/// <summary>
/// 自定义删除扩展
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="context"></param>
/// <param name="predicate">删除条件</param>
/// <returns></returns>
public static bool MangoRemove <TEntity>(this DbContext context, Expression <Func <TEntity, bool> > predicate) where TEntity : class, new()
{
TSqlAssembledResult result = TSqlAssembled.Delete <TEntity>(predicate);
context.Database.ExecuteSqlCommand(result.SqlStr);
return(context.SaveChanges() > 0 ? true : false);
}
/// <summary>
/// 更新语句组装
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="fields"></param>
/// <param name="predicate"></param>
/// <returns></returns>
public static TSqlAssembledResult Update <TEntity>(Expression <Func <TEntity, bool> > fields, Expression <Func <TEntity, bool> > predicate) where TEntity : class, new()
{
try
{
StringBuilder strBuilder = new StringBuilder();
strBuilder.Append("update ");
strBuilder.Append(typeof(TEntity).Name);
strBuilder.Append(" set ");
//解析需要更新的字段值
UpdateFieldBuilder updateFieldBuilder = new UpdateFieldBuilder();
strBuilder.Append(updateFieldBuilder.Translate(fields));
//解析条件
ConditionBuilder conditionBuilder = new ConditionBuilder();
strBuilder.Append(" where ");
strBuilder.Append(conditionBuilder.Translate(predicate));
//处理结果返回
TSqlAssembledResult result = new TSqlAssembledResult();
result.SqlParameters = null;
result.SqlStr = strBuilder.ToString();
return(result);
}
catch (Exception ex)
{
return(null);
throw ex;
}
}
/// <summary>
/// 更新语句组装
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="entity"></param>
/// <param name="predicate"></param>
/// <returns></returns>
public static TSqlAssembledResult Update <TEntity>(TEntity entity, Expression <Func <TEntity, bool> > predicate) where TEntity : class, new()
{
try
{
StringBuilder strBuilder = new StringBuilder();
strBuilder.Append("update ");
//
Type type = entity.GetType();
strBuilder.Append(type.Name);
strBuilder.Append(" set ");
//处理实体类属性
PropertyInfo[] properties = type.GetProperties();
int index = 0;
List <SqlParameter> sqlParameter = new List <SqlParameter>();
foreach (var property in properties)
{
object value = property.GetValue(entity, null);
if (value != null)
{
if (index != 0)
{
strBuilder.Append(",");
}
strBuilder.Append(property.Name);
strBuilder.Append("=@");
strBuilder.Append(property.Name);
sqlParameter.Add(new SqlParameter(property.Name, value));
index++;
}
}
//编译条件
ConditionBuilder conditionBuilder = new ConditionBuilder();
strBuilder.Append(" where ");
strBuilder.Append(conditionBuilder.Translate(predicate));
//处理结果返回
TSqlAssembledResult result = new TSqlAssembledResult();
result.SqlParameters = sqlParameter.ToArray();
result.SqlStr = strBuilder.ToString();
return(result);
}
catch (Exception ex)
{
return(null);
throw ex;
}
}
/// <summary>
/// 删除语句组装
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="predicate"></param>
/// <returns></returns>
public static TSqlAssembledResult Delete <TEntity>(Expression <Func <TEntity, bool> > predicate) where TEntity : class, new()
{
try
{
string tableName = typeof(TEntity).Name;
//条件编译
ConditionBuilder conditionBuilder = new ConditionBuilder();
string conditionStr = conditionBuilder.Translate(predicate);
StringBuilder strBuilder = new StringBuilder();
strBuilder.Append("delete from ");
strBuilder.Append(tableName);
strBuilder.Append(" where ");
strBuilder.Append(conditionStr);
//处理结果返回
TSqlAssembledResult result = new TSqlAssembledResult();
result.SqlParameters = null;
result.SqlStr = strBuilder.ToString();
return(result);
}
catch (Exception ex)
{
throw ex;
}
}