[英]Why I am receiving this sql error?
我開始了我的Java代碼在NetBeans中,我想在我插入一些數據numbersdb
位於數據庫表firstdb
。 我在運行程序時遇到問題。
我的代碼是這樣的:
public static void main(String [] arg){
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Driver loaded!");
Connection dbc = DriverManager.getConnection("jdbc:mysql://localhost:3306/firstdb", "root","root");
System.out.println("Connection to database succeded!");
boolean evening = false;
int n100 = 1;
int n10 = 2;
int n1 = 3;
int wn = 123;
int month = 0;
int day = 0;
int year = 0;
java.sql.Date date_released = new java.sql.Date(Calendar.getInstance().getTime().getTime());
String query = "insert into numbersdb (hundreds_place, tens_place, ones_place, whole_number, evening, date_released, day, month, year) "+
" VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)";
PreparedStatement preparedStatement = dbc.prepareStatement(query);
preparedStatement.setInt(1, n100);
preparedStatement.setInt(2, n10);
preparedStatement.setInt(3, n1);
preparedStatement.setInt(4, wn);
preparedStatement.setBoolean(5, evening);
preparedStatement.setDate(6, date_released);
preparedStatement.setInt(7, day);
preparedStatement.setInt(8, month);
preparedStatement.setInt(9, year);
preparedStatement.execute(query);
System.out.println("Query executed!!!");
} catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
} catch (ClassNotFoundException e) {
throw new RuntimeException("Cannot find the driver in the classpath!", e);
}
}
我在phpmyadmin中使用以下sql代碼創建了數據庫:
create table numbersdb (
hundreds_place int unsigned not null,
tens_place int unsigned not null,
ones_place int unsigned not null,
whole_number int unsigned not null,
evening boolean not null,
date_released date not null,
day int unsigned not null,
month int unsigned not null,
year int unsigned not null,
primary key (date_released)
);
我的程序的輸出是這樣的:
驅動程序已加載! 與數據庫的連接成功! SQLException:您的SQL語法有錯誤; 在第1行的SQLState:42000中,檢查與您的MySQL服務器版本相對應的手冊,以在'?,?,?,?,?,?,?,?,?,?)'附近使用正確的語法
VendorError:1064
為什么我會收到這種例外情況?
preparedStatement.execute(query);
該行使用從Statement
繼承的.execute(String)
。 所述方法僅執行給定查詢,該查詢現在包含?
的。
刪除參數以使用正確的方法,它將起作用。
preparedStatement.execute();
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