using CropOffline;
using Oracle.ManagedDataAccess.Client;
public OracleConnection oraConnection;
private bool oraConnect()
{
try
{
//连接字符串
string strOraConnect = "User ID=建立连接用的账号;Password=建立连接用的密码;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST =localhost)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME =数据库名称)))";
oraConnection = new OracleConnection(strOraConnect);
//给全局变量赋值
DbHelperOra.connectionString = strOraConnect;
oraConnection.Open();
return true;//string.Empty;
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
return false;
}
}
private void Form1_Load(object sender,EventArgs e)
{
oraConnect();
dataGridView1.DataSource=DbHelperOra.QueryToDataTable("select 哼哼哈嘿 from dual");
}
View Code
需要DbHelperOra这个类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
//For Connect Oracle
using Oracle.ManagedDataAccess.Client;
//For ArrayList C#
using System.Collections;
//For DataSet C#
using System.Data;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
namespace CropOffline
{
[Serializable] //表示该类可被序列化
class DbHelperOra
{
//
//数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.
public static string connectionString = "null";//PubConstant.ConnectionString;
public DbHelperOra()
{
}
#region 公用方法
//J 为啥要+1呢，我就想不通了。表格中的数据类型需要是number
public static int GetMaxID(string FieldName, string TableName)
{
string strsql = "select max(" + FieldName + ") from " + TableName;
object obj = GetSingle(strsql);
if (obj == null)
{
return 1;
}
else
{
return int.Parse(obj.ToString());
}
}
//J 调试用，用来检查连接字符串是否有误
public static string GetMaxIDT(string FieldName, string TableName)
{
string strsql = "select max(" + FieldName + ") from " + TableName;
object obj = GetSingle(strsql);
if (obj == null)
{
return 1.ToString();
}
else
{
return obj.ToString();
//return strsql;
}
}
/// <summary>
/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
/// </summary>
/// <param name="strSQL">SQL语句</param>
/// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
OracleCommand cmd = new OracleCommand(strSQL, connection);
OracleParameter myParameter = new OracleParameter("@fs", OracleDbType.LongRaw);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (OracleException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（object）。
/// </summary>
/// <param name="SQLString">计算查询结果语句</param>
/// <returns>查询结果（object）</returns>
public static object GetSingle(string SQLString)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand cmd = new OracleCommand(SQLString, connection)
)
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (OracleException e)
{
connection.Close();
throw new Exception(e.Message);
}
}
}
}
/// 将一个object对象序列化，返回一个byte[]
/// </summary>
/// <param name="obj">能序列化的对象</param>
/// <returns></returns>
public static byte[] ObjectToBytes(object obj)
{
if(obj!=null)
{
using (MemoryStream ms = new MemoryStream())
{
IFormatter formatter = new BinaryFormatter();
formatter.Serialize(ms, obj);
return ms.ToArray();
}
}
return null;
}
#region 测试序列化byte类型
public static byte[] SerializeObject(object obj)
{
IFormatter formatter = new BinaryFormatter();
//string result = string.Empty;
using (MemoryStream stream = new MemoryStream())
{
formatter.Serialize(stream, obj);
byte[] byt = new byte[stream.Length];
byt = stream.ToArray();
// result = Encoding.UTF8.GetString(byt, 0, byt.Length);
//result = Convert.ToBase64String(byt);
stream.Flush();
return byt;
}
}
#endregion
/// <summary>
/// 执行一条计算查询结果语句，返回查询结果（object）。
/// </summary>
/// <param name="SQLString">计算查询结果语句</param>
/// <returns>查询结果（object）</returns>
public static object GetSingle(string SQLString, params OracleParameter[] cmdParms)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand cmd = new OracleCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (OracleException e)
{
throw new Exception(e.Message);
}
}
}
}
private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, string cmdText, OracleParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = CommandType.Text;//cmdType;
if (cmdParms != null)
{
foreach (OracleParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
/// <summary>
/// 执行多条SQL语句，实现数据库事务。
/// </summary>
/// <param name="SQLStringList">多条SQL语句</param>
public static void ExecuteSqlTran(ArrayList SQLStringList)
{
using (OracleConnection conn = new OracleConnection(connectionString))
{
conn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
OracleTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n].ToString();
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch (OracleException E)
{
tx.Rollback();
throw new Exception(E.Message);
}
}
}
/// <summary>
/// 执行SQL语句，返回影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(string SQLString)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand cmd = new OracleCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (OracleException E)
{
connection.Close();
throw new Exception(E.Message);
}
}
}
}
/// <summary>
/// 执行SQL语句，返回影响的记录数
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteSql(string SQLString, params OracleParameter[] cmdParms)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
using (OracleCommand cmd = new OracleCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (OracleException E)
{
throw new Exception(E.Message);
}
}
}
}
public static bool Exists(string strSql)
{
object obj = GetSingle(strSql);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
/// <summary>
/// 执行查询语句，返回DataSet
/// </summary>
/// <param name="SQLString">查询语句</param>
/// <returns>DataSet</returns>
public static DataSet Query(string SQLString)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
OracleDataAdapter command = new OracleDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (OracleException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
/// <summary>
/// 执行查询语句，返回DataTable
/// </summary>
/// <param name="SQLString">查询语句</param>
/// <returns>DataSet</returns>
public static DataTable QueryToDataTable(string SQLString)
{
using (OracleConnection connection = new OracleConnection(connectionString))
{
DataTable dt = new DataTable();
try
{
connection.Open();
OracleDataAdapter command = new OracleDataAdapter(SQLString, connection);
command.Fill(dt);
}
catch (OracleException ex)
{
throw new Exception(ex.Message);
}
return dt;
}
}
#endregion
}
}
DbHelperOra.cs
橘子Jane
