public static SqlAnalyseResult Analyse(IMappingProvider mappingProvider, object entityType, SortedDictionary <IPropertyExpression, string> taskPropertyNames)
{
if (!Config.UseExpressionAnalyseCache)
{
SqlAnalyseResult sqlAnalyseResult = new SqlAnalyseResult();
int tableIndexCounter = 0;
int outputColumnIndexCounter = 0;//注意在.net中输出的列是从0开始的
sqlAnalyseResult.ObjectFiller.EntityType = entityType;
AnalyseInner(mappingProvider, entityType, sqlAnalyseResult, sqlAnalyseResult.ObjectFiller, taskPropertyNames, null, ref tableIndexCounter, ref outputColumnIndexCounter);
return(sqlAnalyseResult);
}
//注意不同实体类型可能有相同的字段因此必须传入entityType
string hashKey = GetHashKey(entityType, taskPropertyNames);
if (!SqlAnalyseResults.ContainsKey(hashKey))
{
lock (SqlAnalyseResultsLock)
{
if (!SqlAnalyseResults.ContainsKey(hashKey))
{
SqlAnalyseResult sqlAnalyseResult = new SqlAnalyseResult();
int tableIndexCounter = 0;
int outputColumnIndexCounter = 0;//注意在.net中输出的列是从0开始的
sqlAnalyseResult.ObjectFiller.EntityType = entityType;
AnalyseInner(mappingProvider, entityType, sqlAnalyseResult, sqlAnalyseResult.ObjectFiller, taskPropertyNames, null, ref tableIndexCounter, ref outputColumnIndexCounter);
//添加到缓存
SqlAnalyseResults.Add(hashKey, sqlAnalyseResult);
}
}
}
return(SqlAnalyseResults[hashKey]);
}
private static void AnalyseInner(IMappingProvider mappingProvider, object entityType,
SqlAnalyseResult sqlAnalyseResult, ObjectFiller objectFiller,
IDictionary <IPropertyExpression, string> taskPropertyNames, string prefix,
ref int tableIndexCounter, ref int outputColumnIndexCounter
)
{
ITable table = mappingProvider.GetTable(entityType);
string currentTableNameAlias = "t" + tableIndexCounter;
if (prefix == null)
{
//前缀为null时表示是起始对象
sqlAnalyseResult.MasterEntityType = entityType;
sqlAnalyseResult.MasterTableNameAlias = currentTableNameAlias;
}
Dictionary <string, Dictionary <IPropertyExpression, string> > taskObjects = new Dictionary <string, Dictionary <IPropertyExpression, string> >(StringComparer.OrdinalIgnoreCase);
objectFiller.PropertyFillers = new List <PropertyFiller>();
foreach (IPropertyExpression propertyName in taskPropertyNames.Keys)
{
PrefixParser prefixParser = new PrefixParser(propertyName.PropertyName);
if (prefixParser.HasPrefix)
{
//说明是外键对象的属性，例如"Person.City.CityId"
if (!taskObjects.ContainsKey(prefixParser.Prefix))
{
taskObjects.Add(prefixParser.Prefix, new Dictionary <IPropertyExpression, string>());
}
taskObjects[prefixParser.Prefix].Add(new PropertyExpression(prefixParser.PropertyName, propertyName.GroupFunction), taskPropertyNames[propertyName]);
}
else
{
//说明是本对象的属性
string joinedPropertyName = PrefixParser.JoinPrefix(prefix, propertyName.PropertyName);
IColumn column = null;
if (joinedPropertyName == "***")
{
//伪造一个column
//column = sqlProvider.CreateCountColumn();
}
else
{
//如果不为***则column不会为null
if (!table.Columns.ContainsKey(propertyName.PropertyName))
{
throw new MissingMemberException(entityType.ToString(), propertyName.PropertyName);
}
column = table.Columns[propertyName.PropertyName];
}
if (!sqlAnalyseResult.HasGroup && propertyName.GroupFunction != GroupFunction.None)
{
sqlAnalyseResult.HasGroup = true;
}
//sqlColumn
SqlColumn sqlColumn = new SqlColumn();
sqlColumn.FullPropertyName = new PropertyExpression(joinedPropertyName, propertyName.GroupFunction);
sqlColumn.Column = column;
//oracle等数据库需要别名
StringBuilder sb = new StringBuilder();
if (propertyName.GroupFunction != GroupFunction.None)
{
sb.Append(propertyName.GroupFunction.ToString());
