Golang NullString.String方法代碼示例

func main() {
	db, err := sql.Open("postgres", "user=postgres password=pass dbname=mecab sslmode=disable")
	checkErr(err)
	//データの検索
	//rows, err := db.Query("SELECT * FROM words LIMIT 3")
	rows, err := db.Query("SELECT * FROM words WHERE first_char IS NULL")
	checkErr(err)

	for rows.Next() {
		var surface string
		var original string
		var reading string
		var first_c sql.NullString
		var last_c sql.NullString
		err = rows.Scan(&surface, &original, &reading, &first_c, &last_c)
		checkErr(err)
		/*
			fmt.Println(surface)
			fmt.Println(original)
			fmt.Println(reading)
			fmt.Println(reading[0:3])
			fmt.Println(reading[len(reading)-3 : len(reading)])
			fmt.Println(first_c)
			fmt.Println(last_c)
		*/

		first_c.String = reading[0:3]
		last_c.String = reading[len(reading)-3 : len(reading)]

		//データの更新
		stmt, err := db.Prepare("update words set first_char=$1, last_char=$2 where original=$3")
		checkErr(err)

		first_c.Valid = true
		last_c.Valid = true
		_, err = stmt.Exec(first_c.String, last_c.String, original)
		checkErr(err)

		/*
			affect, err := res.RowsAffected()
			checkErr(err)
			fmt.Println(affect)
		*/
	}

	db.Close()
	fmt.Println("finish")

}

func (w *DatabaseWorld) SaveThing(thing *Thing) (ok bool) {
	tabletext, err := json.Marshal(thing.Table)
	if err != nil {
		log.Println("Error serializing table data for thing", thing.Id, ":", err.Error())
		return false
	}

	var parent sql.NullInt64
	if thing.Parent != 0 {
		parent.Int64 = int64(thing.Parent)
		parent.Valid = true
	}
	var owner sql.NullInt64
	if thing.Owner != 0 && thing.Type.HasOwner() {
		owner.Int64 = int64(thing.Owner)
		owner.Valid = true
	}
	var program sql.NullString
	if thing.Program != nil {
		program.String = thing.Program.Text
		program.Valid = true
	}

	// TODO: save the allow list
	_, err = w.db.Exec("UPDATE thing SET name = $1, parent = $2, owner = $3, adminlist = $4, denylist = $5, tabledata = $6, program = $7 WHERE id = $8",
		thing.Name, parent, owner, thing.AdminList, thing.DenyList,
		types.JsonText(tabletext), program, thing.Id)
	if err != nil {
		log.Println("Error saving a thing", thing.Id, ":", err.Error())
		return false
	}
	return true
}

func checkStringForNull(eventStr string, event *sql.NullString) {
	if len(eventStr) == 0 {
		event.Valid = false
	} else {
		event.String = eventStr
		event.Valid = true
	}
}

func main() {
	c := configFromFile()
	s := slack.New(c.SlackToken)
	db, err := sql.Open("mysql", c.Datasource)
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	err = updateChannels(s, db)
	if err != nil {
		log.Fatal(err)
	}

	err = updateUsers(s, db)
	if err != nil {
		log.Fatal(err)
	}

	rows, err := db.Query("SELECT id, name, latest FROM channels")
	if err != nil {
		log.Fatal(err)
	}
	defer rows.Close()

	for rows.Next() {
		var id string
		var name string
		var latest sql.NullString

		if err := rows.Scan(&id, &name, &latest); err != nil {
			log.Fatal(err)
		}
		fmt.Printf("import history: #%s\n", name)
		if !latest.Valid {
			latest.String = ""
		}
		l, err := addChannelHistory(s, db, id, latest.String)
		if err != nil {
			log.Fatal(err)
		}
		if l != "" {
			_, err = db.Exec(`UPDATE channels SET latest = ? WHERE id = ?`, l, id)
			if err != nil {
				log.Fatal(err)
			}
		}
	}
}

