import java.sql.*;
public class ArticleTree {
public static void main(String[] args) {
new ArticleTree().show();
}
public void show() {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager
.getConnection("jdbc:mysql://localhost/bbs?user=root&password=root");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from article where pid = 0");
while(rs.next()){
System.out.println(rs.getString("cont"));
tree(conn, rs.getInt("id"), 1);
}
} catch(ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if(rs != null) {
rs.close();
rs = null;
}
if(stmt != null) {
stmt.close();
stmt = null;
}
if(conn != null) {
conn.close();
conn = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
private void tree(Connection conn, int id, int level) {
Statement stmt = null;
ResultSet rs = null;
StringBuffer strPre = new StringBuffer("");
for(int i=0; i<level; i++) {
strPre.append(" ");
}
try {
stmt = conn.createStatement();
String sql = "select * from article where pid = " + id;
rs = stmt.executeQuery(sql);
while(rs.next()) {
System.out.println(strPre + rs.getString("cont"));
if(rs.getInt("isleaf") != 0)
tree(conn, rs.getInt("id"), level + 1);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if(rs != null) {
rs.close();
rs = null;
}
if(stmt != null) {
stmt.close();
stmt = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}