/// <summary>
///
/// </summary>
static string OnConflictDoUpdate(OnConflictDoUpdateClause doUpdate, ParamMode paramMode, SqlParamDic paramDic, string origTableName)
{
var b = new StringBuilder();
b.AppendLine("DO UPDATE");
b.AppendLine("SET");
var exprAlias = new[]
{
new SqlFromList.ExprStrRawSql(doUpdate.Set.Parameters[0], "EXCLUDED"),
new SqlFromList.ExprStrRawSql(doUpdate.Set.Parameters[1], $"\"{origTableName}\""),
};
var setSql = SqlUpdate.SetToSql(doUpdate.Set.Body, paramMode, paramDic, exprAlias);
b.Append(SqlSelect.TabStr(setSql));
if (doUpdate.Where != null)
{
b.AppendLine();
var pars = new SqlExprParams(null, null, false, "", new SqlFromList.ExprStrRawSql[0], paramMode, paramDic);
var whereSql = SqlExpression.ExprToSql(doUpdate.Where.Body, pars, true);
b.Append(whereSql);
}
return(b.ToString());
}
static void ConvertWhere(StringBuilder b, DeleteClause clause, ParamMode paramMode, SqlParamDic paramDic)
{
var whereParms = clause.Where.Parameters;
var tableParam = whereParms[0];
var usingParam = whereParms[1];
var replace = new SqlFromList.ExprStrRawSql[0];
var pars = new SqlExprParams(tableParam, null, false, null, replace, paramMode, paramDic);
var whereSql = SqlExpression.ExprToSql(clause.Where.Body, pars, true);
b.Append("WHERE ");
b.Append(whereSql);
}
/// <summary>
/// Convierte la cláusura ON CONFLICT
/// </summary>
static string OnConflict(OnConflictClause onConf, ParamMode paramMode, SqlParamDic paramDic, string tableName)
{
var b = new StringBuilder();
//fromAlias es null ya que en la expresion de indice de ON CONFLICT no se permiten
//los identificadores de las tablas, sólo se permiten los nombres tal cual de las columnas
var pars = new SqlExprParams(null, null, false, null, new SqlFromList.ExprStrRawSql[0], paramMode, paramDic);
var indexExpr = onConf
.IndexExpressions
.Select(x => SqlExpression.ExprToSql(x.Body, pars.ReplaceSelectParams(x.Parameters[0], null), true))
;
b.Append("ON CONFLICT ");
if (indexExpr.Any())
{
b.Append("(");
b.Append(string.Join(", ", indexExpr));
b.Append(") ");
}
if (onConf.Where != null)
{
var whereSql = SqlExpression.ExprToSql(onConf.Where.Body, pars.ReplaceSelectParams(onConf.Where.Parameters[0], null), true);
b.Append("WHERE ");
b.Append(whereSql);
}
if (onConf.DoUpdate == null)
{
//Si DoUpdate es null se considera que es DO NOTHING
b.Append("DO NOTHING");
}
else
{
b.Append(OnConflictDoUpdate(onConf.DoUpdate, paramMode, paramDic, tableName));
}
return(b.ToString());
}
/// <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 });
}
