Tushare基础调用及处理

创建索引：

db.daily.createIndex({code:1,date:1,'index':1})

mongodb查看表有几列：

map = function() {

for (var key in this) {

emit(key, {count : 1});

}};

reduce = function(key, emits) {

total = 0;

for (var i in emits) {

total += emits[i].count;

}

return {"count" : total};

}

db.runCommand({"mapreduce" : "表名", "map" : map, "reduce" : reduce,"out":"result"})

db.result.find()

错误：UserWarning: Attempting to set identical left==right results in singular transformations; automatically expanding. left=0.0, right=0.0 'left=%s, right=%s') % (left, right))

是因为参数过大，数据不够

巴特西

Tushare基础调用及处理

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