using MySql.Data.MySqlClient;
using System;
using System.Data;
using System.Collections;
public class DatabaseManager : CSingleton<DatabaseManager>
{
protected static string m_databaseIP = "localhost"; //IP地址
protected static string m_databasePort = "3306"; //端口号
protected static string m_userID = "root"; //MySQL数据库用户名
protected static string m_password = "123456"; //MySQL登陆密码
protected static string m_databaseName = "crh_emergency"; //链接的数据库的库名
protected static string m_connectionString; // 数据库连接字符串
/// <summary>
/// 测试是否链接上数据库
/// </summary>
/// <returns></returns>
public bool TestConnection()
{
bool isConnected = true;
//发送数据库连接字段 创建连接通道
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
try
{
//打开连接通道
connection.Open();
}
catch (MySqlException E)
{
//如果有异常 则连接失败
isConnected = false;
throw new Exception(E.Message);
}
finally
{
//关闭连接通道
connection.Close();
}
}
return isConnected;
}
/// <summary>
/// 利用字符串组拼方式来编写数据库的连接
/// </summary>
public static void Init()
{
m_connectionString = string.Format("Server = {0}; port = {1}; Database = {2}; User ID = {3}; Password = {4}; Pooling=true; Charset = utf8;", m_databaseIP, m_databasePort, m_databaseName, m_userID, m_password);
}
/// <summary>
/// 创建表
/// </summary>
/// <param name="name">表名</param>
/// <param name="cols">字段名</param>
/// <param name="colType">字段类型</param>
/// <returns></returns>
public static int CreateTable(string name, string[] cols, string[] colType)
{
if (cols.Length != colType.Length)
{
throw new Exception("columns.Length != colType.Length");
}
string query = "CREATE TABLE " + name + " (" + cols[0] + " " + colType[0];
for (int i = 1; i < cols.Length; ++i)
{
query += ", " + cols[i] + " " + colType[i];
}
query += ")";
return ExecuteNonQuery(query);
}
/// <summary>
/// 创建表默认ID自动增长
/// </summary>
/// <param name="name">表名</param>
/// <param name="cols">字段名</param>
/// <param name="colType">字段类型</param>
/// <returns></returns>
public static int CreateTableAutoID(string name, string[] cols, string[] colType)
{
if (cols.Length != colType.Length)
{
throw new Exception("columns.Length != colType.Length");
}
string query = "CREATE TABLE " + name + " (" + cols[0] + " " + colType[0] + " NOT NULL AUTO_INCREMENT";
for (int i = 1; i < cols.Length; ++i)
{
query += ", " + cols[i] + " " + colType[i];
}
query += ", PRIMARY KEY (" + cols[0] + ")" + ")";
return ExecuteNonQuery(query);
}
/// <summary>
/// 插入一条数据,包括所有,不适用自动累加ID。
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="values"></param>
/// <returns></returns>
public static int InsertInto(string tableName, string[] values)
{
string query = "INSERT INTO " + tableName + " VALUES (" + "'" + values[0] + "'";
for (int i = 1; i < values.Length; ++i)
{
query += ", " + "'" + values[i] + "'";
}
query += ")";
return ExecuteNonQuery(query);
}
/// <summary>
/// 插入部分ID
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="cols"></param>
/// <param name="values"></param>
/// <returns></returns>
public static int InsertInto(string tableName, string[] cols, string[] values)
{
if (cols.Length != values.Length)
{
throw new Exception("columns.Length != colType.Length");
}
string query = "INSERT INTO " + tableName + " (" + cols[0];
for (int i = 1; i < cols.Length; ++i)
{
query += ", " + cols[i];
}
query += ") VALUES (" + "'" + values[0] + "'";
for (int i = 1; i < values.Length; ++i)
{
query += ", " + "'" + values[i] + "'";
}
query += ")";
return ExecuteNonQuery(query);
}
/// <summary>
/// 当指定字段满足一定条件时,更新指定字段的数据
/// 例如更新在user这个表中字段名为userAccount的值等于10086时,将对应userPwd字段的值改成newMd5SumPassword
/// ("users", new string[] { "userPwd" }, new string[] { newMd5SumPassword }, "userAccount", "10086")
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="cols">字段</param>
/// <param name="colsValues">字段值</param>
/// <param name="selectKey">指定的字段</param>
/// <param name="selectValue">指定字段满足的条件</param>
/// <returns></returns>
public static int UpdateInto(string tableName, string[] cols, string[] colsValues, string selectKey, string selectValue)
{
string query = "UPDATE " + tableName + " SET " + cols[0] + " = " + "'" + colsValues[0] + "'";
for (int i = 1; i < colsValues.Length; ++i)
{
query += ", " + cols[i] + " =" + "'" + colsValues[i] + "'";
}
query += " WHERE " + selectKey + " = " + selectValue;
return ExecuteNonQuery(query);
