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https://github.com/mongodb/mongo.git
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45 lines
776 B
JavaScript
45 lines
776 B
JavaScript
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t = db.mr_sort;
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t.drop()
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t.ensureIndex( { x : 1 } )
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t.insert( { x : 1 } )
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t.insert( { x : 10 } )
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t.insert( { x : 2 } )
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t.insert( { x : 9 } )
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t.insert( { x : 3 } )
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t.insert( { x : 8 } )
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t.insert( { x : 4 } )
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t.insert( { x : 7 } )
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t.insert( { x : 5 } )
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t.insert( { x : 6 } )
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m = function(){
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emit( "a" , this.x )
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}
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r = function( k , v ){
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return Array.sum( v )
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}
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res = t.mapReduce( m , r );
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x = res.convertToSingleObject();
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res.drop();
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assert.eq( { "a" : 55 } , x , "A1" )
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res = t.mapReduce( m , r , { query : { x : { $lt : 3 } } } )
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x = res.convertToSingleObject();
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res.drop();
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assert.eq( { "a" : 3 } , x , "A2" )
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res = t.mapReduce( m , r , { sort : { x : 1 } , limit : 2 } );
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x = res.convertToSingleObject();
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res.drop();
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assert.eq( { "a" : 3 } , x , "A3" )
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