database - How can I identify this "search syntax" or "query language"?

Question

Can anyone identify this 'search syntax' or 'query language' ? I am looking for a more complete specification.

• There is one operator: =
• All strings are case-insensitive, limited to 7-bit
• Whitespace is significant
• Queries are of the form: column=value
• & is a query seperator, leading to column1=value1&column2=value2 for an INTERSECTION
• Data typing is implicit, and has at least strings, booleans, and positive decimal values
• Positive decimal numbers have syntax similar to the following:
  • value=-10.0 returns all results with value less-than-or-equal to 10
  • value=10+ returns all results with value greater-than-or-equal to 10
  • value=1:10.0 returns all results between 1 and 10, inclusively
• Booleans:
  • False can be represented as : bool=0,bool=f,bool=false
  • True can be represented as: bool=0, bool=t,bool=true
• Strings:
  • Do not need to be wrapped in quotes, quotes are ignored
  • ? is a single-character wildcard, * is a multi-character (can be empty) wildcard

What I've looked at so far:

1. Lucene, which uses : for seperator, and is more complex syntatically
2. SQL where-clauses which use far more extensive operators
3. HQL and .QL (and others from Wikipedia's query pages) - however, this is significantly less object based.

Given the complexity, including implicit type conversions, I don't believe this was a home-grown DSL.

Answer 1

等待大神答复