func (h Hstore) Value() (driver.Value, error) {
	hstore := hstore.Hstore{Map: map[string]sql.NullString{}}
	if len(h) == 0 {
		return nil, nil
	}

	for key, value := range h {
		var s sql.NullString
		if value != nil {
			s.String = *value
			s.Valid = true
		}
		hstore.Map[key] = s
	}
	return hstore.Value()
}

func (db *SQLDB) CreateContainer(container Container, ttl time.Duration) (SavedContainer, error) {
	if !(isValidCheckID(container.ContainerIdentifier) || isValidStepID(container.ContainerIdentifier)) {
		return SavedContainer{}, ErrInvalidIdentifier
	}

	tx, err := db.conn.Begin()
	if err != nil {
		return SavedContainer{}, err
	}

	defer tx.Rollback()

	checkSource, err := json.Marshal(container.CheckSource)
	if err != nil {
		return SavedContainer{}, err
	}

	envVariables, err := json.Marshal(container.EnvironmentVariables)
	if err != nil {
		return SavedContainer{}, err
	}

	user := container.User

	interval := fmt.Sprintf("%d second", int(ttl.Seconds()))

	if container.PipelineName != "" && container.PipelineID == 0 {
		// containers that belong to some pipeline must be identified by pipeline ID not name
		return SavedContainer{}, errors.New("container metadata must include pipeline ID")
	}
	var pipelineID sql.NullInt64
	if container.PipelineID != 0 {
		pipelineID.Int64 = int64(container.PipelineID)
		pipelineID.Valid = true
	}

	var resourceID sql.NullInt64
	if container.ResourceID != 0 {
		resourceID.Int64 = int64(container.ResourceID)
		resourceID.Valid = true
	}

	var resourceTypeVersion string
	if container.ResourceTypeVersion != nil {
		resourceTypeVersionBytes, err := json.Marshal(container.ResourceTypeVersion)
		if err != nil {
			return SavedContainer{}, err
		}
		resourceTypeVersion = string(resourceTypeVersionBytes)
	}

	var buildID sql.NullInt64
	if container.BuildID != 0 {
		buildID.Int64 = int64(container.BuildID)
		buildID.Valid = true
	}

	workerName := container.WorkerName
	if workerName == "" {
		workerName = container.WorkerName
	}

	var attempts sql.NullString
	if len(container.Attempts) > 0 {
		attemptsBlob, err := json.Marshal(container.Attempts)
		if err != nil {
			return SavedContainer{}, err
		}
		attempts.Valid = true
		attempts.String = string(attemptsBlob)
	}

	var imageResourceSource sql.NullString
	if container.ImageResourceSource != nil {
		marshaled, err := json.Marshal(container.ImageResourceSource)
		if err != nil {
			return SavedContainer{}, err
		}

		imageResourceSource.String = string(marshaled)
		imageResourceSource.Valid = true
	}

	var imageResourceType sql.NullString
	if container.ImageResourceType != "" {
		imageResourceType.String = container.ImageResourceType
		imageResourceType.Valid = true
	}

	_, err = tx.Exec(`
		INSERT INTO containers (handle, resource_id, step_name, pipeline_id, build_id, type, worker_name, expires_at, ttl, check_type, check_source, plan_id, working_directory, env_variables, attempts, stage, image_resource_type, image_resource_source, process_user, resource_type_version)
		VALUES ($1, $2, $3, $4, $5, $6, $7, NOW() + $8::INTERVAL, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20)`,
		container.Handle,
		resourceID,
		container.StepName,
		pipelineID,
		buildID,
		container.Type.String(),
		workerName,
		interval,
//.........這裏部分代碼省略.........

