16. A system for constructing a database instruction, comprising: a memory including machine-executable instructions operable, when executed, to perform as a virtual query generation engine; a presentation interface; one or more processors operable to receive data from the presentation interface, execute the machine-executable instructions, and read and write to the memory, the one or more processors being further operable to: receive a user-generated parameter from a user interface; construct, by the virtual query generation engine, an information object based on an element of the user interface associated with the user-generated parameter, the information object including an object type and the user-generated parameter; associate, at runtime, the user-generated parameter with a first template instruction comprising a metadata mapping file of a data model for a database and having more than one variable tokens, each variable token having one or more variable token types, a first variable token occurring more than once in the first template instruction, and a first occurrence of the first variable token having a different variable token type than a second occurrence of the first variable token; determine that a section of a plurality of additional template instructions is defined as optional based on detecting an optional begin token and an optional end token that offset the section of additional template instructions, wherein each of the additional template instructions are associated with a respective variable; match the information object to one or more of the variable tokens in the first template instruction; generate a database instruction by at least substituting the one or more of the variable tokens in the first template instruction with the user generated parameter and by excluding the additional template instructions from the database instruction based on determining that the information object does not include user-generated parameters for any of the respective variables associated with the additional template instructions; and query the database using the database instruction.
16. A system for constructing a database instruction, comprising: a memory including machine-executable instructions operable, when executed, to perform as a virtual query generation engine; a presentation interface; one or more processors operable to receive data from the presentation interface, execute the machine-executable instructions, and read and write to the memory, the one or more processors being further operable to: receive a user-generated parameter from a user interface; construct, by the virtual query generation engine, an information object based on an element of the user interface associated with the user-generated parameter, the information object including an object type and the user-generated parameter; associate, at runtime, the user-generated parameter with a first template instruction comprising a metadata mapping file of a data model for a database and having more than one variable tokens, each variable token having one or more variable token types, a first variable token occurring more than once in the first template instruction, and a first occurrence of the first variable token having a different variable token type than a second occurrence of the first variable token; determine that a section of a plurality of additional template instructions is defined as optional based on detecting an optional begin token and an optional end token that offset the section of additional template instructions, wherein each of the additional template instructions are associated with a respective variable; match the information object to one or more of the variable tokens in the first template instruction; generate a database instruction by at least substituting the one or more of the variable tokens in the first template instruction with the user generated parameter and by excluding the additional template instructions from the database instruction based on determining that the information object does not include user-generated parameters for any of the respective variables associated with the additional template instructions; and query the database using the database instruction. 23. The system of claim 16 , the one or more processors being further operable to: receive the user-generated parameter from the presentation interface; and construct the information object in response to receiving the user-generated parameter, wherein the one or more processors is operable, in accordance with the virtual query generation engine, to process the machine-readable document template and the information object to substitute at least one of the variable tokens with the user generated parameter.