defmodule Jamdb.Sybase.Query do
@moduledoc """
Adapter module for Sybase. `DBConnection.Query` protocol implementation.
See `DBConnection.prepare_execute/4`.
"""
defstruct [:statement, :name]
@parent_as __MODULE__
alias Ecto.Query.{BooleanExpr, JoinExpr, QueryExpr}
@doc false
def all(query, as_prefix \\ []) do
sources = create_names(query, as_prefix)
from = from(query, sources)
select = select(query, sources)
join = join(query, sources)
where = where(query, sources)
group_by = group_by(query, sources)
having = having(query, sources)
combinations = combinations(query)
order_by = order_by(query, sources)
lock = lock(query.lock)
[select, from, join, where, group_by, having, combinations, order_by | lock]
end
@doc false
def update_all(%{from: %{source: source}} = query, prefix \\ nil) do
sources = create_names(query, [])
{from, name} = get_source(query, sources, 0, source)
prefix = prefix || ["UPDATE ", from | " SET "]
fields = update_fields(query, sources)
where = where(%{query | wheres: query.wheres}, sources)
[prefix, fields, " FROM ", from, ?\s, name, where]
end
@doc false
def delete_all(%{from: from} = query) do
sources = create_names(query, [])
{from, name} = get_source(query, sources, 0, from)
where = where(%{query | wheres: query.wheres}, sources)
["DELETE ", from, " FROM ", from, ?\s, name, where]
end
@doc false
def insert(prefix, table, header, rows, _on_conflict, _returning, placeholders \\ []) do
counter_offset = length(placeholders) + 1
values =
if header == [] do
[?\s | insert_all(rows, counter_offset)]
else
[?\s, ?(, intersperse_map(header, ?,, "e_name/1), ?),
?\s | insert_all(rows, counter_offset)]
end
["INSERT INTO ", quote_table(prefix, table), values]
end
defp insert_all(query = %Ecto.Query{}, _counter) do
[?(, all(query), ?)]
end
defp insert_all(rows, counter) do
["VALUES ", intersperse_reduce(rows, ?,, counter, fn row, counter ->
{row, counter} = insert_each(row, counter)
{[?(, row, ?)], counter}
end)
|> elem(0)]
end
defp insert_each(values, counter) do
intersperse_reduce(values, ?,, counter, fn
nil, counter ->
{"DEFAULT", counter}
{%Ecto.Query{} = query, params_counter}, counter ->
{[?(, all(query), ?)], counter + params_counter}
{:placeholder, _}, counter ->
{'?', counter}
_, counter ->
{'?', counter + 1}
end)
end
@doc false
def update(prefix, table, fields, filters, _returning) do
{fields, count} = intersperse_reduce(fields, ", ", 1, fn field, acc ->
{[quote_name(field), " = ?"], acc + 1}
end)
{filters, _count} = intersperse_reduce(filters, " AND ", count, fn
{field, nil}, acc ->
{[quote_name(field), " IS NULL"], acc}
{field, _value}, acc ->
{[quote_name(field), " = ?"], acc + 1}
end)
["UPDATE ", quote_table(prefix, table), " SET ",
fields, " WHERE ", filters]
end
@doc false
def delete(prefix, table, filters, _returning) do
{filters, _} = intersperse_reduce(filters, " AND ", 1, fn
{field, nil}, acc ->
{[quote_name(field), " IS NULL"], acc}
{field, _value}, acc ->
{[quote_name(field), " = ?"], acc + 1}
end)
["DELETE FROM ", quote_table(prefix, table), " WHERE ", filters]
end
@doc false
def table_exists_query(table) do
{"SELECT count(*) FROM sysobjects WHERE name = ? AND type='U'", [table]}
end
@doc false
def execute_ddl(_command),
do: error!(nil, "execute ddl is not supported")
@doc false
def ddl_logs(_result), do: []
@doc false
def to_constraints(_err, _opts \\ []), do: []
## Query generation
binary_ops =
[==: " = ", !=: " != ", <=: " <= ", >=: " >= ", <: " < ", >: " > ",
+: " + ", -: " - ", *: " * ", /: " / ",
and: " AND ", or: " OR ", like: " LIKE "]
@binary_ops Keyword.keys(binary_ops)
Enum.map(binary_ops, fn {op, str} ->
defp handle_call(unquote(op), 2), do: {:binary_op, unquote(str)}
end)
defp handle_call(fun, _arity), do: {:fun, Atom.to_string(fun)}
defp select(%{select: %{fields: fields}, distinct: distinct} = query, sources) do
["SELECT ", limit(query, sources), distinct(distinct, sources, query) |
select_fields(fields, sources, query)]
end
defp select_fields([], _sources, _query),
do: "1"
defp select_fields(fields, sources, query) do
intersperse_map(fields, ", ", fn
{:&, _, [idx]} ->
