JDBC动态SQL语句连接orcale数据库的工具类



import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DbUtil {
 private static final String JDBC_DRIVER = "oracle.jdbc.driver.OracleDriver";
 private static String JDBC_URL = "jdbc:oracle:thin:@172.22.246.26:1521:orcl";
 private static String USER = "java1";
 private static String PASS = "java1";
 private Connection conn = null;
 private PreparedStatement stmt = null;
 private ResultSet rs = null;
 static {
  try {
   Class.forName(JDBC_DRIVER);
  } catch (ClassNotFoundException e) {
   System.out.println("请添加驱动包");
  }
 }

 public DbUtil() {
 }

 public Connection getConn() {
  try {
   if (conn == null || conn.isClosed()) {
    conn = DriverManager.getConnection(JDBC_URL, USER, PASS);
   }

  } catch (SQLException e) {
   e.printStackTrace();
  }
  return conn;
 }

 public int executeUpdate(String sql, Object... params) {
  int rlt = -1;
  try {
   getConn();
   stmt = conn.prepareStatement(sql);
   putParams(params, stmt);
   rlt = stmt.executeUpdate();
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return rlt;
 }

 public ResultSet executeQuery(String sql, Object... params) {
  try {
   // 2.获取连接
   getConn();
   stmt = conn.prepareStatement(sql);
   putParams(params, stmt);
   // 3.执行事务
   rs = stmt.executeQuery();
  } catch (SQLException e) {
   e.printStackTrace();
  }
  return rs;
 }

 public void close() {
  try {
   if (rs != null) {
    rs.close();
   }
   if (stmt != null) {
    stmt.close();
   }
   if (conn != null) {
    conn.close();
   }
  } catch (SQLException e) {
   e.printStackTrace();
  }
 }

 private void putParams(Object[] params, PreparedStatement stmt)
   throws SQLException {
  if (params != null) {
   for (int i = 1; i <= params.length; i++) {
    stmt.setObject(i, params[i - 1]);
   }
  }
 }

}