/// <summary>
/// 根据ID载入实体
/// </summary>
/// <param name="id">实体对象的Id</param>
/// <param name="fetchType">加载对象的方式,例如是否加载引用对象和集合属性</param>
public void Load(long id, Fetch fetchType)
{
this.Id = id;
string sqlPattern = string.Empty;
string sql = string.Empty;
StringBuilder sbSelectStr = new StringBuilder();
string strLeftJoin = string.Empty;
DataSet ds = null;
sbSelectStr.Append(string.Format("{0}.id as E_{0}Id,{0}.*", EInfo.EntityName));
sqlPattern = "select {0} from {1} {2} where {1}.id={3}";
strLeftJoin = DBSQLiteHelper.GenerateLeftJoinSQL(EInfo.References, ref sbSelectStr, fetchType);
strLeftJoin += DBSQLiteHelper.GenerateSetSQL(EInfo.Sets, ref sbSelectStr, fetchType);
if (EInfo.REFSelf)
{
strLeftJoin += DBSQLiteHelper.GenerateREFSelfSQL(EInfo, ref sbSelectStr, fetchType);
}
sql = string.Format(sqlPattern, sbSelectStr.ToString(), EInfo.EntityName, strLeftJoin, id);
ds = DBSQLiteHelper.ExecuteQuery(sql);
if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
{
foreach (FieldAttribute pinfo in EInfo.Properties)
{
DBSQLiteHelper.FetchPropertyValue(this, pinfo, ds.Tables[0], 0);
}
foreach (REFAttribute refAtt in EInfo.References)
{
if ((fetchType == Fetch.Default && !refAtt.LazyLoad) || fetchType == Fetch.REFS || fetchType == Fetch.REFSandSets)
{
DBSQLiteHelper.FetchREFEntity(this, refAtt, ds.Tables[0]);
}
}
foreach (SETAttribute setAtt in EInfo.Sets)
{
if ((fetchType == Fetch.Default && !setAtt.LazyLoad) || fetchType == Fetch.SETS || fetchType == Fetch.REFSandSets)
{
DBSQLiteHelper.FetchSet(this, setAtt, ds.Tables[0]);
}
}
//如果实体有对自身实体对象的引用
if (EInfo.REFSelf)
{
if (fetchType == Fetch.REFS)
{
DBSQLiteHelper.FetchParent(this, ds.Tables[0], 0);
}
else if (fetchType == Fetch.SETS)
{
DBSQLiteHelper.FetchChildren(this, ds.Tables[0]);
}
else if (fetchType == Fetch.REFSandSets)
{
DBSQLiteHelper.FetchParent(this, ds.Tables[0], 0);
DBSQLiteHelper.FetchChildren(this, ds.Tables[0]);
}
}
}
}
public virtual void DeleteAll()
{
if (this.Id == 0)
{
throw new OOEngineException("此对象尚未被持久化,无法执行删除操作!");
}
string sqlPattern = "delete from {0};";
string sql = string.Format(sqlPattern, EInfo.EntityName);
try
{
DBSQLiteHelper.ExecuteUpdate(sql);
}
catch (Exception e)
{
throw new OOEngineException("在删除持久化对象时发生异常!" + e.Message);
}
}
} //order by ProjectCode
/// <summary>
/// 排序
/// </summary>
/// <param name="fetchType"></param>
/// <param name="GetDataTable"></param>
/// <param name="order">order by ProjectCode</param>
public EntitySet(Fetch fetchType, bool GetDataTable, string order)
{
string sqlPattern = string.Empty;
StringBuilder sbSelectStr = new StringBuilder();
string strLeftJoin = string.Empty;
string sql = string.Empty;
DataSet ds = null;
sbSelectStr.Append(string.Format("{0}.id as E_{0}Id,{0}.*", EInfo.EntityName));
sqlPattern = "select {0} from {1} {2}";
if (!string.IsNullOrEmpty(order))
{
sqlPattern += " " + order;
}
strLeftJoin = DBSQLiteHelper.GenerateLeftJoinSQL(EInfo.References, ref sbSelectStr, fetchType);
strLeftJoin += DBSQLiteHelper.GenerateSetSQL(EInfo.Sets, ref sbSelectStr, fetchType);
if (EInfo.REFSelf)
{
strLeftJoin += DBSQLiteHelper.GenerateREFSelfSQL(EInfo, ref sbSelectStr, fetchType);
}
sql = string.Format(sqlPattern, sbSelectStr.ToString(), EInfo.EntityName, strLeftJoin);
ds = DBSQLiteHelper.ExecuteQuery(sql);
if (GetDataTable)
{
EntityDataTable = this.AddIndexToTable(ds.Tables[0]);
return;
}
else
{
if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
{
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
long rEntityId = Convert.ToInt64(ds.Tables[0].Rows[i][EInfo.IdNameInSelect]);
if (i == 0 || (EntityList.Count > 0 && ((BaseEntity)EntityList[EntityList.Count - 1]).Id != rEntityId))
{
EntityList.Add((T)DBSQLiteHelper.FetchEntity(EInfo, fetchType, ds.Tables[0], i));
}
}
}
}
}
/// <summary>
/// 根据从数据库检索出的数据集从中组装出实体对象实例
/// </summary>
/// <param name="einfo">实体对象媒数据</param>
/// <param name="fetchType">关联对象加载方式</param>
/// <param name="table">数据集</param>
