/// <summary>
/// 将阅读器数据转换为实体列表
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public List <TEntity> DataTableToEntityList(SqlDataReader sdr)
{
//将阅读器数据转换成DataTable
var list = AttributeHelper.GetEntityColumnAtrributes <TEntity>();
DataTable dtTwo = new DataTable(tableName);
foreach (var model in list)
{
DataColumn dc = new DataColumn();
dc.ColumnName = model.propName;
dc.DataType = Type.GetType(model.typeName);
dtTwo.Columns.Add(dc);
}
while (sdr.Read())
{
DataRow drTwo = dtTwo.NewRow();
foreach (var model in list)
{
try
{
if (sdr[model.fieldName] != null)
{
drTwo[model.propName] = sdr[model.fieldName];
}
}catch { }
}
dtTwo.Rows.Add(drTwo);
}
return(ConvertEntityByEmit.GetList <TEntity>(dtTwo));
}
/// <summary>
/// 表达式路由
/// </summary>
/// <param name="exp"></param>
/// <returns></returns>
string ExpressionRouter(System.Linq.Expressions.Expression exp)
{
//获取实体列的特性
List <EntityPropColumnAttributes> columnAttrList = AttributeHelper.GetEntityColumnAtrributes <TEntity>();
string sb = string.Empty;
if (exp is System.Linq.Expressions.BinaryExpression)//二元运算符
{
System.Linq.Expressions.BinaryExpression be = ((System.Linq.Expressions.BinaryExpression)exp);
return(BinarExpressionProvider(be.Left, be.Right, be.NodeType));
}
else if (exp is System.Linq.Expressions.MemberExpression)//成员
{
System.Linq.Expressions.MemberExpression me = ((System.Linq.Expressions.MemberExpression)exp);
return(me.Member.Name);
}
else if (exp is System.Linq.Expressions.NewArrayExpression)//数组
{
System.Linq.Expressions.NewArrayExpression ae = ((System.Linq.Expressions.NewArrayExpression)exp);
StringBuilder tmpstr = new StringBuilder();
foreach (System.Linq.Expressions.Expression ex in ae.Expressions)
{
tmpstr.Append(ExpressionRouter(ex));
tmpstr.Append(",");
}
return(tmpstr.ToString(0, tmpstr.Length - 1));
}
else if (exp is System.Linq.Expressions.MethodCallExpression)//方法
{
return(MethodExpression(exp));
}
else if (exp is System.Linq.Expressions.ConstantExpression)
{
System.Linq.Expressions.ConstantExpression ce = ((System.Linq.Expressions.ConstantExpression)exp);
if (ce.Value == null)
{
return("null");
}
else if (ce.Value is ValueType)
{
return(ce.Value.ToString());
}
else if (ce.Value is string || ce.Value is DateTime || ce.Value is char)
{
//return string.Format("'{0}'", ce.Value.ToString());
return(string.Format("{0}", ce.Value.ToString()));
}
}
else if (exp is System.Linq.Expressions.UnaryExpression)
{
System.Linq.Expressions.UnaryExpression ue = ((System.Linq.Expressions.UnaryExpression)exp);
return(ExpressionRouter(ue.Operand));
}
return(null);
}
/// <summary>
/// 将数据表转换为实体列表
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public List <TEntity> DataTableToEntityList(DataTable dt)
{
if (dt == null)
{
return(new List <TEntity>());
}
var list = AttributeHelper.GetEntityColumnAtrributes <TEntity>();
DataTable dtTwo = new DataTable(tableName);
foreach (var model in list)
{
if (dt.Columns.Contains(model.fieldName))
{
DataColumn dc = new DataColumn();
dc.ColumnName = model.propName;
dc.DataType = dt.Columns[model.fieldName].DataType;
dtTwo.Columns.Add(dc);
}
}
foreach (DataRow dr in dt.Rows)
{
DataRow drTwo = dtTwo.NewRow();
foreach (var model in list)
{
if (dt.Columns.Contains(model.fieldName))
{
drTwo[model.propName] = dr[model.fieldName];
}
}
dtTwo.Rows.Add(drTwo);
}
return(ConvertEntityByEmit.GetList <TEntity>(dtTwo));
//List<TEntity> entityList = new List<TEntity>();
//foreach (DataRow dr in dt.Rows)
//{
// //实体
// TEntity entity = new TEntity();