//查看題庫題目，不顯示題目答案
func FuncListBankQuestion2(bankId int64, parse common.ListParam, aid int64) ([]QUESTION, common.Pagiation, error) {
	rs := []QUESTION{}
	args := []interface{}{bankId}
	args = append(args, aid)

	//	answerFilter := ""
	//	if aid!=0{
	//		answerFilter = " and a.answer_key=?"
	//	}
	statusFilter := ""
	//1答對，0答錯，-1未答
	if parse.Status != "" {
		statusFilter = " and a.add1=?"
		s := parse.Status
		if parse.Status == "-1" {
			statusFilter = " and a.status=?"
			s = "N"
		}
		args = append(args, s)
	}

	typeFilter := ""
	if parse.Type != 0 {
		typeFilter = " and q.type=?"
		args = append(args, parse.Type)
	}
	if parse.Pa.Pn < 1 || parse.Pa.Ps < 1 {
		parse.Pa.Pn = 1
		parse.Pa.Ps = 10
	}
	start := (parse.Pa.Pn - 1) * parse.Pa.Ps
	end := parse.Pa.Ps

	conn := dbMgr.DbConn()
	tx, err := conn.Begin()
	if err != nil {
		return rs, parse.Pa, err
	}
	sql_ := fmt.Sprintf(`select SQL_CALC_FOUND_ROWS q.TID, q.NAME, q.BANK_ID, q.PID, q.TAG, q.DESCRIPTION, q.DURATION, q.SCORE, q.Q_ANALYZE, q.TYPE,q.Q_OPTION, q.UID, q.UNAME,q2b.score,q2b.ext,q2b.tid,q2b.seq,q.desc2,a.tid,a.status,a.content,a.paper_snapshot,a.answer_snapshot from
	ebs_answer a left join ebs_question q on q.tid=a.qid left join ebs_q2b q2b on q2b.tid=a.q2b_id and q2b.bank_id=?
	where a.answer_key=? %s order by q2b.seq asc limit %d,%d`, statusFilter+typeFilter, start, end)
	if aid == 0 {
		sql_ = fmt.Sprintf(`select SQL_CALC_FOUND_ROWS q.TID, q.NAME, q.BANK_ID, q.PID, q.TAG, q.DESCRIPTION, q.DURATION, q.SCORE, q.Q_ANALYZE, q.TYPE,q.Q_OPTION, q.UID, q.UNAME,q2b.score,q2b.ext,q2b.tid,q2b.seq,q.desc2,a.tid,a.status,a.content,a.paper_snapshot,a.answer_snapshot
	from ebs_question q join ebs_q2b q2b on q2b.bank_id=? and q2b.q_id=q.tid left join ebs_answer a on a.answer_key=? and a.q2b_id=q2b.tid where 1=1 %s order by q2b.seq asc limit %d,%d`, statusFilter+typeFilter, start, end)
	}
	log.D("%v", sql_)
	if rows, err := tx.Query(sql_, args...); err != nil {
		tx.Commit()
		return rs, parse.Pa, err
	} else {
		columns := []string{"TID", "NAME", "BANK_ID", "PID", "TAG", "DESCRIPTION", "DURATION", "SCORE", "Q_ANALYZE", "TYPE",
			"Q_OPTION", "UID", "UNAME", "SCORE"}
		for rows.Next() {
			vals := []interface{}{}
			b := QUESTION{}
			for _, v := range columns {
				(&b).GetFieldByColumn(v, &vals)
			}
			var ext, desc2, aStatus, aContent, paperSnapshot, answerSnapshot sql.NullString
			var q2bId sql.NullInt64
			var q2bSeq, aIdRes sql.NullInt64
			vals = append(vals, &ext, &q2bId, &q2bSeq, &desc2, &aIdRes, &aStatus, &aContent, &paperSnapshot, &answerSnapshot)
			if err := rows.Scan(vals...); err != nil {
				log.E("scan err:%v", err)
			}
			qParse := QUESTION{}
			json.Unmarshal([]byte(paperSnapshot.String), &qParse)
			if qParse.Tid != nil {
				log.D("qParse:%v", qParse.ToString())
				b = qParse
				bb, _ := json.Marshal(qParse.Ext)
				ext.String = string(bb)
			}