case elem(sources, idx) do
{_, source, nil} -> [source, ?. | "*"]
{_, source, _} -> source
end
{key, value} ->
[expr(value, sources, query), ?\s | quote_name(key)]
value ->
expr(value, sources, query)
end)
end
defp distinct(nil, _, _), do: []
defp distinct(%QueryExpr{expr: []}, _, _), do: {[], []}
defp distinct(%QueryExpr{expr: true}, _, _), do: "DISTINCT "
defp distinct(%QueryExpr{expr: false}, _, _), do: []
defp distinct(%QueryExpr{expr: exprs}, _, _) when is_list(exprs), do: "DISTINCT "
defp from(%{from: %{hints: [_ | _]}} = query, _sources) do
error!(query, "table hints are not supported")
end
defp from(%{from: %{source: source}} = query, sources) do
{from, name} = get_source(query, sources, 0, source)
[" FROM ", from, ?\s | name]
end
defp update_fields(%{updates: updates} = query, sources) do
for(%{expr: expr} <- updates,
{op, kw} <- expr,
{key, value} <- kw,
do: update_op(op, key, value, sources, query)) |> Enum.intersperse(", ")
end
defp update_op(:set, key, value, sources, query) do
[quote_name(key), " = " | expr(value, sources, query)]
end
defp update_op(:inc, key, value, sources, query) do
[quote_name(key), " = ", quote_qualified_name(key, sources, 0), " + " |
expr(value, sources, query)]
end
defp update_op(command, _quoted_key, _value, _sources, query) do
error!(query, "Unknown update operation #{inspect command}")
end
defp join(%{joins: []}, _sources), do: []
defp join(%{joins: joins} = query, sources) do
[?\s | intersperse_map(joins, ?\s, fn
%JoinExpr{on: %QueryExpr{expr: expr}, qual: qual, ix: ix, source: source, hints: hints} ->
if hints != [] do
error!(query, "table hints are not supported")
end
{join, name} = get_source(query, sources, ix, source)
[join_qual(qual), join, ?\s, name | join_on(qual, expr, sources, query)]
end)]
end
defp join_on(:cross, true, _sources, _query), do: []
defp join_on(_qual, true, _sources, _query), do: [" ON 1 = 1"]
defp join_on(_qual, expr, sources, query), do: [" ON " | expr(expr, sources, query)]
defp join_qual(:inner), do: "INNER JOIN "
defp join_qual(:left), do: "LEFT OUTER JOIN "
defp join_qual(:right), do: "RIGHT OUTER JOIN "
defp where(%{wheres: wheres} = query, sources) do
boolean(" WHERE ", wheres, sources, query)
end
defp having(%{havings: havings} = query, sources) do
boolean(" HAVING ", havings, sources, query)
end
defp group_by(%{group_bys: []}, _sources), do: []
defp group_by(%{group_bys: group_bys} = query, sources) do
[" GROUP BY " |
intersperse_map(group_bys, ", ", fn
%QueryExpr{expr: expr} ->
intersperse_map(expr, ", ", &expr(&1, sources, query))
end)]
end
defp order_by(%{order_bys: []}, _sources), do: []
defp order_by(%{order_bys: order_bys} = query, sources) do
[" ORDER BY " |
intersperse_map(order_bys, ", ", fn
%QueryExpr{expr: expr} ->
intersperse_map(expr, ", ", &order_by_expr(&1, sources, query))
end)]
end
defp order_by_expr({dir, expr}, sources, query) do
str = expr(expr, sources, query)
case dir do
:asc -> str
:desc -> [str | " DESC"]
end
end
defp limit(%{limit: nil}, _sources), do: []
defp limit(%{limit: %{expr: expr}} = query, sources) do
[" TOP ", expr(expr, sources, query), ?\s]
end
defp combinations(%{combinations: combinations}) do
Enum.map(combinations, fn
{:union, query} -> [" UNION (", all(query), ")"]
{:union_all, query} -> [" UNION ALL (", all(query), ")"]
end)
end
defp lock(nil), do: []
defp lock(lock_clause), do: [?\s | lock_clause]
defp boolean(_name, [], _sources, _query), do: []
defp boolean(name, [%{expr: expr, op: op} | query_exprs], sources, query) do
[name |
Enum.reduce(query_exprs, {op, paren_expr(expr, sources, query)}, fn
%BooleanExpr{expr: expr, op: op}, {op, acc} ->
{op, [acc, operator_to_boolean(op), paren_expr(expr, sources, query)]}
%BooleanExpr{expr: expr, op: op}, {_, acc} ->
{op, [?(, acc, ?), operator_to_boolean(op), paren_expr(expr, sources, query)]}
end) |> elem(1)]
end
defp operator_to_boolean(:and), do: " AND "
defp operator_to_boolean(:or), do: " OR "
defp parens_for_select([first_expr | _] = expr) do
if is_binary(first_expr) and String.starts_with?(first_expr, ["SELECT", "select"]) do
[?(, expr, ?)]
