数据访问层的基类BaseDALSQL

using System; using System.Text; using System.Collections; using System.Data; using System.Data.Common; using System.Data.SqlClient; using System.Collections.Generic; using System.Reflection; using WHC.Pager.Entity; using Microsoft.Practices.EnterpriseLibrary.Data; using WHC.Framework.Commons; namespace WHC.Framework.ControlUtil { /// <summary> /// 数据访问层的基类 /// </summary> public abstract class BaseDALSQL<T> : AbstractBaseDAL<T>, IBaseDAL<T> where T : BaseEntity, new() { #region 构造函数 /// <summary> /// 默认构造函数 /// </summary> public BaseDALSQL() {} /// <summary> /// 指定表名以及主键,对基类进构造 /// </summary> /// <param name="tableName">表名</param> /// <param name="primaryKey">表主键</param> public BaseDALSQL(string tableName, string primaryKey) : base(tableName, primaryKey) { parameterPrefix = "@"; //数据库参数化访问的占位符 safeFieldFormat = "[{0}]"; //防止和保留字、关键字同名的字段格式，如[value] } #endregion #region 通用操作方法 /// <summary> /// 添加记录 /// </summary> /// <param name="recordField">Hashtable:键[key]为字段名;值[value]为字段对应的值</param> /// <param name="targetTable">需要操作的目标表名称</param> /// <param name="trans">事务对象,如果使用事务,传入事务对象,否则为Null不使用事务</param> public override int Insert2(Hashtable recordField, string targetTable, DbTransaction trans) { int result = -1; string fields = ""; // 字段名 string vals = ""; // 字段值 if (recordField == null || recordField.Count < 1) { return result; } SqlParameter[] param = new SqlParameter[recordField.Count]; IEnumerator eKeys = recordField.Keys.GetEnumerator(); int i = 0; while (eKeys.MoveNext()) { string field = eKeys.Current.ToString(); fields += field + ","; vals += string.Format("@{0},", field); object val = recordField[eKeys.Current.ToString()]; param[i] = new SqlParameter("@" + field, val); i++; } fields = fields.Trim(',');//除去前后的逗号 vals = vals.Trim(',');//除去前后的逗号 string sql = string.Format("INSERT INTO {0} ({1}) VALUES ({2});SELECT SCOPE_IDENTITY()", targetTable, fields, vals); Database db = CreateDatabase(); DbCommand command = db.GetSqlStringCommand(sql); foreach (string field in recordField.Keys) { object val = recordField[field]; val = val ?? DBNull.Value; if (val is DateTime) { if (Convert.ToDateTime(val) <= Convert.ToDateTime("1753-1-1")) { val = DBNull.Value; } } db.AddInParameter(command, field, TypeToDbType(val.GetType()), val); } if (trans != null) { result = Convert.ToInt32(db.ExecuteScalar(command, trans).ToString()); } else { result = Convert.ToInt32(db.ExecuteScalar(command).ToString()); } return result; } /// <summary> /// 测试数据库是否正常连接 /// </summary> public override bool TestConnection(string connectionString) { bool result = false; using (DbConnection connection = new SqlConnection(connectionString)) { connection.Open(); if (connection.State == System.Data.ConnectionState.Open) { result = true; } } return result; } #endregion #region 对象添加、修改、查询接口 /// <summary> /// 查找记录表中最旧的一条记录 /// </summary> /// <param name="trans">事务对象</param> /// <returns></returns> public override T FindFirst(DbTransaction trans = null) { string sql = string.Format("Select top 1 {0} From {1} Order by {2} ASC", selectedFields, tableName, GetSafeFileName(sortField)); Database db = CreateDatabase(); DbCommand command = db.GetSqlStringCommand(sql); T entity = GetEntity(db, command, trans); return entity; } /// <summary> /// 查找记录表中最新的一条记录 /// </summary> /// <param name="trans">事务对象</param> /// <returns></returns> public override T FindLast(DbTransaction trans = null) { string sql = string.Format("Select top 1 {0} From {1} Order by {2} DESC", selectedFields, tableName, GetSafeFileName(sortField)); Database db = CreateDatabase(); DbCommand command = db.GetSqlStringCommand(sql); T entity = GetEntity(db, command, trans); return entity; } #region 下面两个覆盖基类函数，指定具体的数据库类型 /// <summary> /// 根据条件查询数据库,并返回对象集合(用于分页数据显示) /// </summary> /// <param name="condition">查询的条件</param> /// <param name="info">分页实体</param> /// <param name="fieldToSort">排序字段</param> /// <param name="desc">是否降序</param> /// <param name="trans">事务对象</param> /// <returns>指定对象的集合</returns> public override List<T> FindWithPager(string condition, PagerInfo info, string fieldToSort, bool desc, DbTransaction trans = null) { if (HasInjectionData(condition)) { LogTextHelper.Error(string.Format("检测出SQL注入的恶意数据, {0}", condition)); throw new Exception("检测出SQL注入的恶意数据"); } PagerHelper helper = new PagerHelper(tableName, this.selectedFields, fieldToSort, info.PageSize, info.CurrenetPageIndex, desc, condition); string countSql = helper.GetPagingSql(DatabaseType.SqlServer, true); string strCount = SqlValueList(countSql, trans); info.RecordCount = Convert.ToInt32(strCount); string dataSql = helper.GetPagingSql(DatabaseType.SqlServer, false); List<T> list = GetList(dataSql, null, trans); return list; } /// <summary> /// 根据条件查询数据库,并返回DataTable集合(用于分页数据显示) /// </summary> /// <param name="condition">查询的条件</param> /// <param name="info">分页实体</param> /// <param name="fieldToSort">排序字段</param> /// <param name="desc">是否降序</param> /// <param name="trans">事务对象</param> /// <returns>指定DataTable的集合</returns> public override DataTable FindToDataTable(string condition, PagerInfo info, string fieldToSort, bool desc, DbTransaction trans = null) { if (HasInjectionData(condition)) { LogTextHelper.Error(string.Format("检测出SQL注入的恶意数据, {0}", condition)); throw new Exception("检测出SQL注入的恶意数据"); } PagerHelper helper = new PagerHelper(tableName, this.selectedFields, fieldToSort, info.PageSize, info.CurrenetPageIndex, desc, condition); string countSql = helper.GetPagingSql(DatabaseType.SqlServer, true); string strCount = SqlValueList(countSql, trans); info.RecordCount = Convert.ToInt32(strCount); string dataSql = helper.GetPagingSql(DatabaseType.SqlServer, false); return GetDataTableBySql(dataSql, trans); } #endregion /// <summary> /// 获取前面记录指定数量的记录 /// </summary> /// <param name="sql">查询语句</param> /// <param name="count">指定数量</param> /// <param name="orderBy">排序条件，例如order by id</param> /// <param name="trans">事务对象</param> /// <returns></returns> public override DataTable GetTopResult(string sql, int count, string orderBy, DbTransaction trans = null) { string resultSql = string.Format("select top {0} * from ({1} {2}) ", count, sql, orderBy); return SqlTable(resultSql, trans); } #endregion #region 特殊的操作 /// <summary> /// 兼容Oracle的字段大写的重写函数 /// </summary> /// <param name="sql">sql语句</param> /// <param name="trans">事务对象</param> /// <returns></returns> public override DataTable SqlTable(string sql, DbTransaction trans = null) { return base.SqlTable(sql.ToUpper(), trans); } /// <summary> /// 兼容Oracle的字段大写的重写函数 /// </summary> /// <param name="sql">sql语句</param> /// <param name="parameters">SQL参数集合</param> /// <param name="trans">事务对象</param> /// <returns></returns> public override DataTable SqlTable(string sql, DbParameter[] parameters, DbTransaction trans = null) { return base.SqlTable(sql.ToUpper(), parameters, trans); } /// <summary> /// 获取数据库的全部表名称 /// </summary> /// <returns></returns> public override List<string> GetTableNames() { string sql = string.Format("SELECT name FROM sysobjects WHERE (xtype = 'U') order by name"); Database db = CreateDatabase(); DbCommand command = db.GetSqlStringCommand(sql); List<string> list = new List<string>(); using (IDataReader dr = db.ExecuteReader(command)) { while (dr.Read()) { list.Add(dr[0].ToString()); } } return list; } #endregion } }

 

转载于:https://www.cnblogs.com/Jeely/p/11346539.html

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