/// <summary>
/// ConditionBuilder 并不支持生成Like操作，如 字符串的 StartsWith，Contains，EndsWith 并不能生成这样的SQL： Like ‘xxx%’, Like ‘%xxx%’ , Like ‘%xxx’ . 只要override VisitMethodCall 这个方法即可实现上述功能。
/// </summary>
/// <param name="m"></param>
/// <returns></returns>
protected override Expression VisitMethodCall(MethodCallExpression m)
{
string connectorWords = GetLikeConnectorWords(m_dataBaseType); //获取like链接符
if (m == null)
{
return(m);
}
string format;
switch (m.Method.Name)
{
case "StartsWith":
format = "({0} LIKE ''" + connectorWords + "{1}" + connectorWords + "'%')";
break;
case "Contains":
format = "({0} LIKE '%'" + connectorWords + "{1}" + connectorWords + "'%')";
break;
case "EndsWith":
format = "({0} LIKE '%'" + connectorWords + "{1}" + connectorWords + "'')";
break;
case "Equals":
// not in 或者 in 或 not like
format = "{0} {1} ";
break;
case "Parse":
format = "{1}";
break;
case "IsNull":
if (m.Method.ReflectedType == typeof(SqlColumnUtil))
{
object obj = TypeUtil.GetSqlDataTypeValue(m.Arguments[1], m.Arguments[1].Type);
format = "isnull({1}," + obj.ToString().Replace("\"", "") + ")";
}
else
{
format = "({1})";
throw new NotSupportedException(m.NodeType + " is not supported!");
}
break;
default:
if (m.Method.ReturnType == typeof(int))
{
if (DataBaseType.SqlServer.Equals(m_dataBaseType))
{
format = "convert(int,{1})";
break;
}
}
throw new NotSupportedException(m.NodeType + " is not supported!");
}
if (m.Object != null)
{
this.Visit(m.Object);
}
this.Visit(m.Arguments[0]);
string right = this.m_conditionParts.Pop();
string left = string.Empty;
if (m.Object != null)
{
left = this.m_conditionParts.Pop();
}
this.m_conditionParts.Push(string.Format(format, left, right));
return(m);
}
/// <summary>
/// 实体列表转DataTable
/// </summary>
/// <typeparam name="T">实体类</typeparam>
/// <param name="modelList">实体列表</param>
/// <returns></returns>
public static DataTable ModelList2DataTable <T>(List <T> modelList)
{
if (modelList == null)
{
return(null);
}
DataTable dataTable = new DataTable();
var model = modelList[0];
Type t = model.GetType();//获得该类的Type
//创建表结构、设置字段信息
foreach (PropertyInfo pi in t.GetProperties())
{
DataColumn dataColumn = new DataColumn();
ModelAttribute attr = (ModelAttribute)Attribute.GetCustomAttribute(pi, typeof(ModelAttribute));// 属性值
if (attr != null)
{
dataColumn.ColumnName = attr.ColumnName;
dataColumn.DataType = TypeUtil.GetType(attr.ColumnType);
dataColumn.Caption = attr.ColumnTitle;
if (attr.IsPrimaryKey)
{
dataColumn.Unique = true;
}
}
else
{
object value = pi.GetValue(model, null);
dataColumn.ColumnName = pi.Name;
if (value != null)
{
dataColumn.DataType = value.GetType();
}
//else
//{
// dataColumn.DataType = typeof(string);
//}
}
dataTable.Columns.Add(dataColumn);
}
//添加行数据
foreach (var m in modelList)
{
object[] values = new object[t.GetProperties().Length];
int idx = 0;
foreach (PropertyInfo pi in t.GetProperties())
{
object value = pi.GetValue(model, null);
//ModelAttribute attr = (ModelAttribute)Attribute.GetCustomAttribute(pi, typeof(ModelAttribute));// 属性值
//if (attr != null && !string.IsNullOrEmpty(attr.ColumnType))
//{
// value = pi.GetValue(model, null);
//}
//else
//{
// value = pi.GetValue(model, null);
//}
values[idx] = value;
idx++;
}
dataTable.Rows.Add(values);
}
return(dataTable);
}
