Question

我有这个功能性查询，我只使用虚构表名来解决安全问题：

SELECT 
h.CENID,
 h.BMHFMC, 
 h.BMHDONEMIDASSTEP1, 
 h.BMHDONEMIDASSTEP2,
 h.LMIID, 
 h.BMHHOLD,
 h.BMHBATCHMIDAS,
 h.BMHFMCVALUEDATE AS HeaderValueDate, 
 h.SUNID, 
 h.BRAID,
 d.BMHID, 
 d.BMDRUBRIQUE,
 d.BMDCLIENT,
 d.BMDSEQUENCE,
 d.BMDDATE, 
 d.BMDDEVISE, 
 d.BMDMONTANT,
 d.BMDTYPE, 
 d.BMDNOTE, 
 d.BMDENTRYNBRE,
 v.DEVDECIMAL ,
 NVL(t.TYPVERIFCOMPTEMIDAS, 0) AS TYPVERIFCOMPTEMIDAS 
 FROM dbo.TableOne h 
 INNER JOIN dbo.Tabletwoo d
 ON h.BMHID = d.BMHID 
 INNER JOIN dbo.tableThree v
 ON d.BMDDEVISE = v.DEVID 
 LEFT JOIN dbo.TableFour t 
 ON  t.TYPID=h.BMHFMC  
 WHERE d.BMDMONTANT != 0 
 AND h.BMHDONEMIDASSTEP1 = 0
 AND h.BMHDONEMIDASSTEP2 = 0 
 AND h.LMIID = 0 
 AND h.BMHHOLD = 0

我创建了一个类来绑定每个字段

 public class Batch :BaseRepository ,IList<Batch>
    {
        public Batch()
        {
        }

        private string cendid;
        private string bmhfmc;
        private double bmhdonemidasstep1;
        private double bmhdonemidasstep2;
        private double lmiid;
        private double bmhhold;
        private double bmhbatchmidas;
        private DateTime headervaluedateordinal;
        private double sunid; // 
        private string bradid; //
        private double bmhid;
        private string bmdrubirique; //
        private string bmdclient;
        private string bmdsequence;
        private DateTime bmddate;
        private string bmddevise;
        private double bmdmontant;
        private string bmdtype;
        private string bmdnote;
        private string bmdentrynbre; //
        private double devdecimalordinal;
        private double typverifcomptemidasordinal;

        public Batch(string cendid, string bmhfmc, double bmhdonemidasstep1, double bmhdonemidasstep2, double lmiid, double bmhhold, double bmhbatchmidas, DateTime headervaluedateordinal, double sunid, string bradid, double bmhid, string bmdrubirique, string bmdclient, string bmdsequence, DateTime bmddate, string bmddevise, double bmdmontant, string bmdtype, string bmdnote, string bmdentrynbre, double devdecimalordinal, double typverifcomptemidasordinal)
        {
            this.cendid = cendid;
            this.bmhfmc = bmhfmc;
            this.bmhdonemidasstep1 = bmhdonemidasstep1;
            this.bmhdonemidasstep2 = bmhdonemidasstep2;
            this.lmiid = lmiid;
            this.bmhhold = bmhhold;
            this.bmhbatchmidas = bmhbatchmidas;
            this.headervaluedateordinal = headervaluedateordinal;
            this.sunid = sunid;
            this.bradid = bradid;
            this.bmhid = bmhid;
            this.bmdrubirique = bmdrubirique;
            this.bmdclient = bmdclient;
            this.bmdsequence = bmdsequence;
            this.bmddate = bmddate;
            this.bmddevise = bmddevise;
            this.bmdmontant = bmdmontant;
            this.bmdtype = bmdtype;
            this.bmdnote = bmdnote;
            this.bmdentrynbre = bmdentrynbre;
            this.devdecimalordinal = devdecimalordinal;
            this.typverifcomptemidasordinal = typverifcomptemidasordinal;
        }

        public string Cendid
        {
            get { return cendid; }
            set { cendid = value; }
        }

        public string Bmhfmc
        {
            get { return bmhfmc; }
            set { bmhfmc = value; }
        }

        public double Bmhdonemidasstep1
        {
            get { return bmhdonemidasstep1; }
            set { bmhdonemidasstep1 = value; }
        }

