我正在尝试使用 JDBC 将数据插入 MySQL 数据库。我的问题是第二行数据从第一行末尾开始! . The picture explains better than me .这是我的代码示例。我想从第一列往下存储。
public static void main(String[] args) throws SQLException {
Connection conn = null;
Statement stmt = null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//STEP 3: Open a connection
System.out.println("Connecting to a selected database...");
conn = DriverManager.getConnection("jdbc:mysql://83.212.124.175:3306/zadmin_java?useUnicode=yes&characterEncoding=UTF-8","username", "pass.." );
System.out.println("Connected database successfully...");
//STEP 4: Execute a query
System.out.println("Inserting records into the table...");
stmt = (Statement) conn.createStatement();
for (int j=1; j<=1;j++){
Document mobilePhones = Jsoup.connect("http://www.skroutz.gr/c/40/kinhta-thlefwna.html?order_dir=asc&page=" + j).userAgent("Mozilla").get();
//get elements
Elements phoneUrls = mobilePhones.select("div[class=details] a ");
Elements phoneName = mobilePhones.select("div[class=details]");
Elements phonePrice = mobilePhones.select("p[class=price]");
Elements phoneRating = mobilePhones.select("div[class=rating-wrapper] span");
Elements phoneSpecs = mobilePhones.select("p[class=specs]");
//insert all urls to db
for(int i = 1; i<phoneUrls.size();i++){
String urls = phoneUrls.get(i).absUrl("href");
String sql = "INSERT INTO skrouzt(url) " +
"VALUES ( '"+urls+"' )";
stmt.executeUpdate(sql);
}
//insert all names to db
for(int i =1; i<phoneName.size();i++){
String names = phoneName.get(i).text();
String insert = "INSERT INTO skrouzt(name) " +
"VALUES ( '"+names+"' )";
stmt.executeUpdate(insert);
}
}
System.out.println("Inserted records into the table...");
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
conn.close();
}catch(SQLException se){
}// do nothing
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end of the main method
最佳答案
用这样的循环替换 2 个循环。
int rowCount=Math.max(phoneUrls.size(),phoneName.size());
for(int i = 1; i<rowCount;i++){
String urls = (i<phoneUrls.size()) ? "'"+phoneUrls.get(i).absUrl("href")+"'" : "NULL";
String names = (i<phoneName.size()) ? "'"+phoneName.get(i).text()+"'" : "NULL";
String sql = "INSERT INTO skrouzt(url, name) " +
"VALUES ( "+urls+","+names+" )";
stmt.executeUpdate(sql);
}
关于java - 使用JDBC向MySQL插入数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29640222/