func generatePKWhere(buf *sqlparser.TrackedBuffer, pkIndex *schema.Index) {
for i := 0; i < len(pkIndex.Columns); i++ {
if i != 0 {
buf.WriteString(" and ")
}
buf.Myprintf("%s = %a", pkIndex.Columns[i], strconv.FormatInt(int64(i), 10))
}
}
// FormatImpossible is a callback function used by TrackedBuffer
// to generate a modified version of the query where all selects
// have impossible where clauses. It overrides a few node types
// and passes the rest down to the default FormatNode.
func FormatImpossible(buf *sqlparser.TrackedBuffer, node sqlparser.SQLNode) {
switch node := node.(type) {
case *sqlparser.Select:
buf.Myprintf("select %v from %v where 1 != 1", node.SelectExprs, node.From)
case *sqlparser.JoinTableExpr:
if node.Join == sqlparser.AST_LEFT_JOIN || node.Join == sqlparser.AST_RIGHT_JOIN {
// ON clause is requried
buf.Myprintf("%v %s %v on 1 != 1", node.LeftExpr, node.Join, node.RightExpr)
} else {
buf.Myprintf("%v %s %v", node.LeftExpr, node.Join, node.RightExpr)
}
default:
node.Format(buf)
}
}