/// <summary>
/// 核查表是否存在
/// </summary>
/// <param name="tableName">表名</param>
/// <returns></returns>
public bool ExistTable(string tableName)
{
var sqlHelper = new SqlHelper.SqlHelper();
string cmdText = string.Format("SELECT Count(*) FROM SYSOBJECTS WHERE ID = OBJECT_ID('{0}') AND OBJECTPROPERTY(ID, 'IsUserTable') = 1", tableName);
return(sqlHelper.ExecuteScalar(cmdText).ToInt() > 0 ? true : false);
}
/// <summary>
/// 创建表
/// </summary>
/// <param name="tableName">表名</param>
/// <returns></returns>
public bool CreateTable(string tableName)
{
var sqlHelper = new SqlHelper.SqlHelper();
string cmdText = string.Format("\r\n CREATE TABLE {0} \r\n (\r\n\t [ID] INT IDENTITY(1,1) PRIMARY KEY \r\n ) \r\n ", tableName);
return(sqlHelper.ExecuteNonQuery(cmdText) > 0 ? true : false);
}
/// <summary>
/// 核查字段是否存在
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="fieldName">字段名</param>
/// <returns></returns>
public bool ExistField(string tableName, string fieldName)
{
var sqlHelper = new SqlHelper.SqlHelper();
//查询字段
string cmdTextField = string.Format("select Count(*) from syscolumns where id=object_id('{0}') and name='{1}'", tableName, fieldName);
return(sqlHelper.ExecuteScalar(cmdTextField).ToInt() > 0 ? true : false);
}
/// <summary>
/// 添加字段
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="fieldName">字段名</param>
/// <param name="type">字段类型</param>
public bool AddField(string tableName, string fieldName, string type)
{
string cmdText = "ALTER TABLE [" + tableName + "] ADD {0}";
switch (type.ToLower())
{
case "int32":
cmdText = string.Format(cmdText, "[" + fieldName + "] [int]");
break;
case "string":
cmdText = string.Format(cmdText, string.Concat(new object[] { "[", fieldName, "] [nvarchar] (", 256, ")" }));
break;
case "datetime":
cmdText = string.Format(cmdText, "[" + fieldName + "] [datetime]");
break;
case "boolean":
cmdText = string.Format(cmdText, "[" + fieldName + "] [bit]");
break;
case "bool":
cmdText = string.Format(cmdText, "[" + fieldName + "] [bit]");
break;
case "decimal":
cmdText = string.Format(cmdText, "[" + fieldName + "] [decimal]");
break;
case "nvarchar":
cmdText = string.Format(cmdText, string.Concat(new object[] { "[", fieldName, "] [nvarchar] (", 256, ")" }));
break;
case "varchar":
cmdText = string.Format(cmdText, string.Concat(new object[] { "[", fieldName, "] [varchar] (", 256, ")" }));
break;
case "ntext":
cmdText = string.Format(cmdText, "[" + fieldName + "] [ntext]");
break;
case "text":
cmdText = string.Format(cmdText, "[" + fieldName + "] [text]");
break;
case "bit":
cmdText = string.Format(cmdText, "[" + fieldName + "] [bit]");
break;
case "money":
cmdText = string.Format(cmdText, "[" + fieldName + "] [money]");
break;
}
var sqlHelper = new SqlHelper.SqlHelper();
return(sqlHelper.ExecuteNonQuery(cmdText) == 0 ? false : true);
}
