118 lines
3.3 KiB
C#
118 lines
3.3 KiB
C#
// testclob.cs - tests loading a text file into an oracle clob and vice-versa
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using System;
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using System.Data;
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using System.Data.OracleClient;
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using System.Text;
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using System.IO;
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class TestClob
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{
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static string infilename = @"cs-parser.cs";
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static string outfilename = @"cs-parser2.cs";
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static string connectionString = "data source=palis;user id=scott;password=tiger"
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public static void Main (string[] args)
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{
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OracleConnection con = new OracleConnection();
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con.ConnectionString = connectionString;
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con.Open();
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CLOBTest (con);
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ReadClob (con);
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con.Close();
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con = null;
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}
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// read the CLOB into file "cs-parser2.cs"
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public static void ReadClob (OracleConnection connection)
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{
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OracleCommand rcmd = connection.CreateCommand ();
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rcmd.CommandText = "SELECT CLOB_COLUMN FROM CLOBTEST";
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OracleDataReader reader2 = rcmd.ExecuteReader ();
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if (!reader2.Read ())
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Console.WriteLine ("ERROR: RECORD NOT FOUND");
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Console.WriteLine (" TESTING OracleLob OBJECT 2...");
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OracleLob lob2 = reader2.GetOracleLob (0);
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Console.WriteLine (" LENGTH: {0}", lob2.Length);
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Console.WriteLine (" CHUNK SIZE: {0}", lob2.ChunkSize);
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string lobvalue = (string) lob2.Value;
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using (StreamWriter sw = new StreamWriter(outfilename)) {
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sw.Write(lobvalue);
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}
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lob2.Close ();
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reader2.Close ();
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}
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public static void CLOBTest (OracleConnection connection)
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{
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Console.WriteLine (" BEGIN TRANSACTION ...");
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OracleTransaction transaction = connection.BeginTransaction ();
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Console.WriteLine (" Drop table CLOBTEST ...");
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try {
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OracleCommand cmd2 = connection.CreateCommand ();
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cmd2.Transaction = transaction;
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cmd2.CommandText = "DROP TABLE CLOBTEST";
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cmd2.ExecuteNonQuery ();
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}
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catch (OracleException oe1) {
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// ignore if table already exists
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}
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Console.WriteLine (" CREATE TABLE ...");
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OracleCommand create = connection.CreateCommand ();
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create.Transaction = transaction;
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create.CommandText = "CREATE TABLE CLOBTEST (CLOB_COLUMN CLOB)";
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create.ExecuteNonQuery ();
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Console.WriteLine (" INSERT RECORD ...");
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OracleCommand insert = connection.CreateCommand ();
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insert.Transaction = transaction;
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insert.CommandText = "INSERT INTO CLOBTEST VALUES (EMPTY_CLOB())";
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insert.ExecuteNonQuery ();
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OracleCommand select = connection.CreateCommand ();
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select.Transaction = transaction;
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select.CommandText = "SELECT CLOB_COLUMN FROM CLOBTEST FOR UPDATE";
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Console.WriteLine (" SELECTING A CLOB (CHARACTER) VALUE FROM CLOBTEST");
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OracleDataReader reader = select.ExecuteReader ();
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if (!reader.Read ())
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Console.WriteLine ("ERROR: RECORD NOT FOUND");
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Console.WriteLine (" TESTING OracleLob OBJECT ...");
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OracleLob lob = reader.GetOracleLob (0);
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Console.WriteLine (" LENGTH: {0}", lob.Length);
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Console.WriteLine (" CHUNK SIZE: {0}", lob.ChunkSize);
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UnicodeEncoding encoding = new UnicodeEncoding ();
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try {
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// read file "cs-parser.cs" into the oracle clob
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using (StreamReader sr = new StreamReader(infilename)) {
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string sbuff = sr.ReadToEnd ();
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byte[] evalue = encoding.GetBytes (sbuff);
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lob.Write (evalue, 0, evalue.Length);
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}
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}
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catch (Exception e) {
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Console.WriteLine("The file could not be read:");
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Console.WriteLine(e.Message);
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}
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lob.Close ();
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Console.WriteLine (" CLOSING READER...");
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reader.Close ();
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transaction.Commit ();
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}
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} |