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增加 int.Parse Guid.Parse 系列转换、Guid.NewGuid、new Random.NextDouble 等表达式函数解析

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This commit is contained in:
28810
2019-03-18 12:16:09 +08:00
parent e23ae9d7ac
commit 8372f96ab1
13 changed files with 537 additions and 70 deletions
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59
FreeSql/Sqlite/SqliteExpression.cs
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@ -15,8 +15,67 @@ namespace FreeSql.Sqlite {
internal override string ExpressionLambdaToSqlOther(Expression exp, List<SelectTableInfo> _tables, List<SelectColumnInfo> _selectColumnMap, Func<Expression[], string> getSelectGroupingMapString, SelectTableInfoType tbtype, bool isQuoteName) {
Func<Expression, string> getExp = exparg => ExpressionLambdaToSql(exparg, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
switch (exp.NodeType) {
case ExpressionType.Convert:
var operandExp = (exp as UnaryExpression)?.Operand;
switch (exp.Type.NullableTypeOrThis().ToString()) {
case "System.Boolean": return $"({getExp(operandExp)} not in ('0','false'))";
case "System.Byte": return $"cast({getExp(operandExp)} as int2)";
case "System.Char": return $"substr(cast({getExp(operandExp)} as character), 1, 1)";
case "System.DateTime": return $"datetime({getExp(operandExp)})";
case "System.Decimal": return $"cast({getExp(operandExp)} as decimal(36,18))";
case "System.Double": return $"cast({getExp(operandExp)} as double)";
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.SByte": return $"cast({getExp(operandExp)} as smallint)";
case "System.Single": return $"cast({getExp(operandExp)} as float)";
case "System.String": return $"cast({getExp(operandExp)} as character)";
case "System.UInt16": return $"cast({getExp(operandExp)} as unsigned)";
case "System.UInt32": return $"cast({getExp(operandExp)} as decimal(10,0))";
case "System.UInt64": return $"cast({getExp(operandExp)} as decimal(21,0))";
case "System.Guid": return $"substr(cast({getExp(operandExp)} as character), 1, 36)";
}
break;
case ExpressionType.Call:
var callExp = exp as MethodCallExpression;
switch (callExp.Method.Name) {
case "Parse":
case "TryParse":
switch (callExp.Method.DeclaringType.NullableTypeOrThis().ToString()) {
case "System.Boolean": return $"({getExp(callExp.Arguments[0])} not in ('0','false'))";
case "System.Byte": return $"cast({getExp(callExp.Arguments[0])} as int2)";
case "System.Char": return $"substr(cast({getExp(callExp.Arguments[0])} as character), 1, 1)";
case "System.DateTime": return $"datetime({getExp(callExp.Arguments[0])})";
case "System.Decimal": return $"cast({getExp(callExp.Arguments[0])} as decimal(36,18))";
case "System.Double": return $"cast({getExp(callExp.Arguments[0])} as double)";
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.SByte": return $"cast({getExp(callExp.Arguments[0])} as smallint)";
case "System.Single": return $"cast({getExp(callExp.Arguments[0])} as float)";
case "System.UInt16": return $"cast({getExp(callExp.Arguments[0])} as unsigned)";
case "System.UInt32": return $"cast({getExp(callExp.Arguments[0])} as decimal(10,0))";
case "System.UInt64": return $"cast({getExp(callExp.Arguments[0])} as decimal(21,0))";
case "System.Guid": return $"substr(cast({getExp(callExp.Arguments[0])} as character), 1, 36)";
}
break;
case "NewGuid":
break;
case "Next":
if (callExp.Object?.Type == typeof(Random)) return "cast(random()*1000000000 as int)";
break;
case "NextDouble":
if (callExp.Object?.Type == typeof(Random)) return "random()";
break;
case "Random":
if (callExp.Method.DeclaringType.IsNumberType()) return "random()";
break;
case "ToString":
if (callExp.Object != null) return $"cast({getExp(callExp.Object)} as character)";
break;
}
var objExp = callExp.Object;
var objType = objExp?.Type;
if (objType?.FullName == "System.Byte[]") return null;