package DB;
import java.sql.*;
public class DBManager {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
String DB = "連接數據庫名"; // 數據庫名
String Password = "輸入數據庫密碼"; // 數據庫登陸密碼
String user = "root"; // 連接數據庫用戶名
String setcharcter = "utf8"; // 數據庫字符設置
// 返回數據庫連接對象
public Connection Creatconn() {
conn = null;
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
String url = "jdbc:mysql://localhost:3306/" + DB + "?user=" + user
+ "&password=" + Password
+ "&useUnicode=true&characterEncoding=" + setcharcter;
conn = DriverManager.getConnection(url);
return conn;
} catch (Exception fe) {
System.err.println("Creatconn(): " + fe.getMessage());
return null;
}
}
// 返回狀態集對象
public Statement CreatStat() {
stmt = null;
try {
if (conn == null) {
conn = this.Creatconn();
}
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
return stmt;
} catch (Exception fe) {
System.err.println("CreatStat(): " + fe.getMessage());
return null;
}
}
// 返回記錄集對象
public ResultSet getResult(String sql) {
rs = null;
try {
stmt = this.CreatStat();
rs = stmt.executeQuery(sql);
return rs;
} catch (SQLException ex) {
System.err.println("getResult: " + ex.getMessage());
return null;
}
}
/**
* 關閉所有數據庫連接相關對象
*/
public void closeAll(Connection conn, PreparedStatement ps, ResultSet rs)
throws SQLException {
if (rs != null) {
rs.close();
}
if (ps != null) {
ps.close();
}
if (conn != null && !conn.isClosed()) {
conn.close();
}
}
// 執行更新 刪除語句
public boolean executeSql(String sql) {
try {
stmt = this.CreatStat();
stmt.executeUpdate(sql);
// conn.commit();
return true;
} catch (Exception e) {
System.err.println("exectueSql: " + e.toString());
return false;
}
}
public void Release() throws SQLException {
if (rs != null) {
rs.close();
}
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
}
/**
* @param sql
* @param paras 代表?裏面的參數
* @return
* @throws SQLException
* 操作insert,update,delete,支持?傳參的用法
*/
public int insertUpdateDelete(String sql, String[] paras)
throws SQLException {
Connection conn = null;
PreparedStatement ps = null;
int count = 0;
try {
conn = this.Creatconn();
ps = conn.prepareStatement(sql);
for (int i = 0; i < paras.length; i++) {
ps.setString(i + 1, paras[i]);
}
count = ps.executeUpdate();
} finally {
closeAll(conn, ps, null);
}
return count;
}
}