cyf
335 lines
9.9 KiB
C#
335 lines
9.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Data;
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using System.Data.OleDb;
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using System.Windows.Forms;
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namespace Lskj_SyncAccessData
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{
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public class AccessDBConfig
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{
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// 连接数据源
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private OleDbConnection conn = null;
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private static string connStr = string.Empty;
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private static AccessDBConfig _instance = null;
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/// <summary>
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/// DBConfig静态单例对象
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/// </summary>
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/// <value>The instance.</value>
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public static AccessDBConfig Instance
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{
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get
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{
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if (_instance == null)
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{
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_instance = new AccessDBConfig();
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}
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return _instance;
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}
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}
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/// <summary>
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/// <para>说明：创建数据库连接</para>
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/// <para>创建人：钱雄</para>
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/// <para>创建日期</para>
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/// <para>修改人：</para>
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/// <para>修改日期：</para>
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/// <para>修改备注：</para>
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/// <para>版本：1.0</para>
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/// </summary>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
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public OleDbConnection CreateConnection(string conStr)
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{
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connStr = conStr;
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if (conn != null)
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{
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try
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{
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conn.Close();
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conn.Dispose();
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}
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catch (Exception)
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{
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}
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conn = null;
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}
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try
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{
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conn = new OleDbConnection(connStr);
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if (conn.State == ConnectionState.Closed)
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{
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conn.Open();
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}
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return conn;
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}
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catch (Exception ex)
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{
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MessageBox.Show(ex.Message);
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return null;
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}
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}
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/// <summary>
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/// <para>说明：查询Access数据库表中是否包含某个字段</para>
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/// <para>创建人：龚宇超</para>
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/// <para>创建日期：2017-08-07 </para>
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/// <para>修改人：</para>
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/// <para>修改日期：</para>
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/// <para>修改备注：</para>
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/// <para>版本：1.0</para>
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/// </summary>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
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public bool checkField(String sTblName, String sFldName)
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{
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bool isExist = false;
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try
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{
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//OleDbConnection aConnection = new OleDbConnection(DB.getConnectStr());
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//aConnection.Open();
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object[] oa = { null, null, sTblName, sFldName };
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DataTable schemaTable = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Columns, oa);
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if (schemaTable.Rows.Count == 0)
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{
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isExist = false;
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}
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else
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{
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isExist = true;
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}
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//MessageBox.Show((schemaTable.Rows.Count == 0 ? "不存在" : "存在"));
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//aConnection.Close();
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}
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catch (Exception err)
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{
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MessageBox.Show(err.Message);
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}
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return isExist;
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}
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/// <summary>
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/// 执行SQL语句，返回影响的记录数
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/// </summary>
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/// <param name="SQLString">SQL语句</param>
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/// <returns>影响的记录数</returns>
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public int ExecuteSql(string SQLString)
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{
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using (OleDbConnection connection = new OleDbConnection(connStr))
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{
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using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
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{
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try
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{
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connection.Open();
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int rows = cmd.ExecuteNonQuery();
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return rows;
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}
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catch (System.Data.OleDb.OleDbException E)
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{
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connection.Close();
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throw new Exception(E.Message);
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}
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}
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}
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}
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/// <summary>
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/// 执行返回多个查询时使用,返回DataTable类型
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/// </summary>
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/// <param name="sql">Sql命令</param>
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/// <param name="cmdtype">SQL语句（CommandType.Text）或者存储过程(CommandType.StoredProcedure)</param>
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/// <param name="pms">参数</param>
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/// <returns></returns>
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public DataTable ExecuteDataTable(string sql)
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{
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DataTable dt = new DataTable();
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try
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{
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//通过adapter读取数据。
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using (OleDbDataAdapter adapter = new OleDbDataAdapter(sql, connStr))
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{
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adapter.Fill(dt);
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return dt;
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}
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}
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catch (Exception)
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{
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throw;
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}
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}
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/// <summary>
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/// 根据SQL查询返回DataSet对象，如果没有查询到则返回NULL
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/// </summary>
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/// <param name="sql">查询语句</param>
