static void Main(string[] args)
{
var freesql = new FreeSql.FreeSqlBuilder()
.UseConnectionString(FreeSql.DataType.PostgreSQL, "")
.Build();
TableInfomationInitor.Initialize(freesql, typeof(Test), typeof(DomainFlags));
OrmNavigate <Test> .Join <Test2>(item => item.DomainFlags, item => item.Id);
var sql = new JoinTemplate <Test>(freesql);
var result = sql.ToList(item => new
{
item.Id,
item.DomainFlags,
DomainName = RightJoin <DomainFlags> .MapFrom(item => item.Name)
});
sql = new JoinTemplate <Test>(freesql);
var result1 = sql.ToList(item => new
{
item.Id,
item.DomainFlags,
DomainName = InnerJoin <DomainFlags> .MapFrom(item => item.Name)
});
Console.ReadKey();
}
/// <summary>
/// Adds a right join to the query.
/// </summary>
/// <param name="alias">The alias with tablename/alias name.</param>
/// <param name="onCriteria">The ON criteria.</param>
/// <returns></returns>
/// <exception cref="ArgumentNullException">
/// alias is null
/// or
/// alias.table is null
/// </exception>
public SqlQuery RightJoin(IAlias alias, ICriteria onCriteria)
{
if (alias == null)
{
throw new ArgumentNullException("alias");
}
if (string.IsNullOrEmpty(alias.Table))
{
throw new ArgumentNullException("alias.table");
}
var join = new RightJoin(alias.Table, alias.Name, onCriteria);
Join(join);
if (alias as IHaveJoins != null)
{
AliasWithJoins[alias.Name] = alias as IHaveJoins;
}
return(this);
}
public IEnumerable <object> ToList <TReturn>(Expression <Func <TEntity, TReturn> > expression)
{
var code = expression.GetHashCode();
if (SelectHandler == null)
{
SelectHandler = SqlHandler.Select <TEntity>();
}
var type = typeof(TReturn);
if (!JoinExpressionMapping.Contains(code))
{
var nclass = NClass.DefaultDomain().Public();
StringBuilder script = new StringBuilder();
// 获取构造函数参数
var arguments = ((NewExpression)expression.Body).Arguments;
//获取匿名类成员
var members = ((NewExpression)expression.Body).Members;
var joinTypeFlagMapping = new Dictionary <Type, JoinTypeFlag>();
for (int i = 0; i < arguments.Count; i++)
{
// 方法类型参数
if (arguments[i].NodeType == ExpressionType.Call)
{
var methodExpression = (MethodCallExpression)arguments[i];
var methodDeclaringType = methodExpression.Method.DeclaringType;
if (methodDeclaringType.IsGenericType && methodDeclaringType.GetGenericTypeDefinition().Name.Contains("Join"))
{
var joinType = methodDeclaringType.GetGenericArguments()[0];
if (methodExpression.Arguments[0].NodeType == ExpressionType.Quote)
{
var quoteExpression = (UnaryExpression)methodExpression.Arguments[0];
if (quoteExpression.Operand.NodeType == ExpressionType.Lambda)
{
var lambdaExpression = (LambdaExpression)quoteExpression.Operand;
if (lambdaExpression.Body.NodeType == ExpressionType.MemberAccess)
{
var memberExpression = (MemberExpression)lambdaExpression.Body;
nclass.Property(item => item
.Public()
.Type(((PropertyInfo)memberExpression.Member).PropertyType)
.Name(memberExpression.Member.Name));
var definitionType = methodDeclaringType.GetGenericTypeDefinition();
if (definitionType == typeof(InnerJoin <>))
{
joinTypeFlagMapping[joinType] = JoinTypeFlag.Inner;
script.Append(InnerJoin.GetJoinScript(joinType));
}
else if (definitionType == typeof(LeftJoin <>))
{
joinTypeFlagMapping[joinType] = JoinTypeFlag.Left;
script.Append(LeftJoin.GetJoinScript(joinType));
}
else if (definitionType == typeof(RightJoin <>))
{
joinTypeFlagMapping[joinType] = JoinTypeFlag.Right;
script.Append(RightJoin.GetJoinScript(joinType));
}
script.Append($".\"{memberExpression.Member.Name}\" AS \"{members[i].Name}\",");
}
}
}
}
}
else if (arguments[i].NodeType == ExpressionType.MemberAccess)
{
var memberExpression = (MemberExpression)arguments[i];
nclass.Property(item => item
.Public()
.Type(((PropertyInfo)memberExpression.Member).PropertyType)
.Name(memberExpression.Member.Name));
script.Append($"a.\"{memberExpression.Member.Name}\",");
}
//JoinObjectCache<ISelect<T>, TReturn>.GetObjects = NDelegate.RandomDomain().Func<ISelect<T>, object>(builder.ToString());
}
if (script.Length > 1)
{
script.Length -= 1;
var joinScript = script.ToString();
JoinExpressionMapping = JoinExpressionMapping.Add(code);
var tempClass = nclass.GetType();
ProxyCaller <TEntity, TReturn> .Add(code, NDelegate
.DefaultDomain(item => item.LogSyntaxError())
.Func <ISelect <TEntity>, IEnumerable <object> >($"return arg.ToList<{tempClass.GetDevelopName()}>(\"{joinScript.Replace("\"","\\\"")}\");"));
var builder = new StringBuilder();
foreach (var item in joinTypeFlagMapping)
{
var joinFieldCache = OrmNavigate <TEntity> .JoinScriptMapping[item.Key];
string joinAlias = string.Empty;
switch (item.Value)
{
case JoinTypeFlag.Left:
joinAlias = LeftJoin.GetJoinScript(item.Key);
builder.Append($"obj.LeftJoin(\"");
break;
case JoinTypeFlag.Inner:
joinAlias = InnerJoin.GetJoinScript(item.Key);
builder.Append($"obj.InnerJoin(\"");
break;
case JoinTypeFlag.Right:
joinAlias = RightJoin.GetJoinScript(item.Key);
builder.Append($"obj.RightJoin(\"");
break;
default:
break;
}
var joinFieldScript = $"\"{item.Key.Name}\" AS {joinAlias} ON a.\"{joinFieldCache.src}\" = {joinAlias}.\"{joinFieldCache.dst}\"";
builder.Append(joinFieldScript.Replace("\"", "\\\""));
builder.AppendLine("\");");
}
//$"\"{typeof(TJoinEntity).Name}\" AS {InnerJoinHelper<TJoinEntity>.JoinAliasName} ON a.\"{srcFieldName}\" = {InnerJoinHelper<TJoinEntity>.JoinAliasName}.\"{destFieldName}\"")
JoinFiller <TEntity, TReturn> .Add(code, NDelegate
.DefaultDomain()
.Action <ISelect <TEntity> >(builder.ToString()));
}
}
JoinFiller <TEntity, TReturn> .HandlerSelect(code, SelectHandler);
return(ProxyCaller <TEntity, TReturn> .ToList(code, SelectHandler));
}
protected override void SetupJoinConditions()
{
RightJoin.Left(_keys).Right(_keys);
}
