public override string Translate(LambdaExpression expr)
{
var newExpr = expr.Body as NewExpression;
if (newExpr != null)
{
foreach (var member in newExpr.Members)
{
_mapContainer.SetAlias(member.Name);
}
}
Visit(expr.Body);
//判断是否为多表操作,如果是多表操作则设置
bool multiple = expr.Parameters.Count > 0;
TranslatorDelegate.SetMultipleType();
foreach (var item in _mapContainer.MemberAliasMaps)
{
if (multiple)
{
SqlBuilder.Append($"`{TranslatorDelegate.GetTypeAlias(item.Member.DeclaringType)}`.");
}
SqlBuilder.Append($"`{TranslatorDelegate.GetMemberMap(item.Member)}] AS [{item.Alias}`,");
}
SqlBuilder.Remove(SqlBuilder.Length - 1, 1);
return(SqlBuilder.ToString());
}
public override string Translate(LambdaExpression expr)
{
var newExpr = expr.Body as NewExpression;
if (newExpr != null)
{
foreach (var member in newExpr.Members)
{
_mapContainer.SetAlias(member.Name);
}
}
Visit(expr.Body);
SqlBuilder.Append($" GROUP BY");
foreach (var item in _mapContainer.MemberAliasMaps)
{
if (TranslatorDelegate.IsMultipleType())
{
_groupByBuilder.Append($"`{TranslatorDelegate.GetTypeAlias(item.Member.DeclaringType)}`.");
}
_groupByBuilder.Append($"`{TranslatorDelegate.GetMemberMap(item.Member)}`,");
}
_groupByBuilder.Remove(SqlBuilder.Length - 1, 1);
SqlBuilder.Append(_groupByBuilder);
return(SqlBuilder.ToString());
}
protected override Expression VisitMember(MemberExpression node)
{
if (TranslatorDelegate.IsMultipleType())
{
SqlBuilder.Append($" `{TranslatorDelegate.GetTypeAlias(node.Member.DeclaringType)}`.");
}
SqlBuilder.Append($"`{TranslatorDelegate.GetMemberMap(node.Member)}`");
return(base.VisitMember(node));
}
protected override Expression VisitMember(MemberExpression node)
{
var asc = _parameter.IsAsc ? "ASC" : "DESC";
SqlBuilder.Append(TranslatorDelegate.IsFirstVisit(SectionType.OrderBy) ? $"," : $" ORDER BY");
if (TranslatorDelegate.IsMultipleType())
{
SqlBuilder.Append($" [{TranslatorDelegate.GetTypeAlias(node.Member.DeclaringType)}].");
}
SqlBuilder.Append($"[{TranslatorDelegate.GetMemberMap(node.Member)}] {asc}");
return(base.VisitMember(node));
}
protected override Expression VisitBinary(BinaryExpression node)
{
var join = " INNER JOIN";
if (_parameter.JoinType == JoinType.LeftJoin)
{
@join = " LEFT JOIN";
}
else if (_parameter.JoinType == JoinType.RightJoin)
{
@join = " RIGHT JOIN";
}
string left = "", right = "";
if (node.Left is MemberExpression)
{
var memberExprL = node.Left as MemberExpression;
var typeAlias = TranslatorDelegate.GetTypeAlias(memberExprL.Member.DeclaringType);
SqlBuilder.Append(
$" [{TranslatorDelegate.GetTableName(memberExprL.Member.DeclaringType)}] {typeAlias}");
left =
$" [{typeAlias}].[{TranslatorDelegate.GetMemberMap(memberExprL.Member)}]";
}
SqlBuilder.Append($"{join}");
if (node.Right is MemberExpression)
{
var memberExprR = node.Right as MemberExpression;
var typeAlias = TranslatorDelegate.GetTypeAlias(memberExprR.Member.DeclaringType);
SqlBuilder.Append(
$" [{TranslatorDelegate.GetTableName(memberExprR.Member.DeclaringType)}] {typeAlias}");
right = $" [{typeAlias}].[{TranslatorDelegate.GetMemberMap(memberExprR.Member)}]";
}
if (node.NodeType != ExpressionType.Equal)
{
throw new ArgumentException("Join param invalid!");
}
SqlBuilder.Append($" ON{left} ={right}");
return(node);
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (node.Method.Name == "In" || node.Method.Name == "NotIn")
{
if (node.Arguments[0] is UnaryExpression)
{
var unaryExpr = node.Arguments[0] as UnaryExpression;
var memberExpr = unaryExpr.Operand as MemberExpression;
if (memberExpr != null)
{
if (TranslatorDelegate.IsMultipleType())
{
SqlBuilder.Append($" [{TranslatorDelegate.GetTypeAlias(memberExpr.Member.DeclaringType)}].");
}
SqlBuilder.Append($"[{TranslatorDelegate.GetMemberMap(memberExpr.Member)}]");
}
}
SqlBuilder.Append($" {node.Method.Name.ToUpper()}");
if (node.Arguments[1] is NewArrayExpression)
{
var newArrayExpr = node.Arguments[1] as NewArrayExpression;
SqlBuilder.Append($" (");
foreach (var expr in newArrayExpr.Expressions)
{
SqlBuilder.Append($"{((ConstantExpression) expr).Value},");
}
SqlBuilder.Remove(SqlBuilder.Length - 1, 1);
SqlBuilder.Append($")");
}
return(node);
}
if (node.Method.Name == "Like" || node.Method.Name == "LeftLike" || node.Method.Name == "RightLike")
{
if (node.Arguments[0] is MemberExpression)
{
var memberExpr = node.Arguments[0] as MemberExpression;
if (TranslatorDelegate.IsMultipleType())
{
SqlBuilder.Append($" [{TranslatorDelegate.GetTypeAlias(memberExpr.Member.DeclaringType)}].");
}
SqlBuilder.Append($"[{TranslatorDelegate.GetMemberMap(memberExpr.Member)}]");
var paramName = GetParameterName();
SqlBuilder.Append($" LIKE {paramName}");
if (node.Arguments[1] is ConstantExpression)
{
var constantExpr = node.Arguments[1] as ConstantExpression;
switch (node.Method.Name)
{
case "Like":
_parameters.Add($"{paramName}", $"'%{constantExpr.Value}%'");
break;
case "LeftLike":
_parameters.Add($"{paramName}", $"'{constantExpr.Value}%'");
break;
case "RightLike":
_parameters.Add($"{paramName}", $"'%{constantExpr.Value}'");
break;
}
}
}
return(node);
}
return(base.VisitMethodCall(node));
}