// //循环属性
// foreach (PropertyInfo prop in entity.GetType().GetProperties())
// {
// //判断数据表中是否存在该列
// if (dt.Columns.Contains(prop.Name))
// {
// if (!string.IsNullOrEmpty(dr[prop.Name].ToStr()))
// {
// //Convert.ChangeType将对象转换为指定类型
// prop.SetValue(entity, Convert.ChangeType(dr[prop.Name], prop.PropertyType), null);
// }
// }
// }
// entityList.Add(entity);
//}
//return entityList;
}
/// <summary>
/// 获取主键
/// </summary>
/// <returns></returns>
public string GetPrimaryKey()
{
var list = AttributeHelper.GetEntityColumnAtrributes <TEntity>();
foreach (var model in list)
{
if (model.isPrimaryKey)
{
return(model.fieldName);
}
}
return("");
}
/// <summary>
/// 二元运算符表达式
/// </summary>
/// <param name="left"></param>
/// <param name="right"></param>
/// <param name="type"></param>
/// <returns></returns>
string BinarExpressionProvider(System.Linq.Expressions.Expression left, System.Linq.Expressions.Expression right, System.Linq.Expressions.ExpressionType type)
{
string where = "(";
//先处理左边
string leftStr = ExpressionRouter(left);
//获取实体列的特性
List <EntityPropColumnAttributes> columnAttrList = AttributeHelper.GetEntityColumnAtrributes <TEntity>();
var list = columnAttrList.Where(w => w.propName == leftStr);
if (list.Count() > 0)
{
EntityPropColumnAttributes columnAttribute = list.First();
leftStr = columnAttribute.fieldName;
}
//节点类型
string typeStr = ExpressionTypeCast(type);
//再处理右边
string rightStr = RightExpressionRouter(right).ToStr();
where += leftStr;
where += typeStr;
if (rightStr == "null")
{
if (where.EndsWith(" ="))
{
where = where.Substring(0, where.Length - 2) + " is null";
}
else if (where.EndsWith("<>"))
{
where = where.Substring(0, where.Length - 2) + " is not null";
}
}
else
{
//如果左侧包含（则代表左侧非字段
if (leftStr.Contains("("))
{
where += rightStr;
}
else
{
int num = random.Next(100, 999);
where += "@" + leftStr + num;
listPara.Add(new SqlParameter("@" + leftStr + num, rightStr));
}
}
return(where += ")");
}
public static DataTableEntityBuilder <T> CreateBuilder(DataRow dr)
{
DataTableEntityBuilder <T> dynamicBuilder = new DataTableEntityBuilder <T>();
DynamicMethod method = new DynamicMethod("DynamicCreateEntity", typeof(T), new Type[] { typeof(DataRow) }, typeof(T), true);
ILGenerator generator = method.GetILGenerator();
LocalBuilder result = generator.DeclareLocal(typeof(T));
generator.Emit(OpCodes.Newobj, typeof(T).GetConstructor(Type.EmptyTypes));
generator.Emit(OpCodes.Stloc, result);
var attributeList = AttributeHelper.GetEntityColumnAtrributes <T>();
for (int i = 0; i < dr.ItemArray.Length; i++)
{
var list = attributeList.Where(w => w.fieldName.ToLower() == dr.Table.Columns[i].ColumnName.ToLower());
if (list.Count() > 0)
{
PropertyInfo pi = typeof(T).GetProperty(list.First().propName);
Label endIfLabel = generator.DefineLabel();
if (pi != null && pi.GetSetMethod() != null)
{
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, isDBNullMethod);
generator.Emit(OpCodes.Brtrue, endIfLabel);
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ldarg_0);
generator.Emit(OpCodes.Ldc_I4, i);
generator.Emit(OpCodes.Callvirt, getValueMethod);
generator.Emit(OpCodes.Unbox_Any, pi.PropertyType);
generator.Emit(OpCodes.Callvirt, pi.GetSetMethod());
generator.MarkLabel(endIfLabel);
}
}
}
generator.Emit(OpCodes.Ldloc, result);
generator.Emit(OpCodes.Ret);
dynamicBuilder.handler = (Load)method.CreateDelegate(typeof(Load));
return(dynamicBuilder);
}
/// <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);
}