}
/// <summary>
/// 删除
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="cols">字段</param>
/// <param name="colsValues">字段值</param>
/// <returns></returns>
public static int Delete(string tableName, string[] cols, string[] colsValues)
{
string query = "DELETE FROM " + tableName + " WHERE " + cols[0] + " = " + colsValues[0];
for (int i = 1; i < colsValues.Length; ++i)
{
query += " or " + cols[i] + " = " + colsValues[i];
}
return ExecuteNonQuery(query);
}
/// <summary>
/// 查询指定字段数据中满足条件的
/// DataSet内存中的数据库,DataSet是不依赖于数据库的独立数据集合,是一种不包含表头的纯数据文件
/// 有条件的查询,查询在users这个表当中,只需要字段名为userAccount,userPwd,userName,ID这几个字段对应的数据,
/// 满足条件为 userAccount对应的value=account, userPwd对应的value=md5Password;
/// ("users", new string[] { "userAccount", "userPwd", "userName", "ID" }, new string[] { "userAccount", "userPwd" }, new string[] { "=", "=" }, new string[] { account, md5Password });
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="items">字段名</param>
/// <param name="cols">字段名</param>
/// <param name="operations">条件运算符</param>
/// <param name="values">满足的条件值</param>
/// <returns></returns>
public static DataSet SelectWhere(string tableName, string[] items, string[] cols, string[] operations, string[] values)
{
if (cols.Length != operations.Length || operations.Length != values.Length)
{
throw new Exception("col.Length != operation.Length != values.Length");
}
string query = "SELECT " + items[0];
for (int i = 1; i < items.Length; ++i)
{
query += ", " + items[i];
}
query += " FROM " + tableName + " WHERE " + cols[0] + operations[0] + "'" + values[0] + "' ";
for (int i = 1; i < cols.Length; ++i)
{
query += " AND " + cols[i] + operations[i] + "'" + values[i] + "' ";
}
return ExecuteQuery(query);
}
/// <summary>
/// 查询指定字段
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="items">字段名</param>
/// <returns></returns>
public static DataSet Select(string tableName, string[] items)
{
string query = "SELECT " + items[0];
for (int i = 1; i < items.Length; ++i)
{
query += ", " + items[i];
}
query += " FROM " + tableName;
return ExecuteQuery(query);
}
/// <summary>
/// 查询所有字段
/// </summary>
/// <param name="tableName">表名</param>
/// <returns></returns>
public static DataSet Select(string tableName)
{
string query = "SELECT * FROM " + tableName;
return ExecuteQuery(query);
}
#region 执行简单SQL语句
/// <summary>
/// 执行SQL语句,返回影响的记录数。用于Update、Insert和Delete
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <returns>影响的记录数</returns>
public static int ExecuteNonQuery(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
}
/// <summary>
/// 执行SQL语句,设置命令的执行等待时间
/// </summary>
/// <param name="SQLString"></param>
/// <param name="Times"></param>
/// <returns></returns>
public static int ExecuteNonQueryByTime(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
cmd.CommandTimeout = Times;
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
}
/// <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 ExecuteNonQueryTran(ArrayList SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(m_connectionString))
{
conn.Open();
MySqlCommand cmd = new MySqlCommand();
cmd.Connection = conn;
MySqlTransaction 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 (MySqlException E)
{
tx.Rollback();
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
conn.Close();
}
}
}
/// <summary>
/// 执行带一个存储过程参数的的SQL语句。
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章,有特殊符号,可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static int ExecuteNonQuery(string SQLString, string content)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
MySqlCommand cmd = new MySqlCommand(SQLString, connection);
MySqlParameter myParameter = new MySqlParameter("@content", MySqlDbType.Text);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <summary>
/// 执行带一个存储过程参数的的SQL语句。
/// </summary>
/// <param name="SQLString">SQL语句</param>
/// <param name="content">参数内容,比如一个字段是格式复杂的文章,有特殊符号,可以通过这个方式添加</param>
/// <returns>影响的记录数</returns>
public static object ExecuteScalar(string SQLString, string content)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
MySqlCommand cmd = new MySqlCommand(SQLString, connection);
