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在 Automation Script 中我们通常使用 mbo 对象来操作数据，但有时候当数据量较大时，使用 mbo 对象来操作数据会比较慢。这时候，我们可以使用 JDBC 的方式来直接访问数据库，从而提高操作数据的效率。

下面看看使用 JavaScript 脚本怎么实现在 Automation Script 中访问数据库：

1. 首先需要倒入必要的包

load('nashorn:mozilla_compat.js');
importPackage(Packages.psdi.server);
importPackage(Packages.psdi.security);
importPackage(Packages.psdi.security);
importPackage(Packages.java.sql);

2. 获取 Connection 实例

var mxServer = MXServer.getMXServer();
var connKey = mxServer.getSystemUserInfo().getConnectionKey();
var conn = mxServer.getDBManager().getConnection(connKey);

3. 执行 SQL 语句并处理结果

var wos = [];var stmt = conn.createStatement();
var rs = stmt.executeQuery("select * from workorder order by WORKORDERID");
var i = 0;
while(rs.next()) {var wo = {};if (i < (pageNum - 1) * pageSize) {continue;}if (i >= pageNum * pageSize) {break;}i++;wo.wonum = rs.getString("WONUM");wo.workorderid = rs.getString("WORKORDERID");wo.description = rs.getString("DESCRIPTION");wos.push(wo);
}rs.close()
stmt.close()
conn.close()

4. 以 json 格式返回

var responseBody = JSON.stringify(wos);

完整代码

下面看一下完整的 Automation Script 代码：

load('nashorn:mozilla_compat.js');
importPackage(Packages.psdi.server);
importPackage(Packages.psdi.security);
importPackage(Packages.psdi.security);
importPackage(Packages.java.sql);var pageNum = request.getQueryParam("pageNum");
var pageSize = request.getQueryParam("pageSize");var mxServer = MXServer.getMXServer();
var connKey = mxServer.getSystemUserInfo().getConnectionKey();
var conn = mxServer.getDBManager().getConnection(connKey);var wos = [];var stmt = conn.createStatement();
var rs = stmt.executeQuery("select * from workorder order by WORKORDERID");
var i = 0;
while(rs.next()) {var wo = {};if (i < (pageNum - 1) * pageSize) {continue;}if (i >= pageNum * pageSize) {break;}i++;wo.wonum = rs.getString("WONUM");wo.workorderid = rs.getString("WORKORDERID");wo.description = rs.getString("DESCRIPTION");wos.push(wo);
}rs.close()
stmt.close()
conn.close()var responseBody = JSON.stringify(wos);

测试

使用 vscode 的 REST Client 插件来测试这个 Automation Script

### 
# call automation script
GET {{base_url}}/api/script/<automation script>?apikey={{api_key}}&lean=1&pageNum=1&pageSize=10
Content-Type: application/json

返回结果类似如下：

[{"wonum": "1638","workorderid": "1","description": "Check Leaking Condensate Return Pump"},...
]