shard-crystal-sqlite3/samples/memory.cr

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require "db"
require "../src/sqlite3"
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DB.open "sqlite3://%3Amemory%3A" do |db|
db.exec "create table contacts (name text, age integer)"
db.exec "insert into contacts values (?, ?)", "John Doe", 30
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args = [] of DB::Any
args << "Sarah"
args << 33
db.exec "insert into contacts values (?, ?)", args: args
puts "max age:"
puts db.scalar "select max(age) from contacts" # => 33
puts "contacts:"
db.query "select name, age from contacts order by age desc" do |rs|
puts "#{rs.column_name(0)} (#{rs.column_name(1)})"
# => name (age)
rs.each do
puts "#{rs.read(String)} (#{rs.read(Int32)})"
# => Sarah (33)
# => John Doe (30)
end
end
end