sb.Append("(");
}
if (propertyName.GroupFunction == GroupFunction.Count)
{
sb.Append("*");
}
else
{
sb.Append(currentTableNameAlias);
sb.Append(".");
sb.Append(column.ColumnName);
}
if (propertyName.GroupFunction != GroupFunction.None)
{
sb.Append(")");
}
sqlColumn.TableAliasAndColumn = sb.ToString();
//filler
if (taskPropertyNames[propertyName] != null)
{
//只有输出字段才有PropertyFiller
PropertyFiller propertyFiller = new PropertyFiller();
if (propertyName.GroupFunction == GroupFunction.None)
{
propertyFiller.PropertyName = column.PropertyName;
propertyFiller.PropertyType = column.PropertyType;
}
else
{
if (!table.GroupColumns.ContainsKey(propertyName))
{
throw new MissingMemberException(string.Format("类型{0}缺少标记为GroupFunction.{1}的GroupColumnAttribute", entityType, propertyName.GroupFunction));
}
IGroupColumn groupColumn = table.GroupColumns[propertyName];
propertyFiller.PropertyName = groupColumn.PropertyName;
propertyFiller.PropertyType = groupColumn.PropertyType;
}
propertyFiller.ColumnIndex = outputColumnIndexCounter;
string outputSqlColumn = taskPropertyNames[propertyName];
if (outputSqlColumn == "")
{
//如果为空格，则使用默认f开头的计数器作为别名
sb.Append(" f");
sb.Append(outputColumnIndexCounter);
outputColumnIndexCounter++;
outputSqlColumn = sb.ToString();
}
sqlAnalyseResult.SortedOutputColumns.Add(outputSqlColumn);
objectFiller.PropertyFillers.Add(propertyFiller);
}
sqlAnalyseResult.SqlColumns.Add(sqlColumn.FullPropertyName, sqlColumn);
}
}
//分析父对象，必须在自己属性分析完后才进行
objectFiller.ObjectFillers = new List <ObjectFiller>();
foreach (string objectPeropertyName in taskObjects.Keys)
{
string tableNameAlias = "t" + ++tableIndexCounter;
if (!table.Relations.ContainsKey(objectPeropertyName))
{
throw new MissingMemberException(entityType.ToString(), objectPeropertyName);
}
IRelation relation = table.Relations[objectPeropertyName];
SqlTable sqlTable = new SqlTable();
sqlTable.TableNameAlias = currentTableNameAlias;
sqlTable.ForeignTableNameAlias = tableNameAlias;
sqlTable.ForeignEntityType = relation.ForeignEntityType;
List <SqlRelationColumn> sqlRelationColumns = new List <SqlRelationColumn>();
foreach (IRelationColumn relationColumn in relation.RelationColumns)
{
SqlRelationColumn sqlRelationColumn = new SqlRelationColumn();
sqlRelationColumn.ColumnName = relationColumn.ColumnName;
sqlRelationColumn.ForeignColumnName = relationColumn.ForeignColumnName;
StringBuilder sb = new StringBuilder();
sb.Append(sqlTable.TableNameAlias);
sb.Append('.');
sb.Append(relationColumn.ColumnName);
sb.Append('=');
sb.Append(sqlTable.ForeignTableNameAlias);
sb.Append('.');
sb.Append(relationColumn.ForeignColumnName);
sqlRelationColumn.Expression = sb.ToString();
sqlRelationColumns.Add(sqlRelationColumn);
}
sqlTable.RelationColumns = sqlRelationColumns;
sqlAnalyseResult.ForeignTables.Add(sqlTable);
ObjectFiller subObjectFiller = new ObjectFiller();
subObjectFiller.PropertyName = relation.PropertyName;
subObjectFiller.EntityType = relation.ForeignEntityType;
objectFiller.ObjectFillers.Add(subObjectFiller);
//AnalyseInner(sqlProvider, relation.PropertyAdapter.PropertyType, sqlAnalyseResult, subObjectFiller,taskObjects[objectPeropertyName], objectPeropertyName, tableIndexCounter, outputColumnIndexCounter);
string joinedPropertyName = PrefixParser.JoinPrefix(prefix, relation.PropertyName);
AnalyseInner(mappingProvider, relation.ForeignEntityType, sqlAnalyseResult, subObjectFiller, taskObjects[relation.PropertyName], joinedPropertyName, ref tableIndexCounter, ref outputColumnIndexCounter);
}
}
