Postgres struct{}
var _ Querier = (*Postgres)(nil)
func (p *Postgres) CreateTable(tableName string) string {
q := `CREATE TABLE %s (
id serial NOT NULL,
version_id bigint NOT NULL,
is_applied boolean NOT NULL,
tstamp timestamp NULL default now(),
PRIMARY KEY(id)
)`
return fmt.Sprintf(q, tableName)
}
func (p *Postgres) InsertVersion(tableName string) string {
q := `INSERT INTO %s (version_id, is_applied) VALUES ($1, $2)`
return fmt.Sprintf(q, tableName)
}
func (p *Postgres) DeleteVersion(tableName string) string {
q := `DELETE FROM %s WHERE version_id=$1`
return fmt.Sprintf(q, tableName)
}
func (p *Postgres) GetMigrationByVersion(tableName string) string {
q := `SELECT tstamp, is_applied FROM %s WHERE version_id=$1 ORDER BY tstamp DESC LIMIT 1`
return fmt.Sprintf(q, tableName)
}
func (p *Postgres) ListMigrations(tableName string) string {
q := `SELECT version_id, is_applied from %s ORDER BY id DESC`
return fmt.Sprintf(q, tableName)
}