Windows Microsoft azure移动服务脚本
我无法在Windows Azure中支持我的移动服务请求。 问题: 我如何检查服务器对客户端的响应是否有任何记录或编号。我有这个,但它不起作用Windows Microsoft azure移动服务脚本,windows,node.js,azure,azure-mobile-services,Windows,Node.js,Azure,Azure Mobile Services,我无法在Windows Azure中支持我的移动服务请求。 问题: 我如何检查服务器对客户端的响应是否有任何记录或编号。我有这个,但它不起作用 function read(query, user, request) { if (query.take(recordCount) > 0) { request.respond(200, "Exist"); } else { request.respond(500, "ERROR"); } 下面是查看查询结果的示例: functi
function read(query, user, request) {
if (query.take(recordCount) > 0) {
request.respond(200, "Exist");
} else {
request.respond(500, "ERROR");
}
下面是查看查询结果的示例:
function read(query, user, request) {
request.execute( {success: function(results) {
console.log(results);
request.respond(200, results);
}, error: function(error) {
console.log('error: ', error);
request.respond(500);
}});
}
function read(query, user, request) {
query.includeTotalCount(); // tell me how many items there are
query.take(0); // but don't bother returning them
request.execute({
success: function(results) {
if (results.totalCount > 0) {
request.respond(200, { status: 'Item exists' });
} else {
request.respond(500, { status: 'ERROR' });
}
}
});
}
在success块中,您可以检查以确保结果不是空的,如果有结果,则用200回复,如果没有,则用500回复。如果您不想执行完全读取查询,您也可以使用mssql模块执行自定义sql语句(即从tablename中选择count(*)。除了@Chris建议的之外,您还可以使用
includeTotalCount()
函数以及获取(0)
(如果您只关心结果的数量,而不关心结果本身),请仅统计查询中将返回的项:
function read(query, user, request) {
request.execute( {success: function(results) {
console.log(results);
request.respond(200, results);
}, error: function(error) {
console.log('error: ', error);
request.respond(500);
}});
}
function read(query, user, request) {
query.includeTotalCount(); // tell me how many items there are
query.take(0); // but don't bother returning them
request.execute({
success: function(results) {
if (results.totalCount > 0) {
request.respond(200, { status: 'Item exists' });
} else {
request.respond(500, { status: 'ERROR' });
}
}
});
}
或者,如果您真正想知道的是是否有任何结果,您甚至可以跳过includeTotalCount
调用,只需通过take(1)
调用强制响应返回最多1个结果:
function read(query, user, request) {
query.take(1); // return at most one item
request.execute({
success: function(results) {
if (results.length > 0) {
request.respond(200, { status: 'Item exists' });
} else {
request.respond(500, { status: 'ERROR' });
}
}
});
}
,如何检查结果是否为非空?Results!==null&&Results.length!=0如果调用了
success
处理程序,则可以假定结果为非空。