/// <summary>
/// Convierte la cláusula RETURNING a SQL
/// </summary>
static (string sql, IReadOnlyList <string> cols) ReturningToString(LambdaExpression returning, ParamMode paramMode, SqlParamDic paramDic, string tableName)
{
var pars = new SqlExprParams(returning.Parameters[0], null, false, tableName, new SqlFromList.ExprStrRawSql[0], paramMode, paramDic);
var select = SqlSelect.SelectBodyToStr(returning.Body, pars);
var sql = $"RETURNING {Environment.NewLine}{SqlSelect.TabStr(SqlSelect.SelectExprToStr(select.Values))}";
var cols = select.Values.Select(x => x.Column).ToList();
return(sql, cols);
}
/// <summary>
/// La regla que se aplica a las llamadas Atom(Raw(x)), lo que hace es convertir las llamadas ToSql del Atom(Raw(x))
/// </summary>
public static IEnumerable <RewriteRule> AtomRawRule(SqlExprParams pars)
{
var deferredToSqlRule = RewriteRule.Create(
"deferredToSql",
(RewriteTypes.C1 x) => SqlFunctions.ToSql <RewriteTypes.C1>(x),
null,
null,
(match, expr, visit) => Expression.Call(
typeof(SqlExpression),
nameof(SqlExpression.ExprToSql),
new Type[0],
Expression.Constant(match.Args[0]),
Expression.Constant(pars),
Expression.Constant(true)));
var toSqlRule = RewriteRule.Create(
"toSql",
() => RewriteSpecial.Call <string>(typeof(SqlFunctions), nameof(ToSql)),
null,
null,
(match, expr, visit) => Expression.Constant(SqlExpression.ExprToSql(((MethodCallExpression)expr).Arguments[0], pars, true)));
var toSelectBodySqlRule = RewriteRule.Create(
"toSelectBodySqlRule",
() => RewriteSpecial.Call <string>(typeof(SqlFunctions), nameof(ToSelectBodySql)),
null,
null,
(match, expr, visit) =>
Expression.Constant(
SqlSelect.SelectExprToStr(SqlSelect.SelectBodyToStr(((MethodCallExpression)expr).Arguments[0], pars).Values)
)
);
var windowToSqlRule = RewriteRule.Create(
"windowToSql",
(ISqlWindow a) => WindowToSql(a),
null,
null,
(match, expr, visit) => Expression.Constant(SqlCalls.WindowToSql(match.Args[0]))
);
var toSqlRules = new[]
{
toSelectBodySqlRule,
toSqlRule,
windowToSqlRule
};
Func <Expression, Expression> applySqlRule = (Expression ex) => new RewriteVisitor(toSqlRules, ExcludeFromRewrite).Visit(ex);
var atomRawRule = RewriteRule.Create(
"executeAtomRaw",
(string x) => RewriteSpecial.Atom(Sql.Raw <RewriteTypes.C1>(RewriteSpecial.NotConstant(x))),
null,
null,
(match, expr, visit) =>
{
var arg = match.Args[0];
var applySql = applySqlRule(arg);
if (applySql == arg)
{
return(expr);
}
var type = match.Types[typeof(RewriteTypes.C1)];
var value = ExprEval.EvalExpr <string>(applySql).Value;
var ret = Expression.Call(typeof(RewriteSpecial), nameof(RewriteSpecial.Atom), new[] { type },
Expression.Call(typeof(Sql), nameof(Sql.Raw), new[] { type }, Expression.Constant(value))
);
return(ret);
});
return(new[] { atomRawRule });
}
