[815] | 1 | using System;
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| 2 | using System.Data;
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| 3 | using System.Globalization;
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| 4 |
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| 5 | namespace IndianHealthService.BMXNet
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| 6 | {
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| 7 | public class BMXNetDataReader : IDataReader
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| 8 | {
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| 9 | // The DataReader should always be open when returned to the user.
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| 10 | private bool m_fOpen = true;
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| 11 |
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| 12 | // Keep track of the results and position
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| 13 | // within the resultset (starts prