asp.net开发sql server转换成oracle的方法详解_实用技巧_

 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.OracleClient; using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace TransplantSQL { public partial class Form1 : Form { public static string OracleConnectionString = System.Configuration.ConfigurationSettings.AppSettings["OracleConnectionString"]; public static string SqlServerConnectionString = System.Configuration.ConfigurationSettings.AppSettings["SqlServerConnectionString"]; public Form1() { InitializeComponent(); } private void button2_Click(object sender, EventArgs e) { OracleConnection con = new OracleConnection(OracleConnectionString); try { con.Open(); if (con.State == System.Data.ConnectionState.Open) { label5.Text = "连接成功"; } } catch (OracleException se) { label5.Text = "连接失败"; } finally { con.Close(); } } private void button3_Click(object sender, EventArgs e) { SqlConnection con = new SqlConnection(SqlServerConnectionString); try { con.Open(); if (con.State == System.Data.ConnectionState.Open) { label4.Text = "连接成功"; } } catch (SqlException se) { label4.Text = "连接失败"; } finally { con.Close(); } } private void button1_Click(object sender, EventArgs e) { if (textBox1.Text == "") { DataTable tablenames = GetTableNames(); foreach (DataRow item in tablenames.Rows) { string tablename = item["Name"].ToString().ToUpper(); setdata(tablename); } } else { setdata(textBox1.Text); } label2.Text = "成功"; } private static void setdata(string tablename) { // 查找有没有此表 如果没有就加 int et = Convert.ToInt32(GetSingle("select count(*) from user_tables where table_name = '" + tablename + "'")); if (et <= 0) { DataTable tableInfo = GetTableInfo(tablename); string addtablesql = "CREATE TABLE {0}({1})"; string cs = string.Empty; string biaoshi = string.Empty; foreach (DataRow citem in tableInfo.Rows) { cs += citem["字段名"].ToString(); if (citem["类型"].ToString() == "int" || citem["类型"].ToString() == "bit" || citem["类型"].ToString() == "decimal") { cs += " NUMBER(" + (Convert.ToInt32(citem["长度"]) > 38 ? 38 : Convert.ToInt32(citem["长度"])) + (Convert.ToInt32(citem["小数位数"])>0?(","+Convert.ToInt32(citem["小数位数"])):"") + ")"; } else if (citem["类型"].ToString() == "nvarchar" || citem["类型"].ToString() == "float") { cs += " VARCHAR2(" + (Convert.ToInt32(citem["长度"]) == -1 ? 4000 : Convert.ToInt32(citem["长度"]) * 2) + ")"; } else if (citem["类型"].ToString() == "datetime") { cs += " DATE"; } cs += citem["主键"].ToString() == "1" ? " primary key " : ""; if (citem["标识"].ToString() == "1") { biaoshi = citem["字段名"].ToString(); } cs += citem["默认值"].ToString() != "" ? " default " + citem["默认值"].ToString() + " " : ""; cs += citem["允许空"].ToString() == "1" ? "," : " NOT NULL,"; } cs = cs.Substring(0, cs.Length - 1); string tempsql = string.Format(addtablesql, tablename, cs); GetSingle(tempsql); if (biaoshi != string.Empty) { #region 判断是否有序列号 没有就创建 就是自动标识 int xuliehao = 0; try { xuliehao = Convert.ToInt32(GetSingle(string.Format(@"select Seq_{0}.nextval from sys.dual", tablename))); } catch { } if (xuliehao <= 0) { #region 为了让序列不重复 取最大值为min 值 int max = Convert.ToInt32(GetSingle(string.Format("select max({1}) from {0}", tablename, biaoshi),null)); #endregion string sequence = string.Format(@"create sequence Seq_{0} start with {1} increment by 1 nomaxvalue minvalue 1 nocycle nocache", tablename, (max+1));//创建标识 GetSingle(sequence); } #endregion #region 创建序列的触发器 string chufaqisql = string.Format(@"CREATE OR REPLACE TRIGGER T_{0} BEFORE INSERT ON {0} FOR EACH ROW WHEN (new.{1} is null) begin select Seq_{0}.nextval into:new.{1} from dual; end;", tablename, biaoshi);//创建触发器 GetSingle(chufaqisql); #endregion #region 创建唯一约束 //string weiyisql = string.Format(@"create unique index U_{0} on {0} ({1})", tablename, biaoshi); //GetSingle(weiyisql); #endregion } //int count = Convert.ToInt32(GetSingle("SELECT count(1) FROM " + tablename)); //if (count < 10000) //{ DataSet ds = Query("SELECT * FROM " + tablename); DataTable dt = ds.Tables[0]; string columnsNames = string.Empty; string values = string.Empty; for (int i = 0; i < dt.Columns.Count; i++) { columnsNames += dt.Columns[i].ColumnName + ","; } columnsNames = columnsNames.Substring(0, columnsNames.Length - 1); foreach (DataRow dr in dt.Rows) { values = string.Empty; for (int i = 0; i < dt.Columns.Count; i++) { if (dr[i] != DBNull.Value) { if (dr[i].ToString() != "") { if (dt.Columns[i].DataType == Type.GetType("System.Double") || dt.Columns[i].DataType == Type.GetType("System.Decimal") || dt.Columns[i].DataType == Type.GetType("System.Int32")) { values += dr[i] + ","; } else if (dt.Columns[i].DataType == Type.GetType("System.String")) { values += "'" + dr[i].ToString().Replace('\'', '‘') + "',"; } else if (dt.Columns[i].DataType == Type.GetType("System.DateTime")) { values += "to_date('" + dr[i] + "','YYYY/MM/DD HH24:MI:SS'),"; } else if (dt.Columns[i].DataType == Type.GetType("System.Boolean")) { if (dr[i].ToString() == "False") { values += "0,"; } else { values += "1,"; } } } else { values += "chr(32),"; } } else { values += "NULL,"; } } values = values.Substring(0, values.Length - 1); string osql = "Insert into " + tablename + "(" + columnsNames + ") values(" + values + ")"; GetSingle(osql); } //} } } private static DataTable GetTableNames() { string sql = string.Format(@"SELECT Name FROM SysObjects Where XType='U' ORDER BY Name"); DataSet ds = Query(sql); return ds.Tables[0]; } private static DataTable GetTableInfo(string tableName) { string sql = string.Format(@"SELECT (case when a.colorder=1 then d.name else null end) 表名, a.colorder 字段序号,a.name 字段名, (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '1'else '' end) 标识, (case when (SELECT count(*) FROM sysobjects WHERE (name in (SELECT name FROM sysindexes WHERE (id = a.id) AND (indid in (SELECT indid FROM sysindexkeys WHERE (id = a.id) AND (colid in (SELECT colid FROM syscolumns WHERE (id = a.id) AND (name = a.name))))))) AND (xtype = 'PK'))>0 then '1' else '' end) 主键,b.name 类型,a.length 占用字节数, COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度, isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,(case when a.isnullable=1 then '1'else '' end) 允许空, REPLACE(REPLACE(isnull(e.text,''),'(',''),')','') 默认值,isnull(g.[value], ' ') AS [说明] FROM syscolumns a left join systypes b on a.xtype=b.xusertype inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties' left join syscomments e on a.cdefault=e.id left join sys.extended_properties g on a.id=g.major_id AND a.colid=g.minor_id left join sys.extended_properties f on d.id=f.class and f.minor_id=0 where b.name is not null And d.name='{0}' order by a.id,a.colorder", tableName); DataSet ds = Query(sql); return ds.Tables[0]; } public static DataSet Query(string SQLString) { using (SqlConnection connection = new SqlConnection(SqlServerConnectionString)) { DataSet ds = new DataSet(); try { connection.Open(); SqlDataAdapter command = new SqlDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (System.Data.SqlClient.SqlException ex) { throw new Exception(ex.Message); } return ds; } } public static object GetSingle(string SQLString) { using (OracleConnection connection = new OracleConnection(OracleConnectionString)) { using (OracleCommand cmd = new OracleCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, null); 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 e; } } } } 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 parameter in cmdParms) { if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null)) { parameter.Value = DBNull.Value; } cmd.Parameters.Add(parameter); } } } public static object GetSingle(string SQLString, params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(SqlServerConnectionString)) { using (SqlCommand cmd = new SqlCommand()) { 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 (System.Data.SqlClien
                
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