總綱四步
一:申明 驅動 連接方式 用戶名 密碼
二:加載驅動
三:獲得連接
四:關閉資源
-----------------------------------------------------JDBC連接Oracle數據庫代碼------------------------------------------------
package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBHelper {
//測試是否連接上數據庫,測試完請刪掉該代碼
//public static void main(String[] args) {
// System.out.println(getcon());
//}
//1.聲明驅動和連接
//聲明數據庫驅動
private static final String className="oracle.jdbc.driver.OracleDriver";(oracle.jdbc.driver.OracleDriver可以打一 個OracleDriver敲快捷鍵在引用條碼中可以找到)
//聲明數據庫連接
private static final String url="jdbc:oracle:thin:@127.0.0.1:1521:orcl";
//聲明用戶名和密碼
private static final String password="TIGER";
//2.加載數據庫驅動(只需加載一次)
static {
try {
//加載驅動
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//3.獲得連接的方法
public static Connection getcon() {Connection con=null;
try {
//從驅動管理中獲得一個連接
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return con;
}
//4.關閉連接
public static void close(Connection con,PreparedStatement ps,ResultSet rs) {
try {
//關閉con
con.close();
}
//關閉ps
ps.close();
}
//關閉rs
rs.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(Connection con,PreparedStatement ps) {
close(con, ps,null);
}
public static void close(Connection con) {
close(con,null,null);
}
}
----------------------------------------------------JDBC連接SQLServer數據庫代碼---------------------------------------------
package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.microsoft.sqlserver.jdbc.SQLServerDriver;
public class DBHelper {
//測試是否連接上數據庫,測試完請刪掉該代碼
// public static void main(String[] args) {
// Connection con= getCon();
// System.out.println(con);
// }
//1.聲明驅動和連接
//聲明數據庫驅動
private static final String className = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//聲明數據庫連接
private static final String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=db_student";
//聲明用戶名和密碼
private static final String username = "sa";
private static final String password = "sa";
//2.加載數據庫驅動(只需加載一次)
static{
try {
//加載驅動
Class.forName(className);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//3.獲得連接的方法
public static Connection getCon(){
Connection con = null;
try {
//從驅動管理中獲得一個連接
con = DriverManager.getConnection(url, username, password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return con;
}
//4.關閉連接
public static void close(Connection con, PreparedStatement ps, ResultSet rs){ //防SQL注入攻擊
try {
//關閉con
if(con!=null && !con.isClosed()) con.close();
//關閉ps
if(ps!=null) ps.close();
//關閉rs
if(rs!=null) rs.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(Connection con, PreparedStatement ps){
close(con, ps, null);
}
public static void close(Connection con){
close(con, null, null);
}
}
(整體來說兩者區別就只有申明驅動和連
接有區別)
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