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stmt.go
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stmt.go
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package pg
import (
"time"
)
// Not thread-safe.
type Stmt struct {
db *DB
_cn *conn
name string
columns []string
err error
}
func prepare(db *DB, cn *conn, q string) (*Stmt, error) {
name := cn.GenId()
writeParseDescribeSyncMsg(cn.buf, name, q)
if err := cn.Flush(); err != nil {
db.freeConn(cn, err)
return nil, err
}
columns, err := readParseDescribeSync(cn)
if err != nil {
db.freeConn(cn, err)
return nil, err
}
stmt := &Stmt{
db: db,
_cn: cn,
name: name,
columns: columns,
}
return stmt, nil
}
func (stmt *Stmt) conn() (*conn, error) {
if stmt._cn == nil {
return nil, errStmtClosed
}
stmt._cn.SetReadTimeout(stmt.db.opt.ReadTimeout)
stmt._cn.SetWriteTimeout(stmt.db.opt.WriteTimeout)
return stmt._cn, nil
}
func (stmt *Stmt) Exec(args ...interface{}) (res *Result, err error) {
backoff := defaultBackoff
for i := 0; i < 3; i++ {
var cn *conn
cn, err = stmt.conn()
if err != nil {
return nil, err
}
res, err = extQuery(cn, stmt.name, args...)
if !canRetry(err) {
break
}
time.Sleep(backoff)
backoff *= 2
}
if err != nil {
stmt.setErr(err)
}
return
}
func (stmt *Stmt) ExecOne(args ...interface{}) (*Result, error) {
res, err := stmt.Exec(args...)
if err != nil {
return nil, err
}
return assertOneAffected(res)
}
func (stmt *Stmt) Query(coll Collection, args ...interface{}) (res *Result, err error) {
backoff := defaultBackoff
for i := 0; i < 3; i++ {
var cn *conn
cn, err = stmt.conn()
if err != nil {
break
}
res, err = extQueryData(cn, stmt.name, coll, stmt.columns, args...)
if !canRetry(err) {
break
}
time.Sleep(backoff)
backoff *= 2
}
if err != nil {
stmt.setErr(err)
}
return
}
func (stmt *Stmt) QueryOne(record interface{}, args ...interface{}) (*Result, error) {
res, err := stmt.Query(&singleRecordCollection{record}, args...)
if err != nil {
return nil, err
}
return assertOneAffected(res)
}
func (stmt *Stmt) setErr(e error) {
stmt.err = e
}
func (stmt *Stmt) Close() error {
if stmt._cn == nil {
return errStmtClosed
}
err := stmt.db.freeConn(stmt._cn, stmt.err)
stmt._cn = nil
return err
}
func extQuery(cn *conn, name string, args ...interface{}) (*Result, error) {
if err := writeBindExecuteMsg(cn.buf, name, args...); err != nil {
return nil, err
}
if err := cn.Flush(); err != nil {
return nil, err
}
return readExtQuery(cn)
}
func extQueryData(cn *conn, name string, coll Collection, columns []string, args ...interface{}) (*Result, error) {
if err := writeBindExecuteMsg(cn.buf, name, args...); err != nil {
return nil, err
}
if err := cn.Flush(); err != nil {
return nil, err
}
return readExtQueryData(cn, coll, columns)
}