// 添加额外列，用来判断整个（左）连接记录是否为空
private void AddSplitOnColumn(MemberExpression m, string alias)
{
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
var attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(m.Member.Name);
string keyName = attribute.OuterKeys.FirstOrDefault(a => !a.StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal));
_builder.Append("CASE WHEN ");
_builder.AppendMember(alias, keyName);
_builder.Append(" IS NULL THEN NULL ELSE ");
_builder.AppendMember(alias, keyName);
_builder.Append(" END");
// 选择字段
string newName = _selectedColumns.Add(AppConst.NAVIGATION_SPLITON_NAME);
_builder.AppendAs(newName);
_builder.Append(',');
_builder.AppendNewLine();
}
/// <summary>
/// 添加导航属性关联
/// </summary>
protected override void TanslateNavMember()
{
if (this.NavMembers == null || this.NavMembers.Count == 0)
{
return;
}
// 如果有一对多的导航属性，肯定会产生嵌套查询。那么内层查询别名肯定是t0，所以需要清掉
if (this.HasMany)
{
_aliasGenerator = new AliasGenerator(_aliasGenerator.ReserveQty);
}
//开始产生 USING 子句
ISqlBuilder jf = this.JoinFragment;
int index = -1;
// 未生成USING子句
if (_aliasGenerator.ReserveQty <= 1)
{
jf.AppendNewLine();
jf.Append(_keywordName);
}
else
{
jf.Append(',');
jf.AppendNewLine();
}
foreach (var nav in this.NavMembers)
{
index++;
string key = nav.Key;
MemberExpression m = nav.Expression;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Visitable())
{
innerKey = m.Expression.NodeType == ExpressionType.Parameter
? (m.Expression as ParameterExpression).Name
: (m.Expression as MemberExpression).Member.Name;
}
else
{
MemberExpression mLeft = null;
if (m.Expression.NodeType == ExpressionType.MemberAccess)
{
mLeft = m.Expression as MemberExpression;
}
else if (m.Expression.NodeType == ExpressionType.Call)
{
mLeft = (m.Expression as MethodCallExpression).Object as MemberExpression;
}
string name = TypeRuntimeInfoCache.GetRuntimeInfo(mLeft.Type).TableFullName;
innerAlias = _aliasGenerator.GetJoinTableAlias(name);
if (string.IsNullOrEmpty(innerAlias))
{
string keyLeft = mLeft.GetKeyWidthoutAnonymous();
if (this.NavMembers.Contains(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _aliasGenerator.GetNavTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _aliasGenerator.GetTableAlias(innerKey);
string alias2 = _aliasGenerator.GetNavTableAlias(outerKey);
// 补充与USING字符串同等间距的空白
if (_aliasGenerator.ReserveQty > 1 || index > 0)
{
jf.Append(_pad);
}
Type type = m.Type;
var typeRumtime2 = TypeRuntimeInfoCache.GetRuntimeInfo(type);
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
jf.AppendTable(typeRumtime2.TableSchema, typeRumtime2.TableName, typeRumtime2.IsTemporary);
jf.Append(' ');
jf.Append(alias2);
if (_onPhrase.Length > 0)
{
_onPhrase.Append(" AND ");
}
for (int i = 0; i < attribute.InnerKeys.Length; i++)
{
if (attribute.InnerKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
_onPhrase.Append(attribute.InnerKeys[i].Substring(7));
}
else
{
_onPhrase.Append(alias1);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.InnerKeys[i]);
}
_onPhrase.Append(" = ");
if (attribute.OuterKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
_onPhrase.Append(attribute.OuterKeys[i].Substring(7));
}
else
{
_onPhrase.Append(alias2);
_onPhrase.Append('.');
_onPhrase.AppendMember(attribute.OuterKeys[i]);
}
}
if (nav.Predicate != null)
