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postgresql.go
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postgresql.go
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package pop
import (
"fmt"
"io"
"os"
"os/exec"
"strconv"
"strings"
"sync"
_ "github.com/lib/pq"
. "github.com/markbates/pop/columns"
"github.com/markbates/pop/fizz"
"github.com/markbates/pop/fizz/translators"
"github.com/pkg/errors"
)
var _ dialect = &postgresql{}
type postgresql struct {
translateCache map[string]string
mu sync.Mutex
ConnectionDetails *ConnectionDetails
}
func (p *postgresql) Details() *ConnectionDetails {
return p.ConnectionDetails
}
func (p *postgresql) Create(s store, model *Model, cols Columns) error {
keyType := model.PrimaryKeyType()
switch keyType {
case "int":
cols.Remove("id")
id := struct {
ID int `db:"id"`
}{}
w := cols.Writeable()
query := fmt.Sprintf("INSERT INTO %s (%s) VALUES (%s) returning id", model.TableName(), w.String(), w.SymbolizedString())
Log(query)
stmt, err := s.PrepareNamed(query)
if err != nil {
return errors.Wrapf(err, "postgres error preparing insert statement %s", query)
}
err = stmt.Get(&id, model.Value)
if err != nil {
return errors.Wrap(err, "postgres error inserting record")
}
model.setID(id.ID)
return nil
case "UUID":
return genericCreate(s, model, cols)
}
return errors.Errorf("can not use %s as a primary key type!", keyType)
}
func (p *postgresql) Update(s store, model *Model, cols Columns) error {
return errors.Wrap(genericUpdate(s, model, cols), "postgres update")
}
func (p *postgresql) Destroy(s store, model *Model) error {
return errors.Wrap(genericDestroy(s, model), "postgres destroy")
}
func (p *postgresql) SelectOne(s store, model *Model, query Query) error {
return errors.Wrap(genericSelectOne(s, model, query), "postgres select one")
}
func (p *postgresql) SelectMany(s store, models *Model, query Query) error {
return errors.Wrap(genericSelectMany(s, models, query), "postgres select many")
}
func (p *postgresql) CreateDB() error {
// createdb -h db -p 5432 -U postgres enterprise_development
deets := p.ConnectionDetails
cmd := exec.Command("createdb", "-e", "-h", deets.Host, "-p", deets.Port, "-U", deets.User, deets.Database)
Log(strings.Join(cmd.Args, " "))
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stderr
cmd.Stdout = os.Stdout
err := cmd.Run()
if err != nil {
return errors.Wrapf(err, "error creating PostgreSQL database %s", deets.Database)
}
fmt.Printf("created database %s\n", deets.Database)
return nil
}
func (p *postgresql) DropDB() error {
deets := p.ConnectionDetails
cmd := exec.Command("dropdb", "-e", "-h", deets.Host, "-p", deets.Port, "-U", deets.User, deets.Database)
Log(strings.Join(cmd.Args, " "))
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stderr
cmd.Stdout = os.Stdout
err := cmd.Run()
if err != nil {
return errors.Wrapf(err, "error dropping PostgreSQL database %s", deets.Database)
}
fmt.Printf("dropped database %s\n", deets.Database)
return nil
}
func (m *postgresql) URL() string {
c := m.ConnectionDetails
if c.URL != "" {
return c.URL
}
s := "postgres://%s:%s@%s:%s/%s?sslmode=disable"
return fmt.Sprintf(s, c.User, c.Password, c.Host, c.Port, c.Database)
}
func (m *postgresql) MigrationURL() string {
return m.URL()
}
func (p *postgresql) TranslateSQL(sql string) string {
defer p.mu.Unlock()
p.mu.Lock()
if csql, ok := p.translateCache[sql]; ok {
return csql
}
curr := 1
out := make([]byte, 0, len(sql))
for i := 0; i < len(sql); i++ {
if sql[i] == '?' {
str := "$" + strconv.Itoa(curr)
for _, char := range str {
out = append(out, byte(char))
}
curr += 1
} else {
out = append(out, sql[i])
}
}
csql := string(out)
p.translateCache[sql] = csql
return csql
}
func (p *postgresql) FizzTranslator() fizz.Translator {
return translators.NewPostgres()
}
func (p *postgresql) Lock(fn func() error) error {
return fn()
}
func (p *postgresql) DumpSchema(w io.Writer) error {
cmd := exec.Command("pg_dump", "-s", fmt.Sprintf("--dbname=%s", p.URL()))
Log(strings.Join(cmd.Args, " "))
cmd.Stdout = w
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
return err
}
fmt.Printf("dumped schema for %s\n", p.Details().Database)
return nil
}
func (p *postgresql) LoadSchema(r io.Reader) error {
cmd := exec.Command("psql", p.URL())
in, err := cmd.StdinPipe()
if err != nil {
return err
}
go func() {
defer in.Close()
io.Copy(in, r)
}()
Log(strings.Join(cmd.Args, " "))
err = cmd.Start()
if err != nil {
return err
}
err = cmd.Wait()
if err != nil {
return err
}
fmt.Printf("loaded schema for %s\n", p.Details().Database)
return nil
}
func (p *postgresql) TruncateAll(tx *Connection) error {
return tx.RawQuery(pgTruncate).Exec()
}
func newPostgreSQL(deets *ConnectionDetails) dialect {
cd := &postgresql{
ConnectionDetails: deets,
translateCache: map[string]string{},
mu: sync.Mutex{},
}
return cd
}
const pgTruncate = `DO
$func$
BEGIN
EXECUTE
(SELECT 'TRUNCATE TABLE '
|| string_agg(quote_ident(schemaname) || '.' || quote_ident(tablename), ', ')
|| ' CASCADE'
FROM pg_tables
WHERE schemaname = 'public'
);
END
$func$;`