else
expr
end
end
defp paren_expr(expr, sources, query) do
[?(, expr(expr, sources, query), ?)]
end
defp expr({:^, [], [_ix]}, _sources, _query) do
'?'
end
defp expr({{:., _, [{:parent_as, _, [as]}, field]}, _, []}, _sources, query)
when is_atom(field) do
{ix, sources} = get_parent_sources_ix(query, as)
quote_qualified_name(field, sources, ix)
end
defp expr({{:., _, [{:&, _, [idx]}, field]}, _, []}, sources, _query) when is_atom(field) do
quote_qualified_name(field, sources, idx)
end
defp expr({:&, _, [idx]}, sources, _query) do
{_, source, _} = elem(sources, idx)
source
end
defp expr({:in, _, [_left, []]}, _sources, _query) do
"0"
end
defp expr({:in, _, [left, right]}, sources, query) when is_list(right) do
args = intersperse_map(right, ?,, &expr(&1, sources, query))
[expr(left, sources, query), " IN (", args, ?)]
end
defp expr({:in, _, [_, {:^, _, [_, 0]}]}, _sources, _query) do
"0"
end
defp expr({:in, _, [left, {:^, _, [_, length]}]}, sources, query) do
args = Enum.intersperse(List.duplicate(??, length), ?,)
[expr(left, sources, query), " IN (", args, ?)]
end
defp expr({:in, _, [left, %Ecto.SubQuery{} = subquery]}, sources, query) do
[expr(left, sources, query), " IN ", expr(subquery, sources, query)]
end
defp expr({:in, _, [left, right]}, sources, query) do
[expr(left, sources, query), " = ANY(", expr(right, sources, query), ?)]
end
defp expr({:is_nil, _, [arg]}, sources, query) do
[expr(arg, sources, query) | " IS NULL"]
end
defp expr({:not, _, [expr]}, sources, query) do
["NOT (", expr(expr, sources, query), ?)]
end
defp expr(%Ecto.SubQuery{query: query}, sources, parent_query) do
query = put_in(query.aliases[@parent_as], {parent_query, sources})
[?(, all(query, subquery_as_prefix(sources)), ?)]
end
defp expr({:fragment, _, [kw]}, _sources, query) when is_list(kw) or tuple_size(kw) == 3 do
error!(query, "keyword or interpolated fragments are not supported")
end
defp expr({:fragment, _, parts}, sources, query) do
Enum.map(parts, fn
{:raw, part} -> part
{:expr, expr} -> expr(expr, sources, query)
end)
|> parens_for_select
end
defp expr({:date_add, _, [date, count, interval]}, sources, query) do
interval(date, count, interval, sources, query)
end
defp expr({:datetime_add, _, [datetime, count, interval]}, sources, query) do
interval(datetime, count, interval, sources, query)
end
defp expr({:from_now, _, [count, interval]}, sources, query) do
interval(DateTime.utc_now, count, interval, sources, query)
end
defp expr({:ago, _, [count, interval]}, sources, query) do
interval(DateTime.utc_now, count, interval, sources, query)
end
defp expr({:filter, _, _}, _sources, query) do
error!(query, "aggregate filters are not supported")
end
defp expr({:{}, _, elems}, sources, query) do
[?(, intersperse_map(elems, ?,, &expr(&1, sources, query)), ?)]
end
defp expr({:count, _, []}, _sources, _query), do: "count(*)"
defp expr({:count, _, [literal, :distinct]}, sources, query) do
exprs = expr(literal, sources, query)
["count (", distinct(%QueryExpr{expr: exprs}, sources, query), exprs, ?)]
end
defp expr({fun, _, args}, sources, query) when is_atom(fun) and is_list(args) do
{modifier, args} =
case args do
[rest, :distinct] -> {"DISTINCT ", [rest]}
_ -> {[], args}
end
case handle_call(fun, length(args)) do
{:binary_op, op} ->
[left, right] = args
[maybe_paren(left, sources, query), op | maybe_paren(right, sources, query)]
{:fun, fun} ->
[fun, ?(, modifier, intersperse_map(args, ", ", &expr(&1, sources, query)), ?)]
