Add QueryArgs

sql.go

@@ -0,0 +1,29 @@
+package pgx
+
+import (
+	"strconv"
+)
+
+// QueryArgs is a container for arguments to an SQL query. It is helpful when
+// building SQL statements where the number of arguments is variable.
+type QueryArgs []interface{}
+
+var placeholders []string
+
+func init() {
+	placeholders = make([]string, 64)
+
+	for i := 1; i < 64; i++ {
+		placeholders[i] = "$" + strconv.FormatInt(int64(i), 10)
+	}
+}
+
+// Append adds a value to qa and returns the placeholder value for the
+// argument. e.g. $1, $2, etc.
+func (qa *QueryArgs) Append(v interface{}) string {
+	*qa = append(*qa, v)
+	if len(*qa) < len(placeholders) {
+		return placeholders[len(*qa)]
+	}
+	return "$" + strconv.FormatInt(int64(len(*qa)), 10)
+}