如何从Java到也具有时间戳格式的oracle数据库输入时间戳格式？

Question

我在SQL Oracle数据库中有此表

MESSAGES
--------
Name           Null?    Type           
-------------- -------- -------------- 
ID_MESSAGE      NOT NULL NUMBER(38)     
CONTENT          NOT NULL NVARCHAR2(500) 
TIME_STAMP NOT NULL TIMESTAMP(6)  

我正试图在此表中插入数据，但是在插入时间戳时遇到问题。

我已经用Java生成了一个时间戳并执行了以下查询：

Timestamp timeStamp = new Timestamp(System.currentTimeMillis());


String query = "INSERT INTO messages(content, time_stamp) VALUES ('"+textAreaSendMessage.getText()+"', "+timeStamp+")";

st.executeQuery(query);

我收到此错误：

Caused by: java.sql.SQLSyntaxErrorException: ORA-00917: missing comma

如何解决此问题，以便将时间戳插入数据库？

Answer 1

在定义表时使用from tkinter import * root = Tk() root.title("Validating user details") Title = Label(root,text="Welcome, please login below", fg = "blue", bg = "yellow", font = "Verdana 30 bold", bd=1, relief="solid",padx=20) Title.pack(side = TOP) usernameFrame = Frame(root) usernameFrame.pack(side = TOP) uLab = Label(usernameFrame,text="Enter username: ",fg="light green",bg="green",font = "Calibri 26 italic",bd=1, relief="solid") uLab.pack(side = LEFT) username = Entry(usernameFrame) username.pack(side = LEFT) passwordFrame = Frame(root) passwordFrame.pack(side = TOP) pnLab = Label(passwordFrame,text="Enter password: ",fg="light green",bg="green",font = "Calibri 26 italic",bd=1, relief="solid") pnLab.pack(side = LEFT,fill = X,expand = 1) password = Entry(passwordFrame,show="*") password.pack(side = LEFT) resultFrame = Frame(root) resultFrame.pack(side = TOP) Output = Label(resultFrame,text="Display Result Here",fg="#008080",bg="#00FFFF",font = "Tahoma 30 bold",bd=1, relief="solid") Output.pack(side = LEFT,fill = X,expand = 1) def LoginF(username,password): Login = False file = open("OCR PPP Python Login List_user.txt","r") data = file.read() if username+","+password in data: Output.configure(text="Successfully logged in") Login = True else: Output.configure(text="Hmm.. Try again") Login = False file.close() logButton = Button(resultFrame,text="Login",fg="#FF8C00",bg="#FF4500",font = "Ariel 28 underline",bd=1, relief="solid",command=LoginF) logButton.pack(side = LEFT) root.mainloop() 来调用捕获当前时刻的函数。每当您DEFAULT新建一行时，此功能将自动运行。这样就不需要任何Java了。

如果您确实想在Java中做类似的事情，请不要使用INSERT。该类在几年前被 java.time 类所取代。

java.time.Timestamp

使用OffsetDateTime odt = OffsetDateTime.now( ZoneOffset.UTC ) ; 占位符构建SQL字符串。不要纠缠于代码示例中看到的字符串操作。

使用?对象传递OffsetDateTime对象以填充?占位符。

PreparedStatement

Answer 2

我发现我什至不必在Java中创建时间戳，只需将CURRENT_TIMESTAMP添加到时间戳的位置到查询中应该是时间戳的位置。