EF Core 2.2，将字符串参数传递给 FromSql 语句

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 并且存储有任何未使用数字的前导空格。当我使用 Job_Number 硬编码运行上述函数时，查询会按预期运行。但是，通过将相同的值作为参数传递所产生的 SQL 看起来像这样，并且 SQL 运行似乎传递了一个数字而不是一个字符串：

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)

为什么传入SQL语句的字符串参数是123而不是'123'？我不确定如何调整我的函数以使参数不作为数字传递。

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();
}