使用database前必須在編輯窗口中
Create Database創建數據庫。
1)單擊創建數據庫-> 2)插入（多次單擊）-> 3)選擇
您可以看到保存為dashboard儀表板的值。
1) 新建database table
CREATE TABLE RANDOMNUM( TIMESTAMP INT PRIMARY KEY NOT NULL, VALUE INT NOT NULL, BOOL INT NOT NULL)
2) 插入 table
var randomNum = Math.round(Math.random()*100);
var largeBool = (randomNum > 50)?1:0;
var newMsg = {
"topic": "INSERT INTO RANDOMNUM VALUES ( " + msg.payload + ", " + randomNum + ", " + largeBool + ")"
}
return newMsg;
3) 刪除30秒內的 資料
DELETE FROM RANDOMNUM WHERE TIMESTAMP <= strftime('%s','now', '-30 seconds')*1000
4)刪除24小時內的 資料
DELETE FROM RANDOMNUM WHERE TIMESTAMP <= strftime('%s','now', '-24 hours')*1000
5)刪除7日內的 資料
DELETE FROM RANDOMNUM WHERE TIMESTAMP <= strftime('%s','now', '-7 days')*1000
6)更新 資料
UPDATE RANDOMNUM SET BOOL = 1 WHERE VALUE > 20 AND BOOL = 0
7)計數 資料
SELECT COUNT(*) FROM RANDOMNUM
7)選擇 資料
SELECT * FROM RANDOMNUM ORDER BY TIMESTAMP DESC LIMIT 100;
8) Dash Board template的Template 板模 設定20筆資料
<table style="width:100%">
<tr>
<th>Index</th>
<th>Timestamp</th>
<th>Value</th>
<th>Bool</th>
</tr>
<tr ng-repeat="x in msg.payload | limitTo:20">
<td>{{$index}}</td>
<td>{{msg.payload[$index].TIMESTAMP}}</td>
<td>{{msg.payload[$index].VALUE}}</td>
<td>{{msg.payload[$index].BOOL}}</td>
</tr>
</table>
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