新增修改删除等方法

//创建datatable
DataTable dt = new DataTable("个人简历");
            dt.Columns.Add("id", typeof(int));
            dt.Columns.Add("name", typeof(string));
            dt.Columns.Add("sex", typeof(int));
            dt.Columns.Add("address", typeof(string));
            dt.Columns.Add("aihao", typeof(string));
            dt.Columns.Add("photo", typeof(string));
            dt.Rows.Add(new object[] { 1, "张三", 1, "东大街6号", "看书", "" });
            dt.Rows.Add(new object[] { 1, "王五", 0, "西大街2号", "上网,游戏", "" });
            dt.Rows.Add(new object[] { 1, "李四", 1, "南大街3号", "上网,逛街", "" });
            dt.Rows.Add(new object[] { 1, "钱八", 0, "北大街5号", "上网,逛街,看书,游戏", "" });
            dt.Rows.Add(new object[] { 1, "赵九", 1, "中大街1号", "看书,逛街,游戏", "" });

//查询(getDatas)
public static DataSet getDatas(string tableName,string strCondition)
{
    string sql = "select * from "+tableName+" where 1=1 "+strCondition;
    DB.DataHelper dtHelper = new DB.DataHelper();
        return dtHelper.ExecuteSql(sql);
}

//获取(getItems)
public static DataSet getItems(string code,string describe,string tableName,string strCondition)
{
    string sql = "select distinct "+code+" as code ,"+describe+" as describe  from "+tableName+" where 1=1 "+strCondition;
    DB.DataHelper dtHelper = new DB.DataHelper();
        return dtHelper.ExecuteSql(sql);
}

//新增多行(insertDatas)
public static int insertDatas(DataTable dt)
{
        if(dt ==null || dt.Rows.Count<=0)
        return 0;
        string tableName = dt.TableName;
        ArrayList sqlList = new ArrayList();
        string sql ="";
        string sql1="";
        string sql2="";
        foreach(DataRow row in dt.Rows) ////遍历行拼sql语句
        {
            sql = "insert into "+tableName+"(";
            sql1 ="";
            sql2 ="";
            for(int i =0;i<dt.Columns.Count;i++)
            {
                sql1=sql1+dt.Columns[i].ColumnName.ToString()+",";
                sql2=sql2+"‘"+row[i].ToString()+"‘,";
            }
            sql = sql +sql1.Substring(0, sql1.Length - 1)+") values("+sql2.Substring(0, sql2.Length - 1)+ ")";
            sqlList.Add(sql);
        }
        DB.DataHelper dtHelper = new DB.DataHelper();
        dtHelper.ExecuteSqlTran(sqlList);
        return 1;
}

//修改多行(updateDatas)
public static int updateDatas(DataTable dt)
{
        if(dt ==null || dt.Rows.Count<=0)
        return 0;
        string tableName = dt.TableName;
        string pk = dt.Columns[0].ColumnName.ToString(); //获取第一列名（主键列）
    string pkValue = row[0].ToString(); //获取第一行的（主键值）
        ArrayList sqlList = new ArrayList();
        string sql ="";
        string sql1="";
        foreach (DataRow row in dt.Rows) //遍历行
        {
            sql = "update " + tableName + " set ";
            for (int i = 1; i < dt.Columns.Count; i++) //从1开始，因为第一列为主键值
            {
                sql1 = sql1 + dt.Columns[i].ColumnName + "= ‘" + row[i].ToString() + "‘,";//列名+列值
            }
            sql = sql + sql1.Substring(0, sql1.Length - 1) + " where " + pk + " = ‘" + pkValue + "‘";
            sqlList.Add(sql);
        }
        DB.DataHelper dtHelper = new DB.DataHelper();
        dtHelper.ExecuteSqlTran(sqlList);
        return 1;
}

//删除单条，返回影响条数(deleteData)
public static int deleteData(string tableName,string strCondition)
{
    string sql = "delete from "+tableName+" where 1=1 "+strCondition;
    DB.DataHelper dtHelper = new DB.DataHelper();
        return dtHelper.ExecuteSql(sql);
}

//删除多条(deleteDatas)
public static int deleteDatas(DataTable dt)
{
        if(dt == null||dt.Rows.Count<=0)
            return 0;
        string tableName = dt.TableName;
        ArrayList sqlList = new ArrayList();
        string sql = "";
        foreach(DataRow row in dt.Rows)
        {
            string pk = dt.Columns[0].ColumnName.ToString(); //获取第一列名（主键列）
      string pkValue = row[0].ToString(); //获取第一行的（主键值）
            sql="delete from "+tableName+" where "+pk+" = ‘"+pkValue+"‘";
            sqlList.Add(sql);
        }
        DB.DataHelper dtHelper = new DB.DataHelper();
        dtHelper.ExecuteSqlTran(sqlList);
        return 1;
}

//多步操作使用数组接受参数(multiStep)
public static int multilStep(DataTable dt)
{
    string[] arr = new string[dt.Columns.Count];
    foreach(DataRow row in dt.Rows)
    {
        for (int i = 0; i < dt.Columns.Count; i++)
            {
                arr[i]=row[i].ToString();
            }
    }
    //参数1arr[0]
    //参数2arr[1]
    //参数3arr[2]
    ...
    string sql1="";
    string sql2="";
    string sql3="";
    ArrayList sqlList = new ArrayList();
    sqlList.Add(sql1);
    sqlList.Add(sql2);
    sqlList.Add(sql2);3.
    DB.DataHelper dtHelper = new DB.DataHelper();
    dtHelper.ExecuteSqlTran(sqlList);
    return 1;
}