Created
June 19, 2019 18:04
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dump #sql tables in #golang
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| package main | |
| import ( | |
| "database/sql" | |
| "flag" | |
| "fmt" | |
| "log" | |
| _ "github.com/go-sql-driver/mysql" | |
| ) | |
| var ( | |
| dbUser = flag.String("user", "user", "username") | |
| dbPass = flag.String("pass", "pass", "password") | |
| dbHost = flag.String("host", "tcp(127.0.0.1:3306)", "hostname") | |
| dbName = flag.String("name", "base", "database") | |
| ) | |
| func showTables(db *sql.DB) ([]string, error) { | |
| rows0, err := db.Query("show tables") | |
| if err != nil { | |
| return nil, err | |
| } | |
| defer rows0.Close() | |
| n := 0 | |
| tables := make([]string, 0) | |
| for rows0.Next() { | |
| var s string | |
| n++ | |
| err = rows0.Scan(&s) | |
| if err != nil { | |
| return nil, fmt.Errorf("rows.Scan %d failed: %v", n, err) | |
| } | |
| tables = append(tables, s) | |
| } | |
| return tables, nil | |
| } | |
| type Desc struct { | |
| Name string | |
| Type string | |
| Null string | |
| Key *string | |
| Default *string | |
| Extra *string | |
| } | |
| func describe(db *sql.DB, table string) (map[string]*Desc, error) { | |
| rows0, err := db.Query("describe " + table) | |
| if err != nil { | |
| return nil, err | |
| } | |
| defer rows0.Close() | |
| n := 0 | |
| descs := make(map[string]*Desc) | |
| for rows0.Next() { | |
| var d Desc | |
| n++ | |
| err = rows0.Scan(&d.Name, &d.Type, &d.Null, &d.Key, &d.Default, &d.Extra) | |
| if err != nil { | |
| return nil, fmt.Errorf("rows.Scan %d failed: %v", n, err) | |
| } | |
| descs[d.Name] = &d | |
| } | |
| return descs, nil | |
| } | |
| func main() { | |
| flag.Parse() | |
| dbSrc := fmt.Sprintf("%s:%s@%s/%s?parseTime=true", *dbUser, *dbPass, *dbHost, *dbName) | |
| db, err := sql.Open("mysql", dbSrc) | |
| if err != nil { | |
| log.Fatalf("sql.Open failed: %v", err) | |
| } | |
| defer db.Close() | |
| // sql.Open() does not establish any connections to the database ... | |
| err = db.Ping() | |
| if err != nil { | |
| log.Fatalf("db.Ping failed: %v", err) | |
| } | |
| tables, err := showTables(db) | |
| if err != nil { | |
| log.Fatalf("showTables failed: %v\n", err) | |
| } | |
| for _, table := range tables { | |
| ds, err := describe(db, table) | |
| if err != nil { | |
| log.Fatalf("describe failed: %v\n", err) | |
| } | |
| fmt.Printf("%s:\n", table) | |
| for _, d := range ds { | |
| fmt.Printf("\t%-20s %s\n", d.Name, d.Type) | |
| } | |
| } | |
| } |
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