			b.Q2bId = q2bId.Int64
			b.Q2bSeq = q2bSeq.Int64
			if b.TYPE != nil {
				if *b.TYPE == 35 {
					b.DESCRIPTION = &desc2.String
				}
			}
			if aid != 0 {
				b.Extra = map[string]interface{}{"aid": aIdRes.Int64, "aStatus": aStatus.String, "aContent": aContent.String}
			}
			if ext.String != "" {
				extParse := EXT{}
				json.Unmarshal([]byte(ext.String), &extParse)
				b.SCORE = &extParse.Score
				b.DURATION = &extParse.Duration
				b.Ext = extParse
			}
			rs = append(rs, b)
		}
	}

	if err := tx.QueryRow(`select FOUND_ROWS()`).Scan(&parse.Pa.Total); err != nil {
		tx.Commit()
		return rs, parse.Pa, err
	}
//.........這裏部分代碼省略.........

func (db *SQLDB) CreateContainer(container Container, ttl time.Duration) (Container, error) {
	if !isValidID(container.ContainerIdentifier) {
		return Container{}, ErrInvalidIdentifier
	}

	tx, err := db.conn.Begin()
	if err != nil {
		return Container{}, err
	}

	checkSource, err := json.Marshal(container.CheckSource)
	if err != nil {
		return Container{}, err
	}

	envVariables, err := json.Marshal(container.EnvironmentVariables)
	if err != nil {
		return Container{}, err
	}

	user := container.User

	interval := fmt.Sprintf("%d second", int(ttl.Seconds()))

	var pipelineID sql.NullInt64
	if container.PipelineName != "" {
		pipeline, err := db.GetPipelineByTeamNameAndName(atc.DefaultTeamName, container.PipelineName)
		if err != nil {
			return Container{}, fmt.Errorf("failed to find pipeline: %s", err.Error())
		}
		pipelineID.Int64 = int64(pipeline.ID)
		pipelineID.Valid = true
	}

	var resourceID sql.NullInt64
	if container.ResourceID != 0 {
		resourceID.Int64 = int64(container.ResourceID)
		resourceID.Valid = true
	}

	var buildID sql.NullInt64
	if container.BuildID != 0 {
		buildID.Int64 = int64(container.BuildID)
		buildID.Valid = true
	}

	workerName := container.WorkerName
	if workerName == "" {
		workerName = container.WorkerName
	}

	var attempts sql.NullString
	if len(container.Attempts) > 0 {
		attemptsBlob, err := json.Marshal(container.Attempts)
		if err != nil {
			return Container{}, err
		}
		attempts.Valid = true
		attempts.String = string(attemptsBlob)
	}

	var imageResourceSource sql.NullString
	if container.ImageResourceSource != nil {
		marshaled, err := json.Marshal(container.ImageResourceSource)
		if err != nil {
			return Container{}, err
		}

		imageResourceSource.String = string(marshaled)
		imageResourceSource.Valid = true
	}

	var imageResourceType sql.NullString
	if container.ImageResourceType != "" {
		imageResourceType.String = container.ImageResourceType
		imageResourceType.Valid = true
	}

	defer tx.Rollback()

	_, err = tx.Exec(`
		INSERT INTO containers (handle, resource_id, step_name, pipeline_id, build_id, type, worker_name, expires_at, check_type, check_source, plan_id, working_directory, env_variables, attempts, stage, image_resource_type, image_resource_source, process_user)
		VALUES ($1, $2, $3, $4, $5, $6,  $7, NOW() + $8::INTERVAL, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18)`,
		container.Handle,
		resourceID,
		container.StepName,
		pipelineID,
		buildID,
		container.Type.String(),
		workerName,
		interval,
		container.CheckType,
		checkSource,
		string(container.PlanID),
		container.WorkingDirectory,
		envVariables,
		attempts,
		string(container.Stage),
		imageResourceType,
		imageResourceSource,
//.........這裏部分代碼省略.........

