* op.Interval(duration) shortcut

 * op.SetDbParam(tx, arg, value) helper

CHANGELOG.txt

@@ -1,3 +1,7 @@
+v0.13.0
+ * op.Interval(duration) shortcut
+ * op.SetDbParam(tx, arg, value) helper
+
 v0.12.3
  * experimental lorm.DisableLocks()/lorm.EnableLocks() functions
 

conn.go

@@ -2,6 +2,7 @@ package lorm
 
 import (
 	"database/sql"
+	"strings"
 
 	"github.com/jackc/pgx/v4"
 )
@@ -29,3 +30,15 @@ var disableLocks = false
 
 func DisableLocks() { disableLocks = true }
 func EnableLocks()  { disableLocks = false }
+
+func SetDbParam(tx *Tx, arg, value string) (err error) {
+	value = strings.ReplaceAll(value, "'", "")
+	// Prepared statement doesn't work with SET. FIXME: add more sql safety
+	query := "SET " + arg + " = '" + value + "'"
+	if tx == nil {
+		_, err = conn.Exec(query)
+	} else {
+		_, err = tx.Exec(query)
+	}
+	return
+}

op/op.go

@@ -2,8 +2,10 @@ package op
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
 	"sync/atomic"
+	"time"
 )
 
 var escapeSpecialReplacer = strings.NewReplacer(
@@ -168,3 +170,8 @@ func List(v ...Expr) Expr {
 func HasPrefix(v string) string { return EscapeSpecialSymbols(v) + "%" }
 func HasSuffix(v string) string { return "%" + EscapeSpecialSymbols(v) }
 func Contains(v string) string  { return "%" + EscapeSpecialSymbols(v) + "%" }
+
+// Interval transform time.Duration into interval representation
+func Interval(dur time.Duration) string {
+	return strconv.Itoa(int(dur.Seconds())) + "s"
+}