        public double Bmhdonemidasstep2
        {
            get { return bmhdonemidasstep2; }
            set { bmhdonemidasstep2 = value; }
        }

        public double Lmiid
        {
            get { return lmiid; }
            set { lmiid = value; }
        }

        public double Bmhhold
        {
            get { return bmhhold; }
            set { bmhhold = value; }
        }

        public double Bmhbatchmidas
        {
            get { return bmhbatchmidas; }
            set { bmhbatchmidas = value; }
        }

        public DateTime Headervaluedateordinal
        {
            get { return headervaluedateordinal; }
            set { headervaluedateordinal = value; }
        }

        public double Sunid
        {
            get { return sunid; }
            set { sunid = value; }
        }

        public string Bradid
        {
            get { return bradid; }
            set { bradid = value; }
        }

        public double Bmhid
        {
            get { return bmhid; }
            set { bmhid = value; }
        }

        public string Bmdrubirique
        {
            get { return bmdrubirique; }
            set { bmdrubirique = value; }
        }

        public string Bmdclient
        {
            get { return bmdclient; }
            set { bmdclient = value; }
        }

        public string Bmdsequence
        {
            get { return bmdsequence; }
            set { bmdsequence = value; }
        }

        public DateTime Bmddate
        {
            get { return bmddate; }
            set { bmddate = value; }
        }

        public string Bmddevise
        {
            get { return bmddevise; }
            set { bmddevise = value; }
        }

        public double Bmdmontant
        {
            get { return bmdmontant; }
            set { bmdmontant = value; }
        }

        public string Bmdtype
        {
            get { return bmdtype; }
            set { bmdtype = value; }
        }

        public string Bmdnote
        {
            get { return bmdnote; }
            set { bmdnote = value; }
        }

        public string Bmdentrynbre
        {
            get { return bmdentrynbre; }
            set { bmdentrynbre = value; }
        }

        public double Devdecimalordinal
        {
            get { return devdecimalordinal; }
            set { devdecimalordinal = value; }
        }

        public double Typverifcomptemidasordinal
        {
            get { return typverifcomptemidasordinal; }
            set { typverifcomptemidasordinal = value; }
        }

现在，当我使用dapper

将查询执行到列表中时

Connection conn = new Connection();
 OracleConnection connection = conn.GetDBConnection();
  myList= connection.Query<Batch>(querySql).ToList();

现在，在调试时，所有字段都会返回预期的值。但是，我注意到以下null中的myList字段不是空的，而是null，但问题是它们不是＆{ ＃39; t数据库中的null

Bmdrubirique , Sunid, Bmdentrynbre, Bradid ,Cenid

在oracle数据库中，这些字段如下所示：

CENID is VARCHAR2(3 BYTE)` 
Bmhid is VARCHAR2(3 BYTE) 
Sunid is NUMBER(38,0)
Bradid is VARCHAR2(3 BYTE)

我不明白，哪里出错了？为什么其他字段正确加载，而那些字段返回null值？

Answer 1

我的默认假设是实际代码中存在拼写错误，构造函数将字段中的值赋给自身。但是，坦率地说：既然你有一个public Batch() {}构造函数，我不确定第二个的好处是什么 - 它只会增加错误的风险。与字段和手动属性类似。

所以，如果这是我，你现在所在的地方（简化为两个属性）：

public class Batch
{
    private string cendid;
    private string bmhfmc;
    public Batch() {}
    public Batch(string cendid, string bmhfmc)
    {
        this.cendid = cendid;
        this.bmhfmc = bmhfmc;
    }

    public string Cendid
    {
        get { return cendid; }
        set { cendid = value; }
    }

    public string Bmhfmc
    {
        get { return bmhfmc; }
        set { bmhfmc = value; }
    }
}

我真的只是：

public class Batch
{
    public string Cendid {get;set;}
    public string Bmhfmc {get;set;}
}

所有其余的代码只是造成编码错误的机会。

现在：Cendid为null的原因是：列是CENID - 只有一个d。这意味着即使使用自定义构造函数，dapper也是如此，因为它不是构造函数和列之间的完美匹配。与其他字段类似，例如BRAID vs BRADID。

接下来要做的就是解决错别字。

为什么Query使用dapper将一些空值返回给我的列表对象

1 个答案: