Access 是Microsoft提供的小型的Databae，小型的程序还是需要它的，现在提供读取Access 常用的Function：
using System.Data.OleDb;
using System.Data;
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/// <summary> /// Description of DBUtil. /// </summary> public class AccessDBUtil { private static String connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=product.mdb"; private AccessDBUtil() { } //执行单条插入语句，并返回id，不需要返回id的用ExceuteNonQuery执行。 public static int ExecuteInsert(string sql,OleDbParameter[] parameters) { //Debug.WriteLine(sql); using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbCommand cmd = new OleDbCommand(sql, connection); try { connection.Open(); if(parameters!=null) cmd.Parameters.AddRange(parameters); cmd.ExecuteNonQuery(); cmd.CommandText = @"select @@identity"; int value = Int32.Parse(cmd.ExecuteScalar().ToString()); return value; } catch (Exception e) { throw e; } } } public static int ExecuteInsert(string sql) { return ExecuteInsert(sql,null); } //执行带参数的sql语句,返回影响的记录数（insert,update,delete) public static int ExecuteNonQuery(string sql,OleDbParameter[] parameters) { //Debug.WriteLine(sql); using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbCommand cmd = new OleDbCommand(sql, connection); try { connection.Open(); if(parameters!=null) cmd.Parameters.AddRange(parameters); int rows = cmd.ExecuteNonQuery(); return rows; } catch (Exception e) { throw e; } } } //执行不带参数的sql语句，返回影响的记录数 //不建议使用拼出来SQL public static int ExecuteNonQuery(string sql) { return ExecuteNonQuery(sql,null); } //执行单条语句返回第一行第一列,可以用来返回count(*) public static int ExecuteScalar(string sql,OleDbParameter[] parameters) { //Debug.WriteLine(sql); using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbCommand cmd = new OleDbCommand(sql, connection); try { connection.Open(); if(parameters!=null) cmd.Parameters.AddRange(parameters); int value = Int32.Parse(cmd.ExecuteScalar().ToString()); return value; } catch (Exception e) { throw e; } } } public static int ExecuteScalar(string sql) { return ExecuteScalar(sql,null); } //执行事务 public static void ExecuteTrans(List<string> sqlList,List<OleDbParameter[]> paraList) { //Debug.WriteLine(sql); using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbCommand cmd = new OleDbCommand(); OleDbTransaction transaction = null; cmd.Connection = connection; try { connection.Open(); transaction = connection.BeginTransaction(); cmd.Transaction = transaction; for(int i=0;i<sqlList.Count;i++) { cmd.CommandText=sqlList[i]; if(paraList!=null&¶List[i]!=null) { cmd.Parameters.Clear(); cmd.Parameters.AddRange(paraList[i]); } cmd.ExecuteNonQuery(); } transaction.Commit(); } catch (Exception e) { try {transaction.Rollback();} catch {} throw e; } } } public static void ExecuteTrans(List<string> sqlList) { ExecuteTrans(sqlList,null); } //执行查询语句，返回dataset public static DataSet ExecuteQuery(string sql,OleDbParameter[] parameters) { //Debug.WriteLine(sql); using (OleDbConnection connection = new OleDbConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); OleDbDataAdapter da = new OleDbDataAdapter(sql, connection); if(parameters!=null) da.SelectCommand.Parameters.AddRange(parameters); da.Fill(ds,"ds"); } catch (Exception ex) { throw ex; } return ds; } } public static DataSet ExecuteQuery(string sql) { return ExecuteQuery(sql,null); } //执行查询语句返回datareader，使用后要注意close //这个函数在AccessPageUtils中使用，执行其它查询时最好不要用 public static OleDbDataReader ExecuteReader(string sql) { //Debug.WriteLine(sql); OleDbConnection connection = new OleDbConnection(connectionString); OleDbCommand cmd = new OleDbCommand(sql, connection); try { connection.Open(); return cmd.ExecuteReader(CommandBehavior.CloseConnection); } catch (Exception e) { connection.Close(); throw e; } } } |
