package test;

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.ResultSet;
import java.sql.Statement;

//這是一個工具類實現與數據庫的連接
public class JDBConnection {
  String sd = "sun.jdbc.odbc.JdbcOdbcDriver";
 String sc = "jdbc:odbc:db_Client";
 ResultSet rs = null;
 Connection conect = null;
 public JDBConnection() {
     try {
     Class.forName(sd);
   }
   catch (java.lang.ClassNotFoundException e) {
     System.err.println(e.getMessage());
   }
 }

 public ResultSet executeQuery(String sql) {
   try {
     conect = DriverManager.getConnection(sc);
     Statement stmt = conect.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
                                             ResultSet.CONCUR_READ_ONLY);
     rs = stmt.executeQuery(sql);
   }
   catch (SQLException ex) {
     System.err.println(ex.getMessage());
   }
   return rs;
 }

 public int executeUpdate(String sql) {
   int result = 0;
   try {
     conect = DriverManager.getConnection(sc);
     Statement stmt = conect.createStatement();
     result = stmt.executeUpdate(sql);
   }
   catch (SQLException er) {
     System.err.println(er.getMessage());
   }
   return result;
 }

 public void close() {
   try {
     if (conect != null) {
       conect.close();
     }
   }
   catch (Exception e) {
     System.out.println(e);
   }
 }


  //設置提交
  public void setAutoCommit(boolean flag) {
    try {
      conect.setAutoCommit(flag);
    }
    catch (Exception exception) {
      System.out.println("Exception in set autoCommit :" + exception.getMessage());
    }
  }

  //執行提交
  public void commit() {
    try {
      conect.commit();
    }
    catch (Exception exception) {
      System.out.println("Exception in commit :" + exception.getMessage());
    }
  }

  //執行回滾
  public void rollback() {
    try {
      conect.rollback();
    }
    catch (Exception exception) {
      System.out.println("Exception in rollback :" + exception.getMessage());
    }
  }

  //將sql語句中的？號轉為相應的參數 ，其中參數為字符串型的
  public String editSqlCode(String sql, String str) {

    try {
      // 截取從0到第一個問號的字符串加參數str，然后在加上第一問號以后的字符串
      sql = sql.substring(0, sql.indexOf("?")) + str +
          sql.substring(sql.indexOf("?") + 1);
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    return sql;
  }

  //將sql語句中的？號轉為相應的參數 ，其中參數為長整型的
  public String editSqlCode(String sql, Integer str) {

    try {
      sql = sql.substring(0, sql.indexOf("?")) + str +
          sql.substring(sql.indexOf("?") + 1);

    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    return sql;
  }

  //將sql語句中的？號轉為相應的參數 ，其中參數為整型的
  public String editSqlCode(String sql, int str) { //提取SQL語句，并把(int str)傳出來的值來代替？

    try {
      sql = sql.substring(0, sql.indexOf("?")) + str +
          sql.substring(sql.indexOf("?") + 1);
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    return sql;
  }
  //將sql語句中的？號轉為相應的參數 ，其中參數為整型的
  public String editSqlCode(String sql, Float str) { //提取SQL語句，并把(Float str)傳出來的值來代替？

    try {
      sql = sql.substring(0, sql.indexOf("?")) + str +
          sql.substring(sql.indexOf("?") + 1);
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    return sql;
  }


}