一、Mysql建表
1、使用界面化Mysql如何简单建表:
①连接:点击连接→输入安装时的密码→连接
②建立数据库
右键localhost→创建数据库→输入数据库名→确定
③打开数据库
④建表:
右键表→创建表→按照需求建立表→点击保存输入表名
⑤试着插入数据
⑥查询:
右键查询→创建查询
在查询编辑器输入查询语句:select * from tb_demo
点击运行就可查看到查询结果。
二、连接eclipse
首先创建一个web工程并导入架包
然后:
第一种方式:
创建util包,然后在里面创建config.properties文件,里面写
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/stu?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT
user=root
pwd=123
注意:
接着创建DBAccess.class
里面写
package com.songwanxi.util;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
/**
* 提供了一组获得或关闭数据库对象的方法
*
*/
public class DBAccess {
private static String driver;
private static String url;
private static String user;
private static String password;
static {// 静态块执行一次,加载 驱动一次
try {
InputStream is = DBAccess.class.getResourceAsStream("config.properties");
Properties properties = new Properties();
properties.load(is);
driver = properties.getProperty("driver");
url = properties.getProperty("url");
user = properties.getProperty("user");
password = properties.getProperty("pwd");
Class.forName(driver);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
/**
* 获得数据连接对象
*
* @return
*/
public static Connection getConnection() {
try {
Connection conn = DriverManager.getConnection(url, user, password);
return conn;
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static void close(ResultSet rs) {
if (null != rs) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
public static void close(Statement stmt) {
if (null != stmt) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
public static void close(Connection conn) {
if (null != conn) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
public static void close(Connection conn, Statement stmt, ResultSet rs) {
close(rs);
close(stmt);
close(conn);
}
public static boolean isOracle() {
return "oracle.jdbc.driver.OracleDriver".equals(driver);
}
public static boolean isSQLServer() {
return "com.microsoft.sqlserver.jdbc.SQLServerDriver".equals(driver);
}
public static boolean isMysql() {
return "com.mysql.jdbc.Driver".equals(driver);
}
public static void main(String[] args) {
Connection conn = DBAccess.getConnection();
DBAccess.close(conn);
System.out.println("isOracle:" + isOracle());
System.out.println("isSQLServer:" + isSQLServer());
System.out.println("isMysql:" + isMysql());
System.out.println("数据库连接(关闭)成功");
}
}
尝试运行一次:
连接成功!
第二种方法:
直接写DBAccess2.class
package com.songwanxi.util;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
/**
* 提供了一组获得或关闭数据库对象的方法
*
*/
public class DBAccess2 {
private static String driver;
private static String url;
private static String user;
private static String password;
static {// 静态块执行一次,加载 驱动一次
try {
driver = "com.mysql.jdbc.Driver";
url = "jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT";
user = "root";
password = "123";
Class.forName(driver);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
/**
* 获得数据连接对象
*
* @return
*/
public static Connection getConnection() {
try {
Connection conn = DriverManager.getConnection(url, user, password);
return conn;
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static void close(ResultSet rs) {
if (null != rs) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
public static void close(Statement stmt) {
if (null != stmt) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
public static void close(Connection conn) {
if (null != conn) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
public static void close(Connection conn, Statement stmt, ResultSet rs) {
close(rs);
close(stmt);
close(conn);
}
public static boolean isOracle() {
return "oracle.jdbc.driver.OracleDriver".equals(driver);
}
public static boolean isSQLServer() {
return "com.microsoft.sqlserver.jdbc.SQLServerDriver".equals(driver);
}
public static boolean isMysql() {
return "com.mysql.jdbc.Driver".equals(driver);
}
public static void main(String[] args) {
Connection conn = DBAccess2.getConnection();
DBAccess2.close(conn);
System.out.println("isOracle:" + isOracle());
System.out.println("isSQLServer:" + isSQLServer());
System.out.println("isMysql:" + isMysql());
System.out.println("数据库连接2(关闭)成功");
}
}
测试一下:
连接成功!