/// <summary>
/// 根据lambda表达式条件获取实体集合
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="condition"></param>
/// <param name="orderBy"></param>
/// <param name="isDesc"></param>
/// <returns></returns>
public List <T> GetListByQueryExtensions <T>(Expression <Func <T, bool> > predicate, bool isDesc = false, string orderBy = null) where T : class
{
DynamicParameters paramsValue = null;
int paramsLength;
string where = SqlServerUtilities.GetWhereParameterized <T>(predicate, ref paramsValue, out paramsLength);
string sql = this.ToParameterizedSqlString <T>(DbOperationType.SELECT, ref paramsValue);
if (!string.IsNullOrEmpty(where))
{
sql += " WHERE " + where;
}
if (!string.IsNullOrEmpty(orderBy))
{
sql += " ORDER BY " + orderBy;
if (isDesc)
{
sql += " DESC";
}
}
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
return(connection.Query <T>(sql, paramsValue).ToList());
}
}
/// <summary>
/// 通过operationType将实体对象转换成参数化的Sql语句
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="operationType">数据库操作类型</param>
/// <param name="entity">实体对象(INSERT,UPDATE时使用)</param>
/// <param name="paramsStartIndex">参数化Sql开始的索引</param>
/// <param name="dynamicParameters">参数列表(INSERT,UPDATE,DELETE,SELECT时使用)</param>
/// <returns></returns>
private string ToParameterizedSqlString <T>(DbOperationType operationType, T entity, int paramsStartIndex, ref DynamicParameters dynamicParameters)
where T : class
{
Type t = typeof(T);
MapperPropertyInfo[] mappers = SqlServerUtilities.GetMapperPropertyInfo <T>(entity);
string[] fields = new string[0];
string[] parameterized = new string[0];
string sql = string.Empty;
switch (operationType)
{
case DbOperationType.INSERT:
parameterized = SqlServerUtilities.GetParameterized(mappers, paramsStartIndex, ref dynamicParameters, out fields);
sql = string.Format("INSERT INTO dbo.[{0}] ({1}) VALUES ({2})",
t.Name,
fields.ToString(p => "[" + p + "]"),
parameterized.ToString(null)
);
break;
case DbOperationType.UPDATE:
parameterized = SqlServerUtilities.GetParameterized(mappers, paramsStartIndex, ref dynamicParameters, out fields);
sql = string.Format("UPDATE dbo.[{0}] SET {1}",
t.Name,
fields.Combine(parameterized, (p, q) => "[" + p + "]" + "=" + q).ToString(null)
);
break;
case DbOperationType.DELETE:
sql = string.Format("DELETE FROM dbo.[{0}]", t.Name);
break;
case DbOperationType.SELECT:
fields = SqlServerUtilities.GetFields(mappers);
sql = string.Format("SELECT {0} FROM dbo.[{1}] (NOLOCK)",
fields.ToString(p => "[" + p + "]"),
t.Name
);
break;
case DbOperationType.COUNT:
sql = string.Format("SELECT COUNT(*) FROM dbo.[{0}] (NOLOCK)", t.Name);
break;
case DbOperationType.EXISTS:
sql = string.Format("SELECT 1 FROM dbo.[{0}] (NOLOCK)", t.Name);
break;
}
return(sql);
}
public T Insert <T>(T entity) where T : class
{
DynamicParameters paramsValue = null;
string sql = this.ToParameterizedSqlString <T>(DbOperationType.INSERT, entity, ref paramsValue) + ";SELECT @@IDENTITY;";
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
object ret = connection.ExecuteScalar(sql, paramsValue);
if (ret != null)
{//如果返回值不是null,设置自增键的值
SqlServerUtilities.SetIdentityValue <T>(entity, (IConvertible)ret);
}
}
return(entity);
}
/// <summary>
/// 根据lambda表达式条件获取总数量
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="condition"></param>
/// <returns></returns>
public long GetCountByQuery <T>(Expression <Func <T, bool> > condition) where T : class
{
DynamicParameters paramsValue = null;
int paramsLength;
string where = SqlServerUtilities.GetWhereParameterized <T>(condition, ref paramsValue, out paramsLength);
string sql = this.ToParameterizedSqlString <T>(DbOperationType.COUNT, ref paramsValue);
if (!string.IsNullOrEmpty(where))
{
sql += " WHERE " + where;
}
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
return(connection.Query <int>(sql, paramsValue).First());
}
}
public void Delete <T>(Expression <Func <T, bool> > condition) where T : class
{
DynamicParameters paramsValue = null;
int paramsLength;
string where = SqlServerUtilities.GetWhereParameterized <T>(condition, ref paramsValue, out paramsLength);
string sql = this.ToParameterizedSqlString <T>(DbOperationType.DELETE, ref paramsValue);
if (!string.IsNullOrEmpty(where))
{
sql += " WHERE " + where;
}
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
connection.Execute(sql, paramsValue);
}
}
public void Delete <T>(T entity) where T : class
{
DynamicParameters paramsValue = null;
List <MapperPropertyInfo> keys = SqlServerUtilities.GetPrimaryKeys <T>(entity);
string where = this.GetPrimaryKeysParameterizedSqlString(keys, out paramsValue);
string sql = this.ToParameterizedSqlString <T>(DbOperationType.DELETE, ref paramsValue);
if (!string.IsNullOrEmpty(where))
{
sql += " WHERE " + where;
}
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
connection.Execute(sql, paramsValue);
}
}
public bool IsExists <T>(Expression <Func <T, bool> > condition) where T : class
{
DynamicParameters paramsValue = null;
