/// <summary>
/// 分页查询，基础方法，参数：页面大小，页码，主键，查询字段，表达式，排序，数据总条数
/// </summary>
/// <param name="pageSize">页面大小</param>
/// <param name="pageIndex">页码</param>
/// <param name="primaryKey">主键</param>
/// <param name="selectFields">查询字段</param>
/// <param name="express">表达式</param>
/// <param name="orderBy">排序</param>
/// <param name="recordCount">数据总条数</param>
/// <returns></returns>
private List <TEntity> Search(int pageSize, int pageIndex, string primaryKey, string selectFields, List <Expression> express, string orderBy, ref int recordCount)
{
//获取参数和条件
CoreFrameworkEntity CoreFrameworkEntity = GetParaListAndWhere(express);
//条件
string where = CoreFrameworkEntity.where;
//参数列表
List <SqlParameter> listPara = CoreFrameworkEntity.paraList;
selectFields = selectFields == "" ? "*" : selectFields;//查询字段
Pager page = new Pager();
IDataReader sdr = page.GetPagerInfo(tableName, primaryKey, selectFields, pageSize, pageIndex, where, orderBy, ref recordCount, listPara);
return(DynamicBuilder <TEntity> .GetList(sdr, columnAttrList));
}
/// <summary>
/// 不分页查询,基础方法
/// </summary>
/// <param name="count">显示总数，空则全部显示</param>
/// <param name="selectFields">查询字段</param>
/// <param name="express">表达式</param>
/// <param name="orderBy">排序,为空则不排序</param>
/// <returns></returns>
private List <TEntity> Search(int?count, string selectFields, List <Expression> express, string orderBy)
{
//获取参数和条件
CoreFrameworkEntity CoreFrameworkEntity = GetParaListAndWhere(express);
//条件
string where = CoreFrameworkEntity.where;
//参数列表
List <SqlParameter> listPara = CoreFrameworkEntity.paraList;
selectFields = selectFields == "" ? "*" : selectFields; //查询字段
orderBy = orderBy == "" ? "" : "order by " + orderBy; //排序
string topStr = count.HasValue == false ? "" : " top " + count + " ";
string cmdText = "select " + topStr + selectFields + " from " + tableName + " where " + where + " " + orderBy;
IDataReader sdr = new SqlConvertHelper().ExecuteReader(cmdText, listPara);
return(DynamicBuilder <TEntity> .GetList(sdr, columnAttrList));
}
/// <summary>
/// 获取Lambda表达式返回的结果
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="func"></param>
/// <returns></returns>
public CoreFrameworkEntity GetLambdaEntity <T>(System.Linq.Expressions.Expression <Func <T, bool> > func)
{
listPara.Clear();
CoreFrameworkEntity lambdaEntity = new CoreFrameworkEntity();
// 二元运算符表达式
if (func.Body is System.Linq.Expressions.BinaryExpression)
{
System.Linq.Expressions.BinaryExpression be = ((System.Linq.Expressions.BinaryExpression)func.Body);
lambdaEntity.where = BinarExpressionProvider(be.Left, be.Right, be.NodeType);
lambdaEntity.paraList = listPara;
}
// 单纯的静态方法
if (func.Body is System.Linq.Expressions.MethodCallExpression)
{
System.Linq.Expressions.MethodCallExpression be = ((System.Linq.Expressions.MethodCallExpression)func.Body);
lambdaEntity.where = ExpressionRouter(be);
lambdaEntity.paraList = listPara;
}
return(lambdaEntity);
}
/// <summary>
/// 获取表达式列表对应的参数列表和条件
/// </summary>
/// <param name="express"></param>
/// <returns></returns>
public CoreFrameworkEntity GetParaListAndWhere(List <Expression> express)
{
//获取实体列的特性
List <EntityPropColumnAttributes> columnAttrList = AttributeHelper.GetEntityColumnAtrributes <TEntity>();
#region 获取参数和条件
//参数列表
List <SqlParameter> listPara = new List <SqlParameter>();
//条件
string where = "";
if (express != null)
{
if (express.Count == 0)
{
where = "1=1";
}
int i = 0;//运行的位置，从下标0开始
foreach (Expression exp in express)
{
string fieldName = columnAttrList.Where(w => w.propName.ToLower() == exp.FieldName.ToLower()).Count() > 0
? columnAttrList.Where(w => w.propName.ToLower() == exp.FieldName.ToLower()).First().fieldName : exp.FieldName;
//连接符号
if (string.IsNullOrEmpty(exp.Join))
{
//判断个数是为了防止参数名相同
int fieldCount = express.Where(e => e.FieldName == exp.FieldName).Count();
string paraName = fieldCount == 1 ? exp.FieldName : exp.FieldName + "_p" + i.ToStr();
//当两个条件没有使用连接符时，则默认用and拼接,从第一个参数后试用
if (i > 0)
{
//如果上一个参数不是连接符时，默认每个参数是以and的形式拼接
if (string.IsNullOrEmpty(express[i - 1].Join))
{
where += " and ";
}
}
#region 条件语句
switch (exp.Condition.Trim())
{
case "like":
listPara.Add(new SqlParameter("@" + paraName, "%" + exp.Value + "%"));
where += " " + fieldName + " like @" + paraName;
break;
case "in":
where += " " + fieldName + " in (" + exp.Value + ")";
break;
default:
listPara.Add(new SqlParameter("@" + paraName, exp.Value));
where += " " + fieldName + " " + exp.Condition + " @" + paraName;
break;
}
#endregion
}
else
{
where += " " + exp.Join + " ";
}
i++;
}
}
else
{
where = "1=1";
}
#endregion
CoreFrameworkEntity entity = new CoreFrameworkEntity();
entity.paraList = listPara;
entity.where = where;
return(entity);
}