我从用户那里获得数据库文件的名称,我想检查该文件是否已经存在。如果确实存在,我想向用户显示错误消息,但是我不知道如何检查文件是否存在。
public static void databaseConnect(String dbName) throws Exception
{
if (/*same name exists*/) // How do I check this?
{
System.out.print("This database name already exists");
}
else
{
Class.forName("SQLite.JDBCDriver").newInstance();
conn = DriverManager.getConnection("jdbc:sqlite:/"+ dbName);
stat = conn.createStatement();
}
}
最佳答案
public static void databaseConnect(String dbName) throws Exception {
File file = new File (dbName);
if(file.exists()) //here's how to check
{
System.out.print("This database name already exists");
}
else{
Class.forName("SQLite.JDBCDriver").newInstance();
conn = DriverManager.getConnection("jdbc:sqlite:/"+ dbName);
stat = conn.createStatement();
}