first commit

qry_delete.go

@@ -0,0 +1,74 @@
+package pgm
+
+import (
+	"context"
+
+	"github.com/jackc/pgx/v5"
+)
+
+type (
+	deleteQry struct {
+		table     string
+		condition []Conditioner
+		args      []any
+		debug     bool
+	}
+)
+
+func (t *Table) Delete() WhereOrExec {
+	qb := &deleteQry{
+		table: t.Name,
+		debug: t.debug,
+	}
+
+	return qb
+}
+
+func (q *deleteQry) Where(cond ...Conditioner) WhereOrExec {
+	q.condition = append(q.condition, cond...)
+	return q
+}
+
+func (q *deleteQry) Exec(ctx context.Context) error {
+	_, err := poolPGX.Load().Exec(ctx, q.String(), q.args...)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (q *deleteQry) ExecTx(ctx context.Context, tx pgx.Tx) error {
+	_, err := tx.Exec(ctx, q.String(), q.args...)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (q *deleteQry) String() string {
+	sb := getSB()
+	defer putSB(sb)
+
+	n := len("DELETE FROM ") + len(q.table) + 20
+	sb.Grow(n)
+
+	// DELETE
+	sb.WriteString("DELETE FROM ")
+	sb.WriteString(q.table)
+
+	// WHERE
+	if len(q.condition) > 0 {
+		sb.WriteString(" WHERE ")
+		var argIdx int
+		for i, c := range q.condition {
+			argIdx = len(q.args)
+			if i > 0 {
+				sb.WriteString(" AND ")
+			}
+			sb.WriteString(c.Condition(&q.args, argIdx))
+		}
+	}
+
+	return sb.String()
+}