MySqlParameter myParameter = new MySqlParameter("@content", MySqlDbType.Text);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((System.Object.Equals(obj, null)) || (System.Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySqlException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <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 ExecuteNonQueryInsertImg(string strSQL, byte[] fs)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
MySqlCommand cmd = new MySqlCommand(strSQL, connection);
MySqlParameter myParameter = new MySqlParameter("@fs", MySqlDbType.Binary);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (MySqlException 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 (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((System.Object.Equals(obj, null)) || (System.Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySqlException e)
{
throw new Exception(e.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
}
/// <summary>
/// 执行查询语句,返回MySqlDataReader(使用该方法切记要手工关闭MySqlDataReader和连接)
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader ExecuteReader(string strSQL)
{
MySqlConnection connection = new MySqlConnection(m_connectionString);
MySqlCommand cmd = new MySqlCommand(strSQL, connection);
try
{
connection.Open();
MySqlDataReader myReader = cmd.ExecuteReader();
return myReader;
}
catch (MySqlException e)
{
throw new Exception(e.Message);
}
//finally //不能在此关闭,否则,返回的对象将无法使用
//{
// cmd.Dispose();
// connection.Close();
//}
}
/// <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 ExecuteQuery(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter da = new MySqlDataAdapter(SQLString, connection);
da.Fill(ds);
}
catch (MySqlException ex)
{
connection.Close();
throw new Exception(ex.Message);
}
finally
{
connection.Close();
}
return ds;
}
}
/// <summary>
/// 执行查询语句,返回DataSet,设置命令的执行等待时间
/// </summary>
/// <param name="SQLString"></param>
/// <param name="Times"></param>
/// <returns></returns>
public static DataSet ExecuteQuery(string SQLString, int Times)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.SelectCommand.CommandTimeout = Times;
command.Fill(ds, "ds");
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
finally
{
connection.Close();
}
return ds;
}
}
/// <summary>
/// 获取SQL查询记录条数
/// </summary>
/// <param name="sqlstr">SQL语句</param>
/// <returns></returns>
public static int GetRowsNum(string SQLString)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
return ds.Tables[0].Rows.Count;
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
finally
{
connection.Close();
}
}
}
#endregion 执行简单SQL语句
#region 执行带参数的SQL语句
/// <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 ExecuteNonQuery(string SQLString, params System.Object[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (MySqlException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
}
/// <summary>
/// 执行多条SQL语句,实现数据库事务。
/// </summary>
/// <param name="SQLStringList">SQL语句的哈希表(key为sql语句,value是该语句的 Object[])</param>
public static void ExecuteNonQueryTran(Hashtable SQLStringList)
{
using (MySqlConnection conn = new MySqlConnection(m_connectionString))
{
conn.Open();
using (MySqlTransaction trans = conn.BeginTransaction())
{
MySqlCommand cmd = new MySqlCommand();
try
{
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
System.Object[] cmdParms = (System.Object[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
trans.Commit();
}
}
catch
{
trans.Rollback();
throw;
}
finally
{
cmd.Dispose();
conn.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, params System.Object[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
using (MySqlCommand cmd = new MySqlCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((System.Object.Equals(obj, null)) || (System.Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (MySqlException e)
{
throw new Exception(e.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
}
/// <summary>
/// 执行查询语句,返回MySqlDataReader (使用该方法切记要手工关闭MySqlDataReader和连接)
/// </summary>
/// <param name="strSQL">查询语句</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader ExecuteReader(string SQLString, params System.Object[] cmdParms)
{
MySqlConnection connection = new MySqlConnection(m_connectionString);
MySqlCommand cmd = new MySqlCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
MySqlDataReader myReader = cmd.ExecuteReader();
cmd.Parameters.Clear();
return myReader;
}
catch (MySqlException e)
