分组:test db.runCommand( { mapreduce : "test", map : function() { var nameKey = this.name; kws.forEach(function(kw){ var key = kw.key; if(nameKey.indexOf(key) == 0){ nameKey = nameKey.substring(key.length, nameKey.length); } }); var key = nameKey; var value = { count: 1 }; emit( key, value ); }, reduce : function(key, values) { var reducedObject = { name: key, count:0 }; values.forEach( function(value) { reducedObject.name = reducedObject.name; reducedObject.count += value.count; } ); return reducedObject; }, scope:{kws:[{key:"xm: "},{key:"xm:"}]}, out: { reduce: "test_group" }, verbose:true } ); travel_forum 分组:title db.runCommand( { mapreduce : "travel_forum", map : function() { var titleKey = this.title; kws.forEach(function(kw){ var key = kw.key; if(titleKey.indexOf(key) == 0){ titleKey = titleKey.substring(key.length, titleKey.length); } }); var key = titleKey; var value = 1; emit( key, value ); }, reduce : function(key, values) { var count = 0; values.forEach( function(value) { count += value; } ); return count; }, scope:{kws:[{key:"回应: "},{key:"回复:"}]}, out: { reduce: "travel_forum_group" }, verbose:true } );
mongodb的mapreduce实现分组统计数量
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