markType() - Specifies the data type

field

This string argument specifies an attribute name.

type

This argument specifies a data type, or null to remove the data type. The following data types are supported:

• $int
• $long
• $number
• $date
• $timestamp
• $string: length
• $binary: length

Example 1: Mark the 'x' field as integer type, and sort by 'x' in ascending order.

db.c.insert({x:-100})
db.c.insert({x:-10})
db.c.markType({x:"$int"})
db.c.find().sort({x:1})

Sample output:

Row 1:
{
"_id":{"$oid":"51f08bbdeefadf1d37d08bd9"},
"x":-100
}
Row 2:
{
"_id":{"$oid":"51f08bc3eefadf1d37d08bda"},
"x":-10
}

Example 2: Mark the 'x' field as string type, and sort by 'x' in ascending order

db.c.markType({x:["$string",20]})
db.c.find().sort({x:1})

Sample output:

Row 1:
{
"_id":{"$oid":"51f08bc3eefadf1d37d08bda"},
"x":-10
}
Row 2:
{
"_id":{"$oid":"51f08bbdeefadf1d37d08bd9"},
"x":-100
}