{
throw new Exception(e.Message);
}
//finally //不能在此关闭,否则,返回的对象将无法使用
//{
// cmd.Dispose();
// connection.Close();
//}
}
/// <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 ExcuteQuery(string SQLString, params System.Object[] cmdParms)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (MySqlException ex)
{
throw new Exception(ex.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
return ds;
}
}
}
private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, string cmdText, System.Object[] 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 (MySqlParameter parameter in cmdParms)
{
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
cmd.Parameters.Add(parameter);
}
}
}
#endregion 执行带参数的SQL语句
#region 存储过程操作
/// <summary>
/// 执行存储过程 (使用该方法切记要手工关闭MySqlDataReader和连接)
/// 手动关闭不了,所以少用,MySql.Data组组件还没解决该问题
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>MySqlDataReader</returns>
public static MySqlDataReader RunProcedure(string storedProcName, System.Object[] parameters)
{
MySqlConnection connection = new MySqlConnection(m_connectionString);
MySqlDataReader returnReader;
connection.Open();
MySqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
returnReader = command.ExecuteReader();
//Connection.Close(); 不能在此关闭,否则,返回的对象将无法使用
return returnReader;
}
/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <param name="tableName">DataSet结果中的表名</param>
/// <returns>DataSet</returns>
public static DataSet RunProcedure(string storedProcName, System.Object[] parameters, string tableName)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
MySqlDataAdapter sqlDA = new MySqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
public static DataSet RunProcedure(string storedProcName, System.Object[] parameters, string tableName, int Times)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
DataSet dataSet = new DataSet();
connection.Open();
MySqlDataAdapter sqlDA = new MySqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
sqlDA.SelectCommand.CommandTimeout = Times;
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns></returns>
public static void RunProcedureNull(string storedProcName, System.Object[] parameters)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
connection.Open();
MySqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
command.ExecuteNonQuery();
connection.Close();
}
}
/// <summary>
/// 执行存储过程,返回第一行第一列的数据
/// </summary>
/// <param name="CommandText">T-SQL语句;例如:"pr_shell 'dir *.exe'"或"select * from sysobjects where xtype=@xtype"</param>
/// <param name="parameters">SQL参数</param>
/// <returns>返回第一行第一列,用Convert.To{Type}把类型转换为想要的类型</returns>
public object ExecuteScaler(string storedProcName, System.Object[] parameters)
{
using (MySqlConnection connection = new MySqlConnection(m_connectionString))
{
object returnObjectValue;
connection.Open();
MySqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
returnObjectValue = command.ExecuteScalar();
connection.Close();
return returnObjectValue;
}
}
/// <summary>
/// 构建 SqlCommand 对象(用来返回一个结果集,而不是一个整数值)
/// </summary>
/// <param name="connection">数据库连接</param>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>SqlCommand</returns>
private static MySqlCommand BuildQueryCommand(MySqlConnection connection, string storedProcName, System.Object[] parameters)
{
MySqlCommand command = new MySqlCommand(storedProcName, connection);
command.CommandType = CommandType.StoredProcedure;
foreach (MySqlParameter parameter in parameters)
{
if (parameter != null)
{
// 检查未分配值的输出参数,将其分配以DBNull.Value.
if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
(parameter.Value == null))
{
parameter.Value = DBNull.Value;
}
command.Parameters.Add(parameter);
}
}
return command;
}
/// <summary>
/// 创建 MySqlCommand 对象实例(用来返回一个整数值)
/// </summary>
/// <param name="storedProcName">存储过程名</param>
/// <param name="parameters">存储过程参数</param>
/// <returns>MySqlCommand 对象实例</returns>
private static MySqlCommand BuildIntCommand(MySqlConnection connection, string storedProcName, System.Object[] parameters)
{
MySqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new MySqlParameter("ReturnValue",
MySqlDbType.Int32, 4, ParameterDirection.ReturnValue,
false, 0, 0, string.Empty, DataRowVersion.Default, null));
return command;
}
#endregion 存储过程操作
}