错误[22P02]错误：整数的无效输入语法：“”； [英] ERROR [22P02] ERROR: invalid input syntax for integer: "";

问题描述

从未见过这样的错误：

错误[22P02]错误：整数的无效输入语法：；执行查询时出错

ERROR [22P02] ERROR: invalid input syntax for integer: ""; Error while executing the query

创建表：

    Public Function PrimkCreate(ByVal myPrimkTable As String, ByVal nCon As OdbcConnection) As Integer
    Dim ans As Integer
    Dim cCommand As OdbcCommand = New OdbcCommand("CREATE TABLE IF NOT EXISTS " + myPrimkTable + "(" & _
            "prm_id int NOT NULL, " & _
            "pkni text, " & _
            "pdatum text, " & _
            "pdatumnaplate text, " & _
            "pdanaodgode int, " & _
            "puldok text, " & _
            "puldokbroj text, " & _
            "pdatumk text, " & _
            "pvrijemek text, " & _
            "pdobid int, " & _
            "pdoboib text, " & _
            "pnabc double precision, " & _
            "purab double precision, " & _
            "ppdv double precision, " & _
            "ppnak double precision, " & _
            "pprodc double precision, " & _
            "pvrstaprimke int, " & _
            "pzapisniktekst text, " & _
            "prez text, " & _
            "CONSTRAINT " & myPrimkTable & "_pkey PRIMARY KEY(prm_id))", nCon)

    ans = cCommand.ExecuteNonQuery()
    cCommand.Dispose()
    Return ans
End Function

更新代码：

    Public Function update_LPrimk(ByRef primk As Integer, ByVal mCon As OdbcConnection) As Integer

    Dim retval As Integer
    Dim uCmd As OdbcCommand = New OdbcCommand("UPDATE " & myPrimkTable & " SET " & _
                "prm_id=" & primk & ", " & _
                "pkni='" & prm.pKni & "', " & _
                "pdatum='" & prm.pDatum & "', " & _
                "pdatumnaplate='" & prm.pDatumNaplate & "', " & _
                "pdanaodgode=" & prm.pDanaodgode & ", " & _
                "puldok='" & prm.pUlDok & "', " & _
                "puldokbroj='" & prm.pUlDokBroj & "', " & _
                "pdatumk='" & prm.pDatumk & "', " & _
                "pvrijemek='" & prm.pVrijemek & "', " & _
                "pdobid='" & prm.pDobID & "', " & _
                "pdoboib='" & prm.pDobOib & "', " & _
                "pnabc='" & Replace(prm.pNabc.ToString, ",", ".") & "', " & _
                "purab='" & Replace(prm.pURab.ToString, ",", ".") & "', " & _
                "ppdv='" & Replace(prm.pPdv.ToString, ",", ".") & "', " & _
                "ppnak='" & Replace(prm.pPnak.ToString, ",", ".") & "', " & _
                "pprodc='" & Replace(prm.pProdc.ToString, ",", ".") & "', " & _
                "pvrstaprimke=" & prm.pVrstaPrimke & ", " & _
                "pzapisniktekst='" & prm.pZapisnikTekst & "', " & _
                "prez='" & prm.pRez & "' " & _
                "WHERE prm_id=" + primk.ToString, mCon)

    retval = uCmd.ExecuteNonQuery()
    uCmd.Dispose()
    Return retval
End Function

查询看起来完全像这样：

Query looks exactly like this:

UPDATE primke SET prm_id=1, pkni='U', pdatum='07.01.2013', pdatumnaplate='10.01.2013',
pdanaodgode=3, puldok='ghkzug gugug', puldokbroj='jkhk', pdatumk='', pvrijemek='', 
pdobid='', pdoboib='', pnabc='0', purab='0', ppdv='0', ppnak='0', pprodc='0', 
pvrstaprimke=0, pzapisniktekst='', prez='' WHERE prm_id=1

我有很多表在其中运行类似的命令，但从未见过这样的错误。

可能是什么问题？

I have many tables where I run similar commands but have never seen such an error.
What might be the problem?

推荐答案

我建议阅读手册中的常量 。这是一篇简短而有益的文章。

错误消息的原因是''是一个空字符串，具有没有像 integer 这样的数字类型的表示形式。

I would advice to read the chapter Constants in the manual. It's a brief and informative read.
The cause for the error message is that '' is an empty string that has no representation in a numeric type like integer.

@a_horse_with_no_name：确切地说， '0'是PostgreSQL的 string 常量，可以将其强制转换为 integer 到 text ，只有 text 是字符串常量的默认值。考虑这个演示：

@a_horse_with_no_name: To be precise, '0' is a string constant to PostgreSQL that can be cast to integer just as well as it can be cast to text, only text is the default for string constants. Consider this demo:

CREATE TEMP TABLE t (i int);
INSERT INTO t VALUES (1);
INSERT INTO t VALUES ('2');        -- single row inserts to make sure ..
INSERT INTO t VALUES ('3'::int);   -- .. type is not coerced to type
INSERT INTO t VALUES (4::bigint);  -- .. of first row by VALUES expression.
INSERT INTO t VALUES (5::numeric);
INSERT INTO t VALUES (6);

UPDATE t SET i = '0' WHERE i = '6';
SELECT * FROM t;

SQL提琴。

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