随笔:
(1) 命名空间
using System.Data.OleDb;
(2) 连接字符串
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private staticstring connStr = @"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb" ; |
注意:
a、DataSource = 数据库存放的路径(这里数据库放到了D盘目录下)
b、 2003版本的Access数据库链接字符串:
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privatestatic stringconnStr = @"Provider = Microsoft.Jet.OLEDB.4.0;DataSource = d:\login.mdb" ; 2007版本的Access数据库链接字符串:privatestaticstring connStr = @"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb" ; |
(3) 建立连接:
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OleDbConnection tempconn = new OleDbConnection(connStr); |
(4) 使用OleDbCommand类来执行Sql语句:
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OleDbCommand cmd = new OleDbCommand(sql, tempconn); tempconn.Open(); cmd.ExecuteNonQuery(); |
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.OleDb; using System.Windows.Forms; using System.Data; namespace test { class AccessHelper { private static string connStr = @"Provider = Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb" ; public static OleDbConnection GetConn() { OleDbConnection tempconn = new OleDbConnection(connStr); MessageBox.Show(tempconn.DataSource); tempconn.Open(); MessageBox.Show(tempconn.State.ToString()); return (tempconn); } /// <summary> /// 执行增加、删除、修改指令 /// </summary> /// <param name="sql">增加、删除、修改的sql语句</param> /// <param name="param">sql语句的参数</param> /// <returns></returns> public static int ExecuteNonQuery( string sql, params OleDbParameter[] param) { using (OleDbConnection conn = new OleDbConnection(connStr)) { using (OleDbCommand cmd = new OleDbCommand(sql,conn)) { if (param != null ) { cmd.Parameters.AddRange(param); } conn.Open(); return (cmd.ExecuteNonQuery()); } } } /// <summary> /// 执行查询指令,获取返回的首行首列的值 /// </summary> /// <param name="sql">查询sql语句</param> /// <param name="param">sql语句的参数</param> /// <returns></returns> public static object ExecuteScalar( string sql, params OleDbParameter[] param) { using (OleDbConnection conn = new OleDbConnection(connStr)) { using (OleDbCommand cmd = new OleDbCommand(sql, conn)) { if (param != null ) { cmd.Parameters.AddRange(param); } conn.Open(); return (cmd.ExecuteScalar()); } } } /// <summary> /// 执行查询指令,获取返回的datareader /// </summary> /// <param name="sql">查询sql语句</param> /// <param name="param">sql语句的参数</param> /// <returns></returns> public static OleDbDataReader ExecuteReader( string sql, params OleDbParameter[] param) { OleDbConnection conn = new OleDbConnection(connStr); OleDbCommand cmd = conn.CreateCommand(); cmd.CommandText = sql; cmd.CommandType = CommandType.Text; if (param != null ) { cmd.Parameters.AddRange(param); } conn.Open(); return (cmd.ExecuteReader(CommandBehavior.CloseConnection)); } /// <summary> /// 执行查询指令,获取返回datatable /// </summary> /// <param name="sql">查询sql语句</param> /// <param name="param">sql语句的参数</param> /// <returns></returns> public static DataTable ExecuteDatable( string sql, params OleDbParameter[] param) { using (OleDbConnection conn = new OleDbConnection(connStr)) { using (OleDbCommand cmd = new OleDbCommand(sql, conn)) { if (param != null ) { cmd.Parameters.AddRange(param); } DataTable dt = new DataTable(); OleDbDataAdapter sda = new OleDbDataAdapter(cmd); sda.Fill(dt); return (dt); } } } } } |
总结
以上所述是小编给大家介绍的C# 操作 access 数据库的实例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:https://www.cnblogs.com/lsy131479/archive/2018/03/26/8650515.html