//Java連結Mysql的類
class operatedb
{
String driverName = "com.mysql.jdbc.Driver"; //加載JDBC驅動
String dbURL = "jdbc:mysql://127.0.0.1:3306/student"; //要連接配接的伺服器,資料庫再此未指出
Connection dbConn;
Statement stmt;
public operatedb(String userName,String userPwd)//構造器的參數指明要連接配接的資料庫、使用者名和密碼
{
try{
Class.forName(driverName);
dbConn = DriverManager.getConnection(dbURL, userName, userPwd);
}catch (Exception e) {
System.out.println("connection error!");
e.printStackTrace();
}
}
public void anyoperate(String sqls)
{
try{
stmt=dbConn.createStatement();
stmt.execute(sqls);//将SLQ語句嵌入execute()方法中
stmt.close() ;
}catch (Exception e) {
System.out.println("anyoperate error!");
}
}
public void insert(String sqls,String[] values)
{
try{
PreparedStatement prepare=dbConn.prepareStatement(sqls);
for(int i=0;i<values.length;i++)
prepare.setString(i+1,values[i]);//指定values[0]為第一個參數,也就是代替sqls中的第一個“?”,values[1]為第二個參數,以此類推
prepare.execute();
prepare.close();
}catch (Exception e) {
System.out.println(e);
}
}
public void query(String sqls)
{
try{
stmt=dbConn.createStatement();
ResultSet rset=stmt.executeQuery(sqls);
while(rset.next())
{
for(int i=1;i<=5;i++) {
System.out.print(rset.getString(i)+"\t");
}
System.out.println();
}
rset.close() ;
stmt.close() ;
}catch (Exception e) {
System.out.println("query error!");
}
}
public void closeconn()
{
try{
dbConn.close();
}catch (Exception e) {
System.out.println("close error!");
}
}
}
//增删改查執行個體化操作
//useoperatedb.java
import java.io.*;
import java.sql.*;
public class useoperatedb
{
public static void main(String[] srg) throws IOException
{
String s1,s2;
operatedb op1=new operatedb("root","123456");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
/*System.out.println("請輸入要查詢的專業:");
s2=br.readLine();
s1="select * from st1 where major='";
s1=s1+s2+"'";
op1.query(s1);*/
System.out.println("添加一--------------");
String[] v={"090811203","王五","女","90-05-05","資訊"};
s1="insert into st1 values(?,?,?,?,?)";
op1.insert(s1,v);
System.out.println("添加二--------------");
String[] v1={"090811204","王六","男","90-06-06","計算機"};
s1="insert into st1 values('"+v1[0]+"','"+v1[1]+"','"+v1[2]+"','"+v1[3]+"','"+v1[4]+"')";
op1.anyoperate(s1);
/*System.out.println("修改--------------");
s1="update st1 set major='計算機' where major='computer'";
op1.anyoperate(s1);*/
System.out.println("删除--------------");
s1="delete from st1 where major='計算機'";
op1.anyoperate(s1);
System.out.println("查詢--------------");
s1="select * from st1 ";
op1.query(s1);
op1.closeconn();
}
}