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/// <returns>DataSet</returns>
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public DataSet GetDataSet(string sql)
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{
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DataSet ds = new DataSet();
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try
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{
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this.CreateConnection(connStr);
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OleDbCommand cmd = new OleDbCommand(sql, conn);
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cmd.CommandTimeout = 20;
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System.Data.OleDb.OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
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adapter.Fill(ds, "tempTable");
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conn.Close();
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}
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catch (Exception e)
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{
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ds = null;
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}
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return ds;
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}
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/// <summary>
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/// 根据SQL查询返回DataSet对象，如果没有查询到则返回NULL
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/// </summary>
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/// <param name="sql">查询语句</param>
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/// <param name="sRecord">开始记录数</param>
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/// <param name="mRecord">最大记录数</param>
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/// <returns>DataSet</returns>
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public DataSet GetDataSet(string sql, int sRecord, int mRecord)
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{
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DataSet ds = new DataSet();
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try
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{
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OleDbCommand cmd = new OleDbCommand(sql, conn);
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cmd.CommandTimeout = 20;
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System.Data.OleDb.OleDbDataAdapter adapter = new OleDbDataAdapter(cmd);
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adapter.Fill(ds, sRecord, mRecord, "tempTable");
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}
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catch (Exception e)
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{
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ds = null;
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}
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return ds;
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}
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/// <summary>
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/// 对数据库的增，删，改的操作
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/// </summary>
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/// <param name="sql">SQL语句</param>
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/// <returns>是否成功</returns>
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public bool ExecuteDataBase(string sql)
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{
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bool succeed = false;
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int cnt = 0;
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try
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{
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OleDbCommand cmd = new OleDbCommand(sql, conn);
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cmd.CommandTimeout = 20;
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if (this.Open())
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cnt = cmd.ExecuteNonQuery();
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}
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catch (Exception e)
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{
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e.ToString();
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}
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finally
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{
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if (cnt > 0)
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{
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succeed = true;
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}
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}
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return succeed;
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}
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/// <summary>
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/// 获得该SQL查询返回的第一行第一列的值，如果没有查询到则返回NULL
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/// </summary>
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/// <param name="sql">查询语句</param>
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/// <returns>返回的第一行第一列的值</returns>
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public string GetScalar(string sql)
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{
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string str = null;
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try
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{
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OleDbCommand cmd = new OleDbCommand(sql, conn);
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if (this.Open())
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str = cmd.ExecuteScalar().ToString();
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}
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catch (Exception e)
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{
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e.ToString();
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}
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return str;
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}
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/// <summary>
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/// 获得该SQL查询返回DataTable，如果没有查询到则返回NULL
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/// </summary>
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/// <param name="sql">查询语句</param>
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/// <returns></returns>
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public DataTable GetDataTable(string sql)
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{
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DataTable tb = null;
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DataSet ds = this.GetDataSet(sql);
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if (ds != null)
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{
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tb = ds.Tables["tempTable"];
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}
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return tb;
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}
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/// <summary>
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/// 打开数据库连接.
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/// </summary>
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private bool Open()
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{
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bool succeed = false;
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try
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{
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if (conn.State == System.Data.ConnectionState.Closed)
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{
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conn.Open();
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succeed = true;
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}
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else if (conn.State == System.Data.ConnectionState.Broken)
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{
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conn.Close();
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conn.Open();
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succeed = true;
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}
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else if (conn.State == System.Data.ConnectionState.Open)
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{
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succeed = true;
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}
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}
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catch (Exception e)
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{
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e.ToString();
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}
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return succeed;
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}
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/// <summary>
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/// 关闭数据库连接
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/// </summary>
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public void Close()
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{
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if (conn != null)
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{
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conn.Close();
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}
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}
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/// <summary>
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/// 释放数据库连接资源
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/// </summary>
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public void Dispose()
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{
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if (conn != null)
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{
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conn.Dispose();
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conn = null;
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}
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}
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}
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}
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