/// <summary>
/// 获得Where表达式
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="predicate"></param>
/// <param name="parameters"></param>
/// <returns></returns>
private static string GetBatchConditionQuery <TEntity>(Expression <Func <TEntity, bool> > predicate, List <SqlParameter> parameters)
where TEntity : class
{
ConditionBuilder conditionBuilder = new ConditionBuilder();
conditionBuilder.Build(predicate.Body);
if (!string.IsNullOrEmpty(conditionBuilder.Condition))
{
string condition = conditionBuilder.Condition;
for (int i = 0; i < conditionBuilder.Arguments.Length; i++)
{
condition = condition.Replace(string.Format("{{{0}}}", i), string.Format("@p{0}", parameters.Count));
parameters.Add(new SqlParameter(string.Format("@p{0}", parameters.Count), conditionBuilder.Arguments[i]));
}
return("Where " + condition);
}
return(null);
}
public int Delete <T>(Expression <Func <T, bool> > predicate) where T : class
{
string tableName = AttributesHelper.GetTableName <T>();
if (!string.IsNullOrEmpty(tableName))
{
string command = String.Format("DELETE FROM {0}", tableName);
ConditionBuilder conditionBuilder = new ConditionBuilder();
conditionBuilder.Build(predicate.Body);
if (!String.IsNullOrEmpty(conditionBuilder.Condition))
{
command += " WHERE " + conditionBuilder.Condition;
}
return(this.Database.ExecuteSqlCommand(command, conditionBuilder.Arguments));
}
return(0);
}
