JAvaプロジェクト接続mysqlデータベース
1.javaプロジェクトの作成
2. mysql-connection-.jarファイルを導入(https://dev.mysql.com/downloads/connector/j/)
3.DBHelper.javaを書く
4.テストクラス
2. mysql-connection-.jarファイルを導入(https://dev.mysql.com/downloads/connector/j/)
3.DBHelper.javaを書く
package com.ccl.dbConnection;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class DBHelper {
public static final String url = "jdbc:mysql://192.168.1.231/student";
public static final String name = "com.mysql.jdbc.Driver";
public static final String user = "aa";
public static final String password = "123456";
public Connection conn = null;
public PreparedStatement pst = null;
public DBHelper(String sql) {
try {
Class.forName(name);//
conn = DriverManager.getConnection(url, user, password);//
pst = conn.prepareStatement(sql);//
} catch (Exception e) {
e.printStackTrace();
}
}
public void close() {
try {
this.conn.close();
this.pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
4.テストクラス
package com.ccl.test;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.ccl.dbConnection.DBHelper;
public class ConnectionTest {
static String sql = null;
static DBHelper db1 = null;
static ResultSet ret = null;
public static void main(String[] args) {
sql = "select * from t_s_student";//SQL
db1 = new DBHelper(sql);// DBHelper
try {
ret = db1.pst.executeQuery();// ,
while (ret.next()) {
String uid = ret.getString(1);
String ufname = ret.getString(2);
String ulname = ret.getString(3);
String udate = ret.getString(4);
System.out.println(uid + "\t" + ufname + "\t" + ulname + "\t" + udate );
}//
ret.close();
db1.close();//
} catch (SQLException e) {
e.printStackTrace();
}
}
}