int paramsLength;
string where = SqlServerUtilities.GetWhereParameterized <T>(condition, ref paramsValue, out paramsLength);
string sql = this.ToParameterizedSqlString <T>(DbOperationType.EXISTS, ref paramsValue);
if (!string.IsNullOrEmpty(where))
{
sql += " WHERE " + where;
}
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
object ret = connection.ExecuteScalar(sql, paramsValue);
return(ret != null);
}
}
/// <summary>
/// 自定义IEnumerable~T的ToString方法
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source">源</param>
/// <param name="func">如果源是string类型func可以为null</param>
/// <returns></returns>
public static string ToString <T>(this IEnumerable <T> source, Func <T, string> func)
where T : class
{
SqlServerUtilities.CheckNotEmpty(source, "source");
string str1 = string.Empty;
string temp = string.Empty;
foreach (var t in source)
{
temp = (func == null ? (t as string) : func(t));
if (!string.IsNullOrEmpty(temp))
{
str1 += temp + ",";
}
}
temp = null;
return(str1.TrimEnd(','));
}
public void Delete <T>(params object[] entityIds) where T : class
{
List <MapperPropertyInfo> keys = SqlServerUtilities.GetPrimaryKeys <T>();
DynamicParameters paramsValue;
string where = this.GetPrimaryKeysParameterizedSqlString(keys, out paramsValue);
for (int i = 0; i < entityIds.Length; i++)
{
paramsValue.Add("@p" + i.ToString(), entityIds[i]);
}
string sql = this.ToParameterizedSqlString <T>(DbOperationType.DELETE, ref paramsValue);
if (!string.IsNullOrEmpty(where))
{
sql += " WHERE " + where;
}
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
connection.Execute(sql, paramsValue);
}
}
public List <T> GetPagedListExtensions <T>(int offset, int limit, out int total, bool isDesc = false, Expression <Func <T, bool> > condition = null, string orderBy = null)
where T : class
{
MapperPropertyInfo[] mappers = SqlServerUtilities.GetMapperPropertyInfo <T>(null);
//fields
string[] fields = SqlServerUtilities.GetFields(mappers);
//tableName
string tableName = "dbo.[" + typeof(T).Name + "]";
//orderBy
string order = string.IsNullOrEmpty(orderBy)
? string.Format("[{0}] ASC", mappers.First().Name)
: orderBy.IndexOf("[") > -1 ? string.Format("{0} {1}", orderBy, (isDesc ? "DESC" : "ASC")) : string.Format("[{0}] {1}", orderBy, (isDesc ? "DESC" : "ASC"));
//分页sql语句
string sql = "SELECT * FROM ( SELECT ROW_NUMBER() OVER ( ORDER BY " + order + " ) AS rownumber ,";
sql += fields.ToString(p => "[" + p + "]");
sql += " FROM " + tableName;
//where条件
string where = condition.ToMSSqlString();
if (!string.IsNullOrEmpty(where))
{
sql += " WHERE " + where;
}
sql += " ) tmp";
sql += " WHERE tmp.rownumber BETWEEN ( " + (offset + 1).ToString() + " ) AND ( " + (offset + limit).ToString() + " );";
//查询total
string sqlTotal = "SELECT COUNT(*) FROM " + tableName;
if (!string.IsNullOrEmpty(where))
{
sqlTotal += " WHERE " + where;
}
sqlTotal += ";";
using (SqlConnection connection = new SqlConnection(m_connectionString))
{
List <T> list = connection.Query <T>(sql).ToList();
total = connection.ExecuteScalar <int>(sqlTotal);
return(list);
}
}
/// <summary>
/// 将两个集合组合在一起，两个集合的长度必须相等
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <typeparam name="T2"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="list1">集合1</param>
/// <param name="list2">集合2</param>
/// <param name="func">组合的方法</param>
/// <returns></returns>
public static IList <TResult> Combine <T1, T2, TResult>(this IList <T1> list1, IList <T2> list2, Func <T1, T2, TResult> func)
where T1 : class where T2 : class where TResult : class
{
SqlServerUtilities.CheckNotEmpty(list1, "list1");
SqlServerUtilities.CheckNotEmpty(list2, "list2");
SqlServerUtilities.CheckNotEmpty(func, "func");
if (list1.Count != list2.Count)
{
throw new ArgumentException("list1与list2的数量不相等");
}
if (list1.Count == 0)
{
return(null);
}
IList <TResult> result = new List <TResult>();
for (int i = 0; i < list1.Count; i++)
{
result.Add(func(list1[i], list2[i]));
}
return(result);
}
/// <summary>
/// 获取主键的参数化Sql语句
/// </summary>
/// <param name="keys">主键列表</param>
/// <param name="parms">如果主键有值，返回参数列表</param>
/// <returns></returns>
private string GetPrimaryKeysParameterizedSqlString(List <MapperPropertyInfo> keys, out DynamicParameters parms)
{
SqlServerUtilities.CheckNotEmpty(keys, "keys");
parms = new DynamicParameters();
string sql = string.Empty;
for (int i = 0; i < keys.Count; i++)
{
if (i == (keys.Count - 1))
{
sql += string.Format("{0}=@p{1} ", "[" + keys[i].Name + "]", i);
}
else
{
sql += string.Format("{0}=@p{1} AND ", "[" + keys[i].Name + "]", i);
}
if (keys[i].Value != null)
{
parms.Add("@p" + i.ToString(), keys[i].Value);
}
}
return(sql);
}
/// <summary>
/// 批量添加(*注意：批量新增时DataTable中列的顺序一定要和数据库中列的顺序保持一致)
/// </summary>
/// <param name="tableName">批量新增的表名</param>
/// <param name="dt">数据源</param>
/// <returns></returns>
public void AddList(string tableName, DataTable dt)
{
SqlServerUtilities.AddList(m_connectionString, tableName, dt);
}