//public AppBox.Core.DataTable ToDataTable(params SelectItem[] selectItem)
//{
// return this.ToDataTable(0, -1, selectItem);
//}
//public AppBox.Core.DataTable ToDataTable(int topSize, params SelectItem[] selectItem)
//{
// return this.ToDataTable(topSize, -1, selectItem);
//}
//public AppBox.Core.DataTable ToDataTable(int pageSize, int pageIndex, params SelectItem[] selectItem)
//{
// if (selectItem == null || selectItem.Length <= 0)
// throw new System.ArgumentException("must select some one");
// this._topOrPageSize = pageSize;
// this._pageIndex = pageIndex;
// this._purpose = QueryPurpose.ToDataTable;
// foreach (var item in selectItem)
// {
// if (item.Target.Expression.Type == ExpressionType.SelectItemExpression)
// {
// SelectItemExpression si = (SelectItemExpression)item.Target.Expression;
// if (si.Owner == this)
// {
// SelectItemExpression tar = new SelectItemExpression(si.Expression, item.Target.AliasName);
// tar.Owner = this;
// this.Selects.Add(item.Target.AliasName, tar);
// }
// else
// this.Selects.Add(item.Target.AliasName, item.Target);
// }
// else
// this.Selects.Add(item.Target.AliasName, item.Target);
// }
// //递交查询
// var db = SqlStore.Get(this.StoreName);
// var cmd = db.DbCommandBuilder.CreateQueryCommand(this);
// return db.ExecuteToTable(cmd);
//}
/// <summary>
/// 查找FromQuery的目标Query的EntityExpression，用于获取IRuntimeContext执行查询或获取StoreName
/// </summary>
/// <returns>The sys context.</returns>
/// <param name="oq">Oq.</param>
private static EntityExpression FindTargetEntityExpression(SqlFromQuery oq)
{
var query = oq.Target as SqlQuery;
return(query != null ? query.T : FindTargetEntityExpression((SqlFromQuery)oq.Target));
}
private void BuildNormalQuery(ISqlSelectQuery query, BuildQueryContext ctx)
{
//设置上下文
ctx.BeginBuildQuery(query);
//构建Select
ctx.Append("Select ");
if (query.Purpose == QueryPurpose.ToDataTable && query.Distinct)
{
ctx.Append("Distinct ");
}
//构建Select Items
ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildSelect;
if (query.Purpose == QueryPurpose.Count)
{
ctx.Append("Count(*)");
}
else
{
foreach (var si in query.Selects.Values)
{
BuildSelectItem(si, ctx);
ctx.Append(",");
}
ctx.RemoveLastChar(); //移除最后多余的,号
}
//构建From
ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildFrom;
ctx.Append(" From ");
//判断From源
if (query is SqlFromQuery)
{
SqlFromQuery q = (SqlFromQuery)ctx.CurrentQuery;
//开始构建From子查询
ctx.Append("(");
BuildNormalQuery(q.Target, ctx);
ctx.Append(")");
ctx.AppendFormat(" {0}", ((SqlQueryBase)q.Target).AliasName);// ((QueryBase)query).AliasName);
}
else
{
SqlQuery q = (SqlQuery)ctx.CurrentQuery;
var model = Runtime.RuntimeContext.Current.GetModelAsync <EntityModel>(q.T.ModelID).Result;
ctx.AppendFormat("\"{0}\" {1}", model.GetSqlTableName(false, null), q.AliasName);
}
//构建Where
ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildWhere;
if (!Equals(null, ctx.CurrentQuery.Filter))
{
ctx.Append(" Where ");
BuildExpression(ctx.CurrentQuery.Filter, ctx);
}
//非分组的情况下构建Order By
if (query.Purpose != QueryPurpose.Count)
{
if (query.GroupByKeys == null && query.HasSortItems)
{
ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildOrderBy;
BuildOrderBy(query, ctx);
}
}
//构建Join
ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildJoin;
SqlQueryBase q1 = (SqlQueryBase)ctx.CurrentQuery;
if (q1.HasJoins) //先处理每个手工的联接及每个手工联接相应的自动联接
{
BuildJoins(q1.Joins, ctx);
}
ctx.BuildQueryAutoJoins(q1); //再处理自动联接
//处理Skip and Take
if (query.Purpose != QueryPurpose.Count)
{
ctx.CurrentQueryInfo.BuildStep = BuildQueryStep.BuildSkipAndTake;
if (query.SkipSize > 0)
{
ctx.AppendFormat(" Offset {0}", query.SkipSize);
}
if (query.Purpose == QueryPurpose.ToSingleEntity)
{
ctx.Append(" Limit 1 ");
}
else if (query.TakeSize > 0)
{
ctx.AppendFormat(" Limit {0} ", query.TakeSize);
}
}
//构建分组、Having及排序
BuildGroupBy(query, ctx);
//结束上下文
ctx.EndBuildQuery(query);
}