JDBC公共操作类

时间:2021-01-15 14:50:56
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement; public class DBUtil {
public static final String DRIVER = "com.mysql.jdbc.Driver";
public static final String URL = "jdbc:mysql://localhost:3306/db";
public static final String USERNAME = "root";
public static final String PASSWORD = "root"; /**
* 通过静态代码块 注册数据库驱动
*/
static {
try {
Class.forName(DRIVER);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
} /**
* 获得Connection
*
* @return
*/
public static Connection getConnection() {
Connection conn = null;
try {
conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
} /**
* 获得Statement
*
* @return
*/
public static Statement getStatement() {
Statement st = null;
try {
st = getConnection().createStatement();
} catch (SQLException e) {
e.printStackTrace();
}
return st;
} /**
* 关闭ResultSet
*
* @param rs
*/
public static void closeResultSet(ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
} /**
* 关闭Statement
*
* @param st
*/
public static void closeStatement(Statement st) {
if (st != null) {
try {
st.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
} /**
* 关闭Connection
*
* @param conn
*/
public static void closeConnection(Connection conn) {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
} /**
* 关闭全部
*
* @param rs
* @param sta
* @param conn
*/
public static void closeAll(ResultSet rs, Statement sta, Connection conn) {
closeResultSet(rs);
closeStatement(sta);
closeConnection(conn);
} }