protected override SqlGenerate Where(MemberExpression expression, SqlGenerate sqlGenerate)
{
if (expression.Expression != null)
{
if (expression.Member.DeclaringType.IsNullableType())
{
if (expression.Member.Name == "Value") //Can't use C# 6 yet: nameof(Nullable<bool>.Value)
{
SqlExpressionProvider.Where(expression.Expression, sqlGenerate);
return(sqlGenerate);
}
if (expression.Member.Name == "HasValue")
{
var doesNotEqualNull = Expression.MakeBinary(ExpressionType.NotEqual, expression.Expression, Expression.Constant(null));
SqlExpressionProvider.Where(doesNotEqualNull, sqlGenerate);
return(sqlGenerate);
}
throw new ArgumentException($"Expression '{expression}' accesses unsupported property '{expression.Member}' of Nullable<T>");
}
if (expression.IsParameterOrConvertAccess())
{
sqlGenerate += $" {expression.Member.Name.ParamSql(sqlGenerate)}";
return(sqlGenerate);
}
}
var val = SqlExpressionCompiler.Evaluate(expression);
sqlGenerate.AddDbParameter(val);
return(sqlGenerate);
}
protected override SqlGenerate In(MemberExpression expression, SqlGenerate sqlGenerate)
{
var result = SqlExpressionCompiler.Evaluate(expression);
var inArgs = (result as IEnumerable).Flatten();
sqlGenerate.AddDbParameter(inArgs);
return(sqlGenerate);
}
protected override SqlGenerate Update(MemberExpression expression, SqlGenerate sqlGenerate)
{
var obj = SqlExpressionCompiler.Evaluate(expression);
if (obj == null)
{
throw new ArgumentException($"Expression '{expression}' accesses unsupported property '{expression.Member}' of Nullable<T>");
}
if (obj.GetType().IsValueType)
{
throw new ArgumentException($"Expression '{expression}' accesses unsupported valuetype");
}
if (obj.GetType() == typeof(string))
{
sqlGenerate += obj.ToString();
}
else if (obj is IDictionary dictionary)
{
foreach (string key in dictionary.Keys)
{
sqlGenerate += $"{key.ParamSql(sqlGenerate)} = ";
sqlGenerate.AddDbParameter(dictionary[key]);
sqlGenerate += ",";
}
}
else
{
var pis = obj.GetType().GetProperties();
foreach (var p in pis)
{
sqlGenerate += $"{p.Name.ParamSql(sqlGenerate)} = ";
sqlGenerate.AddDbParameter(p.GetValue(obj));
sqlGenerate += ",";
}
}
if (sqlGenerate[sqlGenerate.Length - 1] == ',')
{
sqlGenerate.Sql.Remove(sqlGenerate.Length - 1, 1);
}
return(sqlGenerate);
}
private static void StartsWith(MethodCallExpression expression, SqlGenerate sqlGenerate)
{
SqlExpressionProvider.Where(expression.Object, sqlGenerate);
SqlExpressionProvider.Where(expression.Arguments[0], sqlGenerate);
sqlGenerate += " like ";
var val = SqlExpressionCompiler.Evaluate(expression.Arguments[0]);
sqlGenerate.AddDbParameter($"{val}%");
}
protected override SqlGenerate In(NewArrayExpression expression, SqlGenerate sqlGenerate)
{
var list = new List <object>();
foreach (var expressionItem in expression.Expressions)
{
var obj = SqlExpressionCompiler.Evaluate(expressionItem);
list.Add(obj);
}
sqlGenerate.AddDbParameter(list);
return(sqlGenerate);
}
protected override SqlGenerate In(ListInitExpression expression, SqlGenerate sqlGenerate)
{
var list = new List <object>();
foreach (var elementInit in expression.Initializers)
{
foreach (var expre in elementInit.Arguments)
{
var obj = SqlExpressionCompiler.Evaluate(expre);
list.Add(obj);
}
}
sqlGenerate.AddDbParameter(list);
return(sqlGenerate);
}
protected override SqlGenerate Update(NewExpression expression, SqlGenerate sqlGenerate)
{
for (int i = 0; i < expression.Members.Count; i++)
{
var m = expression.Members[i];
sqlGenerate += $"{m.Name.ParamSql(sqlGenerate)} = ";
var val = SqlExpressionCompiler.Evaluate(expression.Arguments[i]);
sqlGenerate.AddDbParameter(val);
sqlGenerate += ",";
}
if (sqlGenerate[sqlGenerate.Length - 1] == ',')
{
sqlGenerate.Sql.Remove(sqlGenerate.Length - 1, 1);
}
return(sqlGenerate);
}
private static void Contains(MethodCallExpression expression, SqlGenerate sqlGenerate)
{
if (IsStaticArrayMethod(expression))
{
DoStaticArrayMethodCall(expression, sqlGenerate);
return;
}
if (IsEnumerableMethod(expression))
{
DoEnumerableMethodCall(expression, sqlGenerate);
return;
}
SqlExpressionProvider.Where(expression.Object, sqlGenerate);
sqlGenerate += " like ";
var val = SqlExpressionCompiler.Evaluate(expression.Arguments[0]);
sqlGenerate.AddDbParameter($"%{val}%");
}
protected override SqlGenerate Where(ConstantExpression expression, SqlGenerate sqlGenerate)
{
sqlGenerate.AddDbParameter(expression.Value);
return(sqlGenerate);
}