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//
// Test/SqlDataRead.cs
//
// Test to do read a simple forward read only record set.
// Using SqlCommand.ExecuteReader() to return a SqlDataReader
// which can be used to Read a row
// and Get a String or Int32.
//
// Author:
// Daniel Morgan <danmorg@sc.rr.com>
//
// (C) 2002 Daniel Morgan
//
using System;
using System.Data;
using System.Data.SqlClient;
namespace TestSystemDataSqlClient {
class TestSqlDataReader {
static void Test(SqlConnection con, string sql,
CommandType cmdType, CommandBehavior behavior,
string testDesc)
{
SqlCommand cmd = null;
SqlDataReader rdr = null;
int c;
int results = 0;
Console.WriteLine("Test: " + testDesc);
Console.WriteLine("[BEGIN SQL]");
Console.WriteLine(sql);
Console.WriteLine("[END SQL]");
cmd = new SqlCommand(sql, con);
cmd.CommandType = cmdType;
Console.WriteLine("ExecuteReader...");
rdr = cmd.ExecuteReader(behavior);
if(rdr == null) {
Console.WriteLine("IDataReader has a Null Reference.");
}
else {
do {
// get the DataTable that holds
// the schema
DataTable dt = rdr.GetSchemaTable();
if(rdr.RecordsAffected != -1) {
// Results for
// SQL INSERT, UPDATE, DELETE Commands
// have RecordsAffected >= 0
Console.WriteLine("Result is from a SQL Command (INSERT,UPDATE,DELETE). Records Affected: " + rdr.RecordsAffected);
}
else if (dt == null)
Console.WriteLine("Result is from a SQL Command not (INSERT,UPDATE,DELETE). Records Affected: " + rdr.RecordsAffected);
else {
// Results for
// SQL not INSERT, UPDATE, nor DELETE
// have RecordsAffected = -1
Console.WriteLine("Result is from a SQL SELECT Query. Records Affected: " + rdr.RecordsAffected);
// Results for a SQL Command (CREATE TABLE, SET, etc)
// will have a null reference returned from GetSchemaTable()
//
// Results for a SQL SELECT Query
// will have a DataTable returned from GetSchemaTable()
results++;
Console.WriteLine("Result Set " + results + "...");
// number of columns in the table
Console.WriteLine(" Total Columns: " +
dt.Columns.Count);
// display the schema
foreach (DataRow schemaRow in dt.Rows) {
foreach (DataColumn schemaCol in dt.Columns)
Console.WriteLine(schemaCol.ColumnName +
" = " +
schemaRow[schemaCol]);
Console.WriteLine();
}
int nRows = 0;
string output, metadataValue, dataValue;
// Read and display the rows
Console.WriteLine("Gonna do a Read() now...");
while(rdr.Read()) {
Console.WriteLine(" Row " + nRows + ": ");
for(c = 0; c < rdr.FieldCount; c++) {
// column meta data
DataRow dr = dt.Rows[c];
metadataValue =
" Col " +
c + ": " +
dr["ColumnName"];
// column data
if(rdr.IsDBNull(c) == true)
dataValue = " is NULL";
else
dataValue =
": " +
rdr.GetValue(c);
// display column meta data and data
output = metadataValue + dataValue;
Console.WriteLine(output);
}
nRows++;
}
Console.WriteLine(" Total Rows: " +
nRows);
}
} while(rdr.NextResult());
Console.WriteLine("Total Result sets: " + results);
rdr.Close();
}
}
[STAThread]
static void Main(string[] args) {
String connectionString = null;
connectionString =
"host=localhost;" +
"dbname=test;" +
"user=postgres";
SqlConnection con;
con = new SqlConnection(connectionString);
con.Open();
string sql;
// Text - only has one query (single query behavior)
sql = "select * from pg_tables";
Test(con, sql, CommandType.Text,
CommandBehavior.SingleResult, "Text1");
// Text - only has one query (default behavior)
sql = "select * from pg_tables";
Test(con, sql, CommandType.Text,
CommandBehavior.Default, "Text2");
// Text - has three queries
sql =
"select * from pg_user;" +
"select * from pg_tables;" +
"select * from pg_database";
Test(con, sql, CommandType.Text,
CommandBehavior.Default, "Text3Queries");
// Table Direct
sql = "pg_tables";
Test(con, sql, CommandType.TableDirect,
CommandBehavior.Default, "TableDirect1");
// Stored Procedure
sql = "version";
Test(con, sql, CommandType.StoredProcedure,
CommandBehavior.Default, "SP1");
// Text - test a SQL Command (default behavior)
// Note: this not a SQL Query
sql = "SET DATESTYLE TO 'ISO'";
Test(con, sql, CommandType.Text,
CommandBehavior.Default, "TextCmd1");
con.Close();
}
}
}
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