end
end
defp expr(%Ecto.Query.Tagged{value: literal}, sources, query) do
["CAST(", expr(literal, sources, query), " AS varchar)"]
end
defp expr(nil, _sources, _query), do: "NULL"
defp expr(true, _sources, _query), do: "1"
defp expr(false, _sources, _query), do: "0"
defp expr(literal, _sources, _query) when is_binary(literal) do
["'", escape_string(literal), "'"]
end
defp expr(literal, _sources, _query) when is_integer(literal) do
Integer.to_string(literal)
end
defp expr(literal, _sources, _query) when is_float(literal) do
Float.to_string(literal)
end
defp interval(datetime, count, interval, sources, query) do
["dateadd (", interval, ?,, expr(count, sources, query), ?,,
expr(datetime, sources, query), ?)]
end
defp maybe_paren({op, _, [_, _]} = expr, sources, query) when op in @binary_ops,
do: paren_expr(expr, sources, query)
defp maybe_paren({:is_nil, _, [_]} = expr, sources, query),
do: paren_expr(expr, sources, query)
defp maybe_paren(expr, sources, query),
do: expr(expr, sources, query)
defp create_names(%{sources: sources}, as_prefix) do
create_names(sources, 0, tuple_size(sources), as_prefix) |> List.to_tuple()
end
defp create_names(sources, pos, limit, as_prefix) when pos < limit do
[create_name(sources, pos, as_prefix) | create_names(sources, pos + 1, limit, as_prefix)]
end
defp create_names(_sources, pos, pos, as_prefix) do
[as_prefix]
end
defp subquery_as_prefix(sources) do
[?s | :erlang.element(tuple_size(sources), sources)]
end
defp create_name(sources, pos, as_prefix) do
case elem(sources, pos) do
{:fragment, _, _} ->
{nil, as_prefix ++ [?f | Integer.to_string(pos)], nil}
{table, schema, prefix} ->
name = as_prefix ++ [create_alias(table) | Integer.to_string(pos)]
{quote_table(prefix, table), name, schema}
%Ecto.SubQuery{} ->
{nil, as_prefix ++ [?s | Integer.to_string(pos)], nil}
end
end
defp create_alias(<<first, _rest::binary>>) when first in ?a..?z when first in ?A..?Z do
<<first>>
end
defp create_alias(_) do
"t"
end
## Helpers
defp get_source(query, sources, ix, source) do
{expr, name, _schema} = elem(sources, ix)
{expr || paren_expr(source, sources, query), name}
end
defp get_parent_sources_ix(query, as) do
case query.aliases[@parent_as] do
{%{aliases: %{^as => ix}}, sources} -> {ix, sources}
{%{} = parent, _sources} -> get_parent_sources_ix(parent, as)
end
end
defp quote_qualified_name(name, sources, ix) do
{_, source, _} = elem(sources, ix)
[source, ?. | quote_name(name)]
end
defp quote_name(name) when is_atom(name) do
quote_name(Atom.to_string(name))
end
defp quote_name(name) do
[name]
end
defp quote_table(nil, name), do: quote_table(name)
defp quote_table(prefix, name), do: [quote_table(prefix), ?., quote_table(name)]
defp quote_table(name) when is_atom(name),
do: quote_table(Atom.to_string(name))
defp quote_table(name) do
[name]
end
defp intersperse_map(list, separator, mapper, acc \\ [])
defp intersperse_map([], _separator, _mapper, acc),
do: acc
defp intersperse_map([elem], _separator, mapper, acc),
do: [acc | mapper.(elem)]
defp intersperse_map([elem | rest], separator, mapper, acc),
do: intersperse_map(rest, separator, mapper, [acc, mapper.(elem), separator])
defp intersperse_reduce(list, separator, user_acc, reducer, acc \\ [])
defp intersperse_reduce([], _separator, user_acc, _reducer, acc),
do: {acc, user_acc}
defp intersperse_reduce([elem], _separator, user_acc, reducer, acc) do
{elem, user_acc} = reducer.(elem, user_acc)
{[acc | elem], user_acc}
end
defp intersperse_reduce([elem | rest], separator, user_acc, reducer, acc) do
{elem, user_acc} = reducer.(elem, user_acc)
intersperse_reduce(rest, separator, user_acc, reducer, [acc, elem, separator])
end
defp escape_string(value) when is_list(value) do
escape_string(:binary.list_to_bin(value))
end
defp escape_string(value) when is_binary(value) do
:binary.replace(value, "'", "''", [:global])
end
defp error!(nil, msg) do
raise ArgumentError, msg
end
defp error!(query, msg) do
raise Ecto.QueryError, query: query, message: msg
end
end
defimpl String.Chars, for: Jamdb.Sybase.Query do
def to_string(%Jamdb.Sybase.Query{statement: statement}) do
IO.iodata_to_binary(statement)
end
end