func (db *SQLDB) FindContainerByIdentifier(id ContainerIdentifier) (Container, bool, error) {
	err := deleteExpired(db)
	if err != nil {
		return Container{}, false, err
	}

	var imageResourceSource sql.NullString
	if id.ImageResourceSource != nil {
		marshaled, err := json.Marshal(id.ImageResourceSource)
		if err != nil {
			return Container{}, false, err
		}

		imageResourceSource.String = string(marshaled)
		imageResourceSource.Valid = true
	}

	var imageResourceType sql.NullString
	if id.ImageResourceType != "" {
		imageResourceType.String = id.ImageResourceType
		imageResourceType.Valid = true
	}

	var containers []Container

	selectQuery := `
		SELECT ` + containerColumns + `
		FROM containers c ` + containerJoins + `
		`

	conditions := []string{}
	params := []interface{}{}

	if isValidCheckID(id) {
		checkSourceBlob, err := json.Marshal(id.CheckSource)
		if err != nil {
			return Container{}, false, err
		}

		conditions = append(conditions, "resource_id = $1")
		params = append(params, id.ResourceID)

		conditions = append(conditions, "check_type = $2")
		params = append(params, id.CheckType)

		conditions = append(conditions, "check_source = $3")
		params = append(params, checkSourceBlob)

		conditions = append(conditions, "stage = $4")
		params = append(params, string(id.Stage))
	} else if isValidStepID(id) {
		conditions = append(conditions, "build_id = $1")
		params = append(params, id.BuildID)

		conditions = append(conditions, "plan_id = $2")
		params = append(params, string(id.PlanID))

		conditions = append(conditions, "stage = $3")
		params = append(params, string(id.Stage))
	} else {
		return Container{}, false, ErrInvalidIdentifier
	}

	if imageResourceSource.Valid && imageResourceType.Valid {
		conditions = append(conditions, fmt.Sprintf("image_resource_source = $%d", len(params)+1))
		params = append(params, imageResourceSource.String)

		conditions = append(conditions, fmt.Sprintf("image_resource_type = $%d", len(params)+1))
		params = append(params, imageResourceType.String)
	} else {
		conditions = append(conditions, "image_resource_source IS NULL")
		conditions = append(conditions, "image_resource_type IS NULL")
	}

	selectQuery += "WHERE " + strings.Join(conditions, " AND ")

	rows, err := db.conn.Query(selectQuery, params...)
	if err != nil {
		return Container{}, false, err
	}

	for rows.Next() {
		container, err := scanContainer(rows)
		if err != nil {
			return Container{}, false, nil
		}
		containers = append(containers, container)
	}

	switch len(containers) {
	case 0:
		return Container{}, false, nil

	case 1:
		return containers[0], true, nil

	default:
		return Container{}, false, ErrMultipleContainersFound
	}
}

func CreateNullString(s string) sql.NullString {
	var ns sql.NullString
	ns.Valid = true
	ns.String = s
	return ns
}

func GenerateTestSuiteHandler(w http.ResponseWriter, r *http.Request) {
	DontCache(&w)

	// Generate a test suite based on the category IDs given by the user: of the
	// category IDs that are live and have a route back to the "root" of the
	// test suite hierarchy based on the category IDs given, this generates the
	// JavaScript code necessary to add the categories and tests to the test
	// framework running in the user's browser

	// Sanity-check for given category IDs: it must be a comma-delimited list of
	// integers, or * (which denotes all live categories in the category table)
	categoryIDs := mux.Vars(r)["catids"]
	if categoryIDs == "*" {
		// It's enough just to find the top-level categories here: the recursive
		// query we run below will find all of the live child categories we also
		// need to include in the test suite execution
		if err := db.QueryRow("SELECT '{' || array_to_string(array_agg(id),',') || '}' AS categories FROM category WHERE parent IS NULL AND live = true").Scan(&categoryIDs); err != nil {
			log.Panicf("Unable to get list of top-level categories: %s\n", err)
		}
	} else if regexp.MustCompile("^[0-9]+(,[0-9]+)*$").MatchString(categoryIDs) {
		categoryIDs = "{" + categoryIDs + "}"
	} else {
		log.Panic("Malformed category IDs supplied")
	}

	w.Header().Set("Content-Type", "text/javascript")
	fmt.Fprintln(w, "// Automatically-generated BrowserAudit test suite\n")

