🎨 基于内容块属性动态建立对应数据库表结构 https://github.com/siyuan-note/siyuan/issues/7521

kernel/sql/attribute_view.go

@@ -0,0 +1,220 @@
+// SiYuan - Build Your Eternal Digital Garden
+// Copyright (c) 2020-present, b3log.org
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package sql
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/88250/gulu"
+	"github.com/siyuan-note/filelock"
+	"github.com/siyuan-note/logging"
+	"github.com/siyuan-note/siyuan/kernel/util"
+)
+
+type AttributeView struct {
+	Attributes []string // 属性列表，即表格的列名
+	Blocks     []string // 存储的块 ID 列表，即表格的行记录
+}
+
+// syncAttributeViewTableFromJSON 从 JSON 文件同步属性视图表，用于数据同步后将属性视图 JSON 文件同步到数据库。
+func syncAttributeViewTableFromJSON(tableID string) (err error) {
+	avJSONPath := getAttributeViewJSONPath(tableID)
+	data, err := filelock.ReadFile(avJSONPath)
+	if nil != err {
+		logging.LogErrorf("read attribute view table failed: %s", err)
+		return
+	}
+
+	var attributeView AttributeView
+	if err = gulu.JSON.UnmarshalJSON(data, &attributeView); nil != err {
+		logging.LogErrorf("unmarshal attribute view table failed: %s", err)
+		return
+	}
+
+	oldColumns, err := getAttributeViewTableColumns(tableID)
+	if nil != err {
+		return
+	}
+
+	// 删除多余的列
+	for _, column := range oldColumns {
+		if !gulu.Str.Contains(column, attributeView.Attributes) {
+			if err = dropAttributeViewTableColumn(tableID, column); nil != err {
+				return
+			}
+		}
+	}
+
+	// 添加缺失的列
+	for _, column := range attributeView.Attributes {
+		if !gulu.Str.Contains(column, oldColumns) {
+			if err = addAttributeViewTableColumn(tableID, column); nil != err {
+				return
+			}
+		}
+	}
+
+	// 删除多余的记录
+	oldIDs, err := getAttributeViewRecordIDs(tableID)
+	if nil != err {
+		return
+	}
+	for _, id := range oldIDs {
+		if !gulu.Str.Contains(id, attributeView.Blocks) {
+			if err = deleteAttributeViewTableBlock(tableID, id); nil != err {
+				return
+			}
+		}
+	}
+
+	// 添加缺失的记录
+	for _, id := range attributeView.Blocks {
+		if !gulu.Str.Contains(id, oldIDs) {
+			if err = addAttributeViewTableBlock(tableID, id); nil != err {
+				return
+			}
+		}
+	}
+
+	return
+}
+
+// syncAttributeViewTableToJSON 同步属性视图表到 JSON 文件，用于将数据库中的属性视图持久化到 JSON 文件中。
+func syncAttributeViewTableToJSON(tableID string) (err error) {
+	columns, err := getAttributeViewTableColumns(tableID)
+	if nil != err {
+		return
+	}
+
+	ids, err := getAttributeViewRecordIDs(tableID)
+	if nil != err {
+		return
+	}
+
+	attributeView := &AttributeView{Attributes: columns, Blocks: ids}
+	data, err := gulu.JSON.MarshalJSON(attributeView)
+	if nil != err {
+		logging.LogErrorf("marshal attribute view table failed: %s", err)
+		return
+	}
+
+	avJSONPath := getAttributeViewJSONPath(tableID)
+	if err = filelock.WriteFile(avJSONPath, data); nil != err {
+		logging.LogErrorf("save attribute view table failed: %s", err)
+		return
+	}
+	return
+}
+
+func getAttributeViewJSONPath(tableID string) string {
+	return filepath.Join(util.DataDir, "storage", "av", tableID+".json")
+}
+
+func addAttributeViewTableBlock(tableID string, id string) (err error) {
+	_, err = db.Exec("INSERT INTO `av_"+tableID+"` (id) VALUES (?)", id)
+	if nil != err {
+		logging.LogErrorf("add av table block [%s] failed: %s", id, err)
+		return
+	}
+	return
+}
+
+func deleteAttributeViewTableBlock(tableID string, id string) (err error) {
+	_, err = db.Exec("DELETE FROM `av_"+tableID+"` WHERE id = ?", id)
+	if nil != err {
+		logging.LogErrorf("delete av table block [%s] failed: %s", id, err)
+		return
+	}
+	return
+}
+
+func getAttributeViewRecordIDs(tableID string) (ret []string, err error) {
+	rows, err := db.Query("SELECT id FROM `av_" + tableID + "`")
+	if nil != err {
+		logging.LogErrorf("get record ids failed: %s", err)
+		return
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id string
+		err = rows.Scan(&id)
+		if nil != err {
+			logging.LogErrorf("get record ids failed: %s", err)
+			return
+		}
+		ret = append(ret, id)
+	}
+	return
+}
+
+func getAttributeViewTableColumns(tableID string) (ret []string, err error) {
+	rows, err := db.Query("SHOW COLUMNS FROM `av_" + tableID + "`")
+	if nil != err {
+		logging.LogErrorf("get columns failed: %s", err)
+		return
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var column string
+		err = rows.Scan(&column)
+		if nil != err {
+			logging.LogErrorf("get columns failed: %s", err)
+			return
+		}
+		ret = append(ret, column)
+	}
+	return
+}
+
+func dropAttributeViewTableColumn(tableID string, column string) (err error) {
+	_, err = db.Exec("ALTER TABLE `av_" + tableID + "` DROP COLUMN `" + column + "`")
+	if nil != err {
+		logging.LogErrorf("drop column [%s] failed: %s", column, err)
+		return
+	}
+	return
+}
+
+func addAttributeViewTableColumn(tableID string, column string) (err error) {
+	_, err = db.Exec("ALTER TABLE `av_" + tableID + "` ADD COLUMN `" + column + "`")
+	if nil != err {
+		logging.LogErrorf("add column [%s] failed: %s", column, err)
+		return
+	}
+	return
+}
+
+func dropAttributeViewTable(tableID string) (err error) {
+	_, err = db.Exec("DROP TABLE IF EXISTS `av_" + tableID + "`")
+	if nil != err {
+		logging.LogErrorf("drop table [%s] failed: %s", tableID, err)
+		return
+	}
+	return
+}
+
+func createAttributeViewTable(tableID string, column []string) (err error) {
+	_, err = db.Exec("CREATE TABLE IF NOT EXISTS `av_" + tableID + "` (id, " + strings.Join(column, ", ") + ")")
+	if nil != err {
+		logging.LogErrorf("create table [%s] failed: %s", tableID, err)
+		return
+	}
+	return
+}