java链接mysql以及sqlserver增删改查

java利用jdbc操作数据库

MySql：mysql-connector-java-5.1.12-bin.jar

SqlService：sqljdbc4.jar

import com.sun.org.apache.xpath.internal.SourceTree;
import com.sun.xml.internal.ws.api.server.LazyMOMProvider;

import java.sql.*;

/**
* Created by sunmig on 2016/11/7.
*/
public class SqlHelper {

/**
* MYSQL
* 连接数据库必备参数
*/
private static String driverName = "com.mysql.jdbc.Driver";
private static String dbUrl = "jdbc:mysql://localhost:3306/ngxykjc?characterEncoding=UTF-8";
private static String userName = "root";
private static String userPwd = "lalala";

/***
* SQLSERVER信息
*/
private static String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
private static String dbUrl = "jdbc:sqlserver://localhost:1433;databaseName=数据库名";
private static String userName = "sa";
private static String userPwd = "lalala";

/**
* 连接数据库
*/
public static Connection getConnection() {

try {
Class.forName(driverName);
Connection conn = null;
conn = DriverManager.getConnection(dbUrl, userName, userPwd);
return conn;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

public static void createTable(String SQL) {
Connection conn = null;
Statement stmt = null;
try {
conn = getConnection();
stmt = conn.createStatement();
stmt.execute(SQL);
System.out.println("---------- 操作成功 ----------");

} catch (SQLException e) {
e.printStackTrace();
System.out.println("---------- 操作失败 ----------");
} finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

/**
* 新增，更新，删除
*/
public static void SaveOrUpdateOrDetete(String SQL) {
Connection conn = null;
Statement stmt = null;
try {
conn = getConnection();
stmt = conn.createStatement();
int rs = stmt.executeUpdate(SQL);
if(rs > 0){
System.out.println("---------- 操作成功 ----------");
}

} catch (SQLException e) {
e.printStackTrace();
System.out.println("---------- 操作失败 ----------");
} finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

/**
*  查询
*/

public void Query(String SQL) {

Connection conn = null;
Statement stmt = null;
try{
conn = getConnection();
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(SQL);
while (rs.next()) {
System.out.println(rs.getString("字段名"));
}

} catch (SQLException e){
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}

public ResultSet getResults(String SQL) {

Connection conn = null;
Statement stmt = null;
try{
conn = getConnection();
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(SQL);
return rs;

} catch (SQLException e){
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return null;
}
}