查詢資料庫所有表並統計數量
阿新 • • 發佈:2019-01-30
package com.dbexp.text; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import com.mysql.jdbc.Connection; import com.mysql.jdbc.DatabaseMetaData; public class DateExp { Connection conn = null; public Connection getcConnection(){ try { Class.forName("com.mysql.jdbc.Driver"); conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/vocs", "root", "123456"); return conn; } catch (ClassNotFoundException e) { System.out.println("com.mysql.jdbc.Driver不存在!"); } catch (SQLException e) { System.out.println("資料庫連結失敗!"); } return null; } public void close(){ try { conn.close(); } catch (SQLException e) { System.out.println("資料庫連結關閉失敗!"); } } public List<Object> getAllTable(){ getcConnection(); //list集合中將會包含查詢資料庫的所有表名 List<Object> list = new ArrayList<Object>(); try { DatabaseMetaData dm = (DatabaseMetaData) conn.getMetaData(); ResultSet rs = dm.getTables("", "", null, null); while(rs.next()){ list.add(rs.getString("TABLE_NAME")); } close(); return list; } catch (SQLException e) { System.out.println("獲取資料表失敗!"); return null; } } public static void main(String[] args) { DateExp de = new DateExp(); List<Object> list = de.getAllTable(); int count = 0; for (int i = 0; i < list.size(); i++) { System.out.println(list.get(i)); if(i == list.size()-1){ count = i + 1; } } System.out.println("共 "+count+"張表"); } }