	// The table returned by this query is sorted by the order in which the
	// categories and then tests are to be executed; the hierarchy is correct by
	// the time it gets here, and so can be printed line-by-line with no further
	// processing of the resulting table

	// Suggestion for using WITH RECURSIVE courtesy of:
	// http://blog.timothyandrew.net/blog/2013/06/24/recursive-postgres-queries/
	// (note: WITH RECURSIVE is Postgres-specific)
	rows, err := db.Query(`
		WITH RECURSIVE touched_parent_categories AS (
			SELECT unnest($1::int[]) AS id
			UNION
			SELECT category.parent AS id FROM category, touched_parent_categories tpc WHERE tpc.id = category.id AND category.parent IS NOT NULL
		), touched_child_categories AS (
			SELECT unnest($1::int[]) AS id
			UNION
			SELECT category.id FROM category, touched_child_categories tcc WHERE category.parent = tcc.id
		), touched_categories AS (
			SELECT id FROM touched_parent_categories
			UNION
			SELECT id FROM touched_child_categories
		), hierarchy AS (
			(
				SELECT 'c' as type, id, title, description, NULL::test_behaviour AS behaviour, NULL::varchar AS test_function, NULL::smallint AS timeout, parent, array[execute_order] AS execute_order
				FROM category
				WHERE parent IS NULL AND live = true AND id IN (SELECT id FROM touched_categories)
			) UNION (
				SELECT e.type, e.id, e.title, e.description, e.behaviour, e.test_function, e.timeout, e.parent, (h.execute_order || e.execute_order)
				FROM (
					SELECT 't' as type, id, title, NULL::varchar AS description, behaviour, test_function, timeout, parent, execute_order
					FROM test
					WHERE live = true AND parent IN (SELECT id FROM touched_categories)
					UNION
					SELECT 'c' as type, id, title, description, NULL::test_behaviour AS behaviour, NULL::varchar AS test_function, NULL::smallint AS timeout, parent, execute_order
					FROM category
					WHERE live = true AND id IN (SELECT id FROM touched_categories)
				) e, hierarchy h
				WHERE e.parent = h.id AND h.type = 'c'
			)
		)
		SELECT type, id, title, description, behaviour, test_function, timeout, parent FROM hierarchy ORDER BY execute_order`, categoryIDs)

	if err != nil {
		log.Fatal(err)
	}

	for rows.Next() {
		var rowType string
		var id int
		var title string
		var description sql.NullString
		var behaviour sql.NullString
		var testFunctionInvocation sql.NullString
		var timeoutNullable sql.NullInt64
		var parentNullable sql.NullInt64

		// NULL description -> empty string (only the case for categories, which
		// doesn't matter because they aren't written out for categories in the
		// JavaScript below)
		description.String = ""

		// NULL behaviour -> empty string (only the case for categories, which
		// doesn't matter because they aren't written out for categories in the
		// JavaScript below)
		behaviour.String = ""

		// NULL test_function -> empty string (only the case for
		// categories, which doesn't matter because they aren't written out for
		// categories in the JavaScript below)
		testFunctionInvocation.String = ""

		if err := rows.Scan(&rowType, &id, &title, &description, &behaviour, &testFunctionInvocation, &timeoutNullable, &parentNullable); err != nil {
//.........這裏部分代碼省略.........

func setString(s *sql.NullString, v string) {
	if v != "" {
		s.Valid = true
		s.String = v
	}
}