Postgres：如何修复此创建查询？

如何解决Postgres：如何修复此创建查询？

我正在学习 Postgres 并尝试创建命令。但它给出了我无法理解的错误。 命令是：

//create a class to represent the user; Dapper will query the database and populate this class with information automatically
public class PosUser{
    public string FullName{get;set;}
    public string Designation{get;set;}
    public string IDPicture{get;set;}
}

private async void btnLogin_Click(object sender,EventArgs e)
{
    
    string conn = ConfigurationManager.ConnectionStrings["SystemDatabase"].ConnectionString;

    PosUser r;

    using(sqlconn = new sqlConnection(conn)){

        var query = "Select designation,fullname from UserAccount where Username = @Username and Password = @Password";

        var r = await conn.QuerySingleOrDefaultAsync<PosUser>(
            query,new {
                Username = txtUsername.Text,Password = txtPassword.Text.GetHashcode() //at least make some effort to obscure passwords in the db!
            }
        );
    }

    if(r == default){
        MessageBox.Show("User not Exist!","My POS",MessageBoxButtons.RetryCancel,MessageBoxIcon.Warning);
        return;
    }

    FrmWait waitfrm = new FrmWait();
    waitfrm.Show();

    if(r.Designation == "Cashier")
    {
        FrmPOS frm = new FrmPOS(); //if this does heavy io,move the io to a method you can call async
        await frm.DoIoInHereAsync(); //like this,or in an async form load
        frm.lblCashierName.Text = r.FullName;
        frm.Show();
    }
    else if (r.Designation == "Admin")
    {
        Form1 frm = new Form1(); //do not do io in here
        await frm.DoIoInHereAsync();
        frm.lblFullname.Text = r.FullName;
        frm.lblPosition.Text = r.Designation;
        byte[] imgBytes = Convert.FromBase64String(r.IDPicture);
        using (MemoryStream ms = new MemoryStream(imgBytes))
        {
            frm.pbuser.Image = Image.FromStream(ms);
        }
        FrmStockIn fsi = new FrmStockIn(); //do not do io in here
        await fsi.DoIoInHereAsync();
        fsi.txtStockinby.Text = r.FullName;
    }

    
    waitfrm.Close();

}

和错误：

CREATE TABLE Package (
    id smallint NOT NULL primary key,package_name varchar ( 45 ) not null,updated_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,count integer(2) default null,pkg_desc varchar ( 45 ) not null,bucket_name varchar ( 45 ) not null,active bit(1),status INT(2) default null,Metadata JSONB,path varchar ( 45 ) default null,created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,run_status INT(5) 
)

解决方法

您使用 integer(2) 和 INT(2) 创建列。您不得添加该号码。整数是固定大小。你也应该决定一种方式来写它 试试这个：

CREATE TABLE Package (
    id smallint NOT NULL primary key,package_name varchar ( 45 ) not null,updated_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,count INT default null,pkg_desc varchar ( 45 ) not null,bucket_name varchar ( 45 ) not null,active bit(1),status INT default null,metadata JSONB,path varchar ( 45 ) default null,created_at timestamp NULL DEFAULT CURRENT_TIMESTAMP,run_status INT
)

,

integer 和 int 类型不接受参数。 你不能把它写成 integer(2)，这会导致语法错误。

create table Package (
  id smallint not null primary key,package_name varchar(45) not null,updated_at timestamp null default current_timestamp,count integer default null,pkg_desc varchar(45) not null,bucket_name varchar(45) not null,status int default null,metadata jsonb,path varchar(45) default null,created_at timestamp null default current_timestamp,run_status int
)

官方文档应该有帮助： https://www.postgresql.org/docs/13/datatype.html