{
string alias = _aliasGenerator.GetNavTableAlias(nav.Key);
var visitor = new NavPredicateExpressionVisitor(_aliasGenerator, _onPhrase, alias);
visitor.Visit(nav.Predicate);
}
if (index < this.NavMembers.Count - 1)
{
jf.Append(',');
jf.AppendNewLine();
}
}
}
/// <summary>
/// 添加导航属性关联
/// </summary>
protected override void TanslateNavMember()
{
if (base.NavMembers == null || base.NavMembers.Count == 0)
{
return;
}
// 如果有一对多的导航属性，肯定会产生嵌套查询。那么内层查询别名肯定是t0，所以需要清掉
if (this.HasMany)
{
_ag = new AliasGenerator(_ag.ReserveQty);
}
//开始产生LEFT JOIN 子句
ISqlBuilder builder = this.JoinFragment;
foreach (var nav in base.NavMembers)
{
string key = nav.Key;
MemberExpression m = nav.Expression;
TypeRuntimeInfo typeRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(m.Expression.Type);
ForeignKeyAttribute attribute = typeRuntime.GetMemberAttribute <ForeignKeyAttribute>(m.Member.Name);
string innerKey = string.Empty;
string outerKey = key;
string innerAlias = string.Empty;
if (!m.Expression.Visitable())
{
innerKey = m.Expression.NodeType == ExpressionType.Parameter
? (m.Expression as ParameterExpression).Name
: (m.Expression as MemberExpression).Member.Name;
}
else
{
MemberExpression mLeft = null;
if (m.Expression.NodeType == ExpressionType.MemberAccess)
{
mLeft = m.Expression as MemberExpression;
}
else if (m.Expression.NodeType == ExpressionType.Call)
{
mLeft = (m.Expression as MethodCallExpression).Object as MemberExpression;
}
string name = TypeRuntimeInfoCache.GetRuntimeInfo(mLeft.Type).TableFullName;
innerAlias = _ag.GetJoinTableAlias(name);
if (string.IsNullOrEmpty(innerAlias))
{
string keyLeft = mLeft.GetKeyWidthoutAnonymous();
if (base.NavMembers.Contains(keyLeft))
{
innerKey = keyLeft;
}
innerAlias = _ag.GetNavTableAlias(innerKey);
}
}
string alias1 = !string.IsNullOrEmpty(innerAlias) ? innerAlias : _ag.GetTableAlias(innerKey);
string alias2 = _ag.GetNavTableAlias(outerKey);
builder.AppendNewLine();
builder.Append("LEFT JOIN ");
Type type = m.Type;
if (type.IsGenericType)
{
type = type.GetGenericArguments()[0];
}
var typeRuntime2 = TypeRuntimeInfoCache.GetRuntimeInfo(type);
builder.AppendTable(typeRuntime2.TableSchema, typeRuntime2.TableFullName, typeRuntime2.IsTemporary);
builder.Append(" ");
builder.Append(alias2);
bool withNoLock = !typeRuntime2.IsTemporary && _isNoLock && !string.IsNullOrEmpty(_withNoLock);
if (withNoLock)
{
builder.Append(' ');
builder.Append(_withNoLock);
}
builder.Append(" ON ");
for (int i = 0; i < attribute.InnerKeys.Length; i++)
{
if (attribute.InnerKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
builder.Append(attribute.InnerKeys[i].Substring(7));
}
else
{
builder.Append(alias1);
builder.Append('.');
builder.AppendMember(attribute.InnerKeys[i]);
}
builder.Append(" = ");
if (attribute.OuterKeys[i].StartsWith(AppConst.CONSTANT_FOREIGNKEY, StringComparison.Ordinal))
{
builder.Append(attribute.OuterKeys[i].Substring(7));
}
else
{
builder.Append(alias2);
builder.Append('.');
builder.AppendMember(attribute.OuterKeys[i]);
}
if (i < attribute.InnerKeys.Length - 1)
{
builder.Append(" AND ");
}
}
if (nav.Predicate != null)
{
string alias = _ag.GetNavTableAlias(nav.Key);
var visitor = new NavPredicateExpressionVisitor(_ag, builder, alias);
visitor.Visit(nav.Predicate);
}
}
}