/// <summary>
/// 建構函式。
/// </summary>
/// <param name="programDefine">程式定義。</param>
/// <param name="tableName">資料表名稱。</param>
/// <param name="selectFields">取回欄位集合字串。</param>
/// <param name="filterItems">過濾條件項目集合。</param>
/// <param name="sortFields">排序欄位集合。</param>
public GTableJoinBuilder(GProgramDefine programDefine, string tableName, string selectFields, GFilterItemCollection filterItems, GSortFieldCollection sortFields)
{
ProgramDefine = programDefine;
TableName = tableName;
SelectFields = selectFields;
FilterItems = filterItems;
SortFields = sortFields;
}
/// <summary>
/// 取得排序欄位集合。
/// </summary>
private GSortFieldCollection GetSortFields(GTableDefine tableDefine)
{
GSortFieldCollection oSortFields;
// 取得排序欄位集合複本
oSortFields = new GSortFieldCollection();
foreach (GSortField sortField in tableDefine.SortFields)
{
oSortFields.Add(sortField.Clone());
}
return(oSortFields);
}
/// <summary>
/// 建置資料表關連資訊。
/// </summary>
/// <param name="programDefine">程式定義。</param>
/// <param name="tableName">資料表名稱。</param>
/// <param name="selectFields">取回欄位集合字串。</param>
/// <param name="filterItems">過濾條件項目集合。</param>
/// <param name="sortFields">排序欄位集合。</param>
public void Execute(GProgramDefine programDefine, string tableName, string selectFields, GFilterItemCollection filterItems, GSortFieldCollection sortFields)
{
this.ProgramDefine = programDefine;
this.TableName = tableName;
var oBuilder = new GTableJoinBuilder(programDefine, tableName, selectFields, filterItems, sortFields);
oBuilder.Execute(this);
}
/// <summary>
/// 取得排序語法。
/// </summary>
/// <param name="helper">資料庫命令輔助類別。</param>
/// <param name="provider">資料表關連資訊提供者。</param>
/// <param name="tableDefine">資料表定義。</param>
/// <param name="sortFields">排序欄位集合。</param>
private string GetSortCommandText(IDbCommandHelper helper, GTableJoinProvider provider, GTableDefine tableDefine, GSortFieldCollection sortFields)
{
StringBuilder oBuilder;
GFieldDefine oFieldDefine;
string sDbFieldName;
string sSortDirection;
// 無排序欄位則傳回空字串
if (BaseFunc.IsEmpty(sortFields) || !sortFields.Any())
{
return(string.Empty);
}
oBuilder = new StringBuilder();
foreach (GSortField sortField in sortFields)
{
// 取得包含資料表別名的欄位名稱
oFieldDefine = tableDefine.Fields[sortField.FieldName];
sDbFieldName = provider.GetDbFieldName(helper, oFieldDefine);
// 排序方式
sSortDirection = sortField.SortDirection == ESortDirection.Ascending ? "ASC" : "DESC";
if (oBuilder.Length > 0)
{
oBuilder.Append(", ");
}
oBuilder.Append(StrFunc.StrFormat("{0} {1}", sDbFieldName, sSortDirection));
}
return(" Order By " + oBuilder.ToString());
}
