fix mysql tenant database schema cleanup

scripts/query_sql.go

@@ -0,0 +1,61 @@
+//go:build ignore
+
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"os"
+	"strings"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+func main() {
+	dsn := strings.TrimPrefix(os.Getenv("IM_MYSQL_DSN"), "mysql://")
+	query := os.Getenv("IM_SQL_QUERY")
+	if dsn == "" || query == "" {
+		fatal("IM_MYSQL_DSN and IM_SQL_QUERY are required")
+	}
+	db, err := sql.Open("mysql", dsn)
+	if err != nil {
+		fatal(err)
+	}
+	defer db.Close()
+	rows, err := db.Query(query)
+	if err != nil {
+		fatal(err)
+	}
+	defer rows.Close()
+
+	cols, err := rows.Columns()
+	if err != nil {
+		fatal(err)
+	}
+	fmt.Println(strings.Join(cols, "\t"))
+	for rows.Next() {
+		values := make([]sql.NullString, len(cols))
+		scan := make([]any, len(cols))
+		for i := range values {
+			scan[i] = &values[i]
+		}
+		if err := rows.Scan(scan...); err != nil {
+			fatal(err)
+		}
+		out := make([]string, len(cols))
+		for i, value := range values {
+			if value.Valid {
+				out[i] = value.String
+			}
+		}
+		fmt.Println(strings.Join(out, "\t"))
+	}
+	if err := rows.Err(); err != nil {
+		fatal(err)
+	}
+}
+
+func fatal(v any) {
+	fmt.Fprintln(os.Stderr, v)
+	os.Exit(1)
+}