/// <param name="rowIndex">实体对象所处的数据集行数</param>
/// <returns>实体对象实例</returns>
public static BaseEntity FetchEntity(EntityInfo einfo, Fetch fetchType, DataTable table, int rowIndex)
{
BaseEntity entity = (BaseEntity)DLLAnalysis.GetEntityInstance(einfo.EntityName);
entity.Id = Convert.ToInt64(table.Rows[rowIndex][einfo.IdNameInSelect]);
foreach (FieldAttribute pinfo in einfo.Properties)
{
DBSQLiteHelper.FetchPropertyValue(entity, pinfo, table, rowIndex);
}
foreach (REFAttribute refAtt in einfo.References)
{
if ((fetchType == Fetch.Default && !refAtt.LazyLoad) || fetchType == Fetch.REFS || fetchType == Fetch.REFSandSets)
{
DBSQLiteHelper.FetchREFEntity(entity, refAtt, table);
}
}
foreach (SETAttribute setAtt in einfo.Sets)
{
if ((fetchType == Fetch.Default && !setAtt.LazyLoad) || fetchType == Fetch.SETS || fetchType == Fetch.REFSandSets)
{
DBSQLiteHelper.FetchSet(entity, setAtt, table);
}
}
//如果实体有对自身实体对象的引用
if (einfo.REFSelf)
{
if (fetchType == Fetch.REFS)
{
FetchParent(entity, table, rowIndex);
}
else if (fetchType == Fetch.SETS)
{
FetchChildren(entity, table);
}
else if (fetchType == Fetch.REFSandSets)
{
FetchParent(entity, table, rowIndex);
FetchChildren(entity, table);
}
}
return(entity);
}
/// <summary>
/// 更新持久化对象的属性
/// </summary>
public void Update()
{
if (this.Id == 0)
{
throw new OOEngineException("此对象尚未被持久化,请先执行新增操作后再执行此方法!");
}
string sqlPattern = "update {0} set {1} where Id={2};";
StringBuilder sbSetValue = new StringBuilder();
foreach (FieldAttribute pinfo in EInfo.Properties)
{
if (sbSetValue.Length > 0)
{
sbSetValue.Append(",");
}
sbSetValue.Append(string.Format("{0}={1}", pinfo.FieldName, DLLAnalysis.GetPropertyValue(this, pinfo)));
}
foreach (REFAttribute refobj in EInfo.References)
{
if (sbSetValue.Length > 0)
{
sbSetValue.Append(",");
}
sbSetValue.Append(string.Format("{0}={1}", refobj.REFFieldName, DLLAnalysis.GetReferenceEntityId(this, refobj.PropertyName)));
}
if (EInfo.REFSelf)
{
if (sbSetValue.Length > 0)
{
sbSetValue.Append(",");
}
sbSetValue.Append(string.Format("ParentId={0}", DLLAnalysis.GetReferenceEntityId(this, "Parent" + EInfo.EntityName)));
}
string sql = string.Format(sqlPattern, EInfo.EntityName, sbSetValue.ToString(), this.Id);
DBSQLiteHelper.ExecuteUpdate(sql);
}
/// <summary>
/// 将新创建的实体插入数据库,如果该实体并不是新建的,则会抛出异常
/// </summary>
public virtual void Insert()
{
if (this.Id > 0)
{
throw new OOEngineException("对象已经被持久化,不能在此对象上执行新增操作!");
}
//try
//{
string sqlPattern = "insert into {0}({1}) values({2});select last_insert_rowid() newid;";
StringBuilder sbFieldNameList = new StringBuilder();
StringBuilder sbFieldValueList = new StringBuilder();
//常规属性
foreach (FieldAttribute pinfo in EInfo.Properties)
{
if (sbFieldNameList.Length > 0)
{
sbFieldNameList.Append(",");
}
sbFieldNameList.Append(pinfo.FieldName);
if (sbFieldValueList.Length > 0)
{
sbFieldValueList.Append(",");
}
sbFieldValueList.Append(DLLAnalysis.GetPropertyValue(this, pinfo));
}
//引用属性
foreach (REFAttribute refobj in EInfo.References)
{
if (sbFieldNameList.Length > 0)
{
sbFieldNameList.Append(",");
}
//将实体中的REFEntityName转变为数据库表的字段EntityNameId
sbFieldNameList.Append(refobj.REFFieldName);
if (sbFieldValueList.Length > 0)
{
sbFieldValueList.Append(",");
}
sbFieldValueList.Append(DLLAnalysis.GetReferenceEntityId(this, refobj.PropertyName));
}
if (EInfo.REFSelf)
{
if (sbFieldNameList.Length > 0)
{
sbFieldNameList.Append(",");
}
//将实体中的REFEntityName转变为数据库表的字段EntityNameId
sbFieldNameList.Append("ParentId");
if (sbFieldValueList.Length > 0)
{
sbFieldValueList.Append(",");
}
sbFieldValueList.Append(DLLAnalysis.GetReferenceEntityId(this, "Parent" + EInfo.EntityName));
}
string sql = string.Format(sqlPattern, EInfo.EntityName, sbFieldNameList.ToString(), sbFieldValueList.ToString());
int newid = DBSQLiteHelper.ExecuteScalar(sql);
this.Id = Convert.ToInt64(newid);
//}
//catch (Exception e)
//{
// throw new OOEngineException("在持久化新实体对象时发生异常,地址:BaseEntity.Insert(),具体信息:"+e.Message);
//}
}