java操作mysql实例 让代码跑起来
用java操作mysql实例，代码测试通过无误，将数据库换成相应的配置即可
让代码先跑起来再说！
package mysql;
让代码先跑起来再说！
package mysql;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Demo01 {
public static void testJDBC() {
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("OK,Find the Driver");
} catch (ClassNotFoundException e) {
System.out.println("找不到驱动类，加载驱动失败");
e.printStackTrace();
}
}
public static void connectMysql() {
String url = "jdbc:mysql://192.168.16.241:3306/xxx";
String username = "root";
String password = "xxx";
try {
Connection con = DriverManager.getConnection(url,username,password);
System.out.println("-----Connection OK------");
Statement statement = con.createStatement();
String sql = "select * from stg_ad_uv_day where log_date='2015-01-15'";
ResultSet res = statement.executeQuery(sql);
String uv_type = null;
String adp_type = null;
while(res.next()) {
uv_type = res.getString("uv_type");
adp_type = res.getString("adp_type");
System.out.println("uv_type:" + uv_type + "\t" + "adp_type:" + adp_type);
}
} catch (Exception e) {
System.out.println("数据库连接失败");
e.printStackTrace();
}
}
public static void findCount() {
String url = "jdbc:mysql://192.168.16.241:3306/microlens_master";
String username = "root";
String password = "microlens";
try {
Connection con = DriverManager.getConnection(url,username,password);
System.out.println("-----Connection OK------");
Statement statement = con.createStatement();
String sql = "select count(*) from stg_ad_uv_day where log_date='2015-01-15'";
ResultSet res = statement.executeQuery(sql);
while (res.next()) {
int Num = res.getInt(1);
System.out.println(Num);
}
if (res != null) { //关闭记录集
try {
res.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(statement != null) { //关闭声明
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(con != null) { //关闭连接对象
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
} catch (Exception e) {
System.out.println("数据库连接失败");
e.printStackTrace();
}
}
public static void main(String[] args) {
findCount();
}
}