SAP HANA 4. Retrieve Data from SAP HANA.(Helloworld)

1、操作步骤

1.1Add an SAPHANA System.没有SAP HANA环境想要学习的同学，可以考虑申请SAP HANA Trials，试用30天，体验一下。附链接

http://global.sap.com/software-free-trials/index.epx?url_id=text-us-header-freetrials

 

 

 

 

 

 

1.2Add a Repository Workspace

1.3新建XS Project，OPENSAP1如下图所示

 

1.4新建.xsapp和.xsaccess。其中.xsapp文件内容为空，作为应用程序描述符（Application descriptor）标记web内容的root；.xsaccess文件作为Application access文件，一是Exposes Web content，二是Setsuser/clientauthentication mechanism。根据OPEN SAP公开课程，在.xsaccess中写代码如下：

{
"exposed":true,
"authentication":[
{
"method":"LogonTicket"
},
{
"method":"Basic"
}
]
}



1.5新建XS JavaScript Source File，RetrieveData.xsjs，添加代码如下


$.response.contentType= "text/html";
var output ="Hello World! <br><br>";
var conn =$.db.getConnection();
var pstmt =conn.prepareStatement("select * from DUMMY");
var rs =pstmt.executeQuery();
if (!rs.next()) {
$.response.setBody("Failed to retrieve data");
$.response.status =$.net.http.INTERNAL_SERVER_ERROR;
}
else {
output = output +"This is the response from my SQL: "
+ rs.getString(1);
}
rs.close();
pstmt.close();
conn.close();
$.response.setBody(output);





1.6将 Project OPENSAP1 Team→share Project、commit、activate，在浏览器中输入http://<Myserver>:8000/WorkShop/sessiona/RetrieveData.xsjs
 
 
2、发现错误及解决办法
2.1在浏览器中输入http://<Myserver>:8000/WorkShop/sessiona/RetrieveData.xsjs，回车后发现如下错误：
500 -Internal server error
An error occurredduring the processing of your request.
Data might be lost. 
 

 
2.2在SCN中链接如下内容http://scn.sap.com/thread/3398193#

下载SPS6的SAP_HANA_Developer_Guide_en.pdf，将.xsaccess内容修改为

{"exposed" : true, "authentication" : [ { "method": "Basic" } ] }









修改完，Team Commit→Activate，然后浏览器中输入
http://<Myserver>:8000/WorkShop/sessiona/RetrieveData.xsjs，显示如下：

程序运行成功。