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- using System;
- using System.Text;
- using System.Collections;
- using System.Data;
- using System.Data.Common;
- using System.Collections.Generic;
- using Microsoft.Practices.EnterpriseLibrary.Data;
- using ProjectBase.Data.BaseDAL;
- using ProjectBase.Data.Pager;
- namespace WHC.Framework.ControlUtil
- {
- /// <summary>
- /// MySql数据访问层的基类
- /// </summary>
- public abstract class BaseDALMySql<T> : AbstractBaseDAL<T>, IBaseDAL<T> where T : BaseEntity, new()
- {
- #region 构造函数
- /// <summary>
- /// 默认构造函数
- /// </summary>
- public BaseDALMySql() { }
- /// <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 BaseDALMySql(string tableName, string primaryKey)
- : base(tableName, primaryKey)
- {
- this.parameterPrefix = "?";// 数据库参数化访问的占位符
- this.safeFieldFormat = "{0}"; //防止和保留字、关键字同名的字段格式(尽量避免)
- }
- #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;
- if (recordField == null || recordField.Count < 1)
- {
- return result;
- }
- string fields = ""; // 字段名
- string vals = ""; // 字段值
- foreach (string field in recordField.Keys)
- {
- fields += string.Format("[{0}],", field);//加[]为了去除别名引起的错误
- vals += string.Format("{0}{1},", parameterPrefix, field);
- }
- 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 LAST_INSERT_ID()", 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 {0} From {1} Order by {2} ASC LIMIT 1", 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 {0} From {1} Order by {2} DESC LIMIT 1", 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)
- {
- PagerHelper helper = new PagerHelper(tableName, this.selectedFields, fieldToSort,
- info.PageSize, info.CurrenetPageIndex, desc, condition);
- string countSql = helper.GetPagingSql(DatabaseType.MySql, true);
- string strCount = SqlValueList(countSql, trans);
- info.RecordCount = Convert.ToInt32(strCount);
- string dataSql = helper.GetPagingSql(DatabaseType.MySql, 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)
- {
- PagerHelper helper = new PagerHelper(tableName, this.selectedFields, fieldToSort,
- info.PageSize, info.CurrenetPageIndex, desc, condition);
- string countSql = helper.GetPagingSql(DatabaseType.MySql, true);
- string strCount = SqlValueList(countSql, trans);
- info.RecordCount = Convert.ToInt32(strCount);
- string dataSql = helper.GetPagingSql(DatabaseType.MySql, false);
- return GetDataTableBySql(dataSql, trans);
- }
- /// <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 * from ({1} {2}) LIMIT {0} ", count, sql, orderBy);
- return SqlTable(resultSql, trans);
- }
- #endregion
- #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)
- {
- //由于Sqlite字段查询不区分大小写,因此要返回大写字段,不能通过改变Sql大写方式
- //通过代码改变列的名称为大写即可
- DataTable dt = base.SqlTable(sql, trans);
- foreach (DataColumn col in dt.Columns)
- {
- col.ColumnName = col.ColumnName.ToUpper();
- }
- return dt;
- }
- /// <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)
- {
- //由于Sqlite字段查询不区分大小写,因此要返回大写字段,不能通过改变Sql大写方式
- //通过代码改变列的名称为大写即可
- DataTable dt = base.SqlTable(sql, parameters, trans);
- foreach (DataColumn col in dt.Columns)
- {
- col.ColumnName = col.ColumnName.ToUpper();
- }
- return dt;
- }
- /// <summary>
- /// 获取数据库的全部表名称
- /// </summary>
- /// <returns></returns>
- public override List<string> GetTableNames()
- {
- string sql = string.Format("show tables;");
- 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
- }
- }
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