public void ResolveExpression(ResolveExpress re, Expression exp)
{
ResolveExpress.MemberType type = ResolveExpress.MemberType.None;
var expStr = exp.ToString();
var isNotBool = !expStr.Contains("True") && !expStr.Contains("False");
var isContainsNot = expStr.Contains("Not");
if (isContainsNot && expStr.Match(@" => Not\(.+?\)") && !expStr.Contains("Contains"))
{
this.SqlWhere = string.Format(" AND {0}=0 or {0} is null ", Regex.Match(expStr, @" => Not\(.+\.(.+?)\)").Groups[1].Value);
}
else if (isNotBool)
{
this.SqlWhere = string.Format(" AND {0} ", re.CreateSqlElements(exp, ref type));
}
else
{
var isTrue = Regex.IsMatch(expStr, @"\=\> True$");
var isFalse = Regex.IsMatch(expStr, @"\=\> False$");
if (isFalse)
{
this.SqlWhere = string.Format(" AND 1<>1 ");
}
else if (isTrue)
{
}
else
{
this.SqlWhere = string.Format(" AND {0} ", re.CreateSqlElements(exp, ref type));
}
}
}
/// <summary>
/// 查询分页记录
/// </summary>
/// <param name="ExpWhere">lamda表达式</param>
/// <param name="SqlOrderBy">取值排序字段，如：Id Asc,CreateTime Desc</param>
/// <param name="RecordCount">数据记录总数</param>
/// <param name="PageIndex">页码，默认1</param>
/// <param name="PageSize">页大小，默认20</param>
/// <param name="UseReadonlySource">是否实用只读数据源，true-是，false-否</param>
/// <returns></returns>
public static List <T> List(Expression <Func <T, bool> > ExpWhere, string SqlOrderBy, out long RecordCount, int PageIndex = 1, int PageSize = 20, bool UseReadonlySource = true)
{
ResolveExpress re = new Tool.ResolveExpress();
re.ResolveExpression(re, ExpWhere);
string SqlWhere = "1=1" + re.SqlWhere;
object[] SqlParams = re.SqlParams.ToArray();
return(List(SqlWhere, SqlOrderBy, out RecordCount, PageIndex, PageSize, UseReadonlySource, SqlParams));
}
/// <summary>
/// 查询统计信息
/// </summary>
/// <param name="ExpWhere">lamda表达式</param>
/// <param name="UseReadonlySource">是否实用只读数据源，true-是，false-否</param>
/// <returns></returns>
public static long Count(Expression <Func <T, bool> > ExpWhere, bool UseReadonlySource = true)
{
ResolveExpress re = new Tool.ResolveExpress();
re.ResolveExpression(re, ExpWhere);
string SqlWhere = "1=1" + re.SqlWhere;
string SqlText = SqlGenerator.SQLBUILDER_Count(DB.ORM_TabInfo, SqlWhere);
object[] SqlParams = re.SqlParams.ToArray();
Data.DBHelper db = new Data.DBHelper(DB.ORM_TabInfo.ORMConnectionMark, UseReadonlySource);
object CountObj = db.ExecTextScalar(SqlText, SqlParams);
if (CountObj != null && CountObj != DBNull.Value)
{
long CountVal = Convert.ToInt64(CountObj);
return(CountVal);
}
else
{
return(-1);
}
}