Question

public List<JC_PHASE_MASTER_TOTAL1_MC> GetAllByCompanyCodeJobNumber()
{
    return _context.JC_PHASE_MASTER_TOTAL1_MC.FromSql(
        $"SELECT * FROM JC_PHASE_MASTER_TOTAL1_MC WHERE (Job_Number = '  123')"
    ).ToList();
}

Corresponding SQL:

SELECT *
FROM JC_PHASE_MASTER_TOTAL1_MC
WHERE
    (Job_Number = '  123')

表中的Job_Number字段是一个varchar，并使用前导空格存储任何未使用的数字。当我使用硬编码的Job_Number运行上述函数时，查询将按预期运行。但是，通过传递与参数相同的值而生成的SQL看起来像这样，并且SQL运行似乎传递数字而不是字符串：

public List<JC_PHASE_MASTER_TOTAL1_MC> GetAllByCompanyCodeJobNumber(string jobNumber)
{
    return _context.JC_PHASE_MASTER_TOTAL1_MC.FromSql(
        $"SELECT * FROM JC_PHASE_MASTER_TOTAL1_MC WHERE (Job_Number = {jobNumber})"
    ).ToList();
}

Corresponding SQL with '   123' passed to the jobNumber string parameter:

SELECT *
FROM JC_PHASE_MASTER_TOTAL1_MC
WHERE
    (Job_Number = 123)

为什么将字符串参数作为123而不是'123'传递给SQL语句？我不确定如何调整我的功能，以使参数不会作为数字传递。

每个接受的解决方案的修订代码：

public List<JC_PHASE_MASTER_TOTAL1_MC>GetAllByCompanyCodeJobNumber(string jobNumber)
{
    var jobNumberParameter = new SqlParameter("@jobNumber", SqlDbType.VarChar);
    jobNumberParameter.Value = jobNumber;

    return _context.JC_PHASE_MASTER_TOTAL1_MC.FromSql(
        $"SELECT * FROM JC_PHASE_MASTER_TOTAL1_MC WHERE (Job_Number = {jobNumberParameter})"
    ).ToList();
}

Answer 1

您是否尝试过显式设置SQL数据类型，例如：

public List<JC_PHASE_MASTER_TOTAL1_MC>GetAllByCompanyCodeJobNumber(string jobNumber)
{
    var jobNumberParameter = new SqlParameter("@jobNumber", SqlDbType.VarChar);
    jobNumberParameter.Value = jobNumber;

    return _context.JC_PHASE_MASTER_TOTAL1_MC.FromSql(
        $"SELECT * FROM JC_PHASE_MASTER_TOTAL1_MC WHERE (Job_Number = {jobNumberParameter})"
    ).ToList();
}

EF Core 2.2，将字符串参数传递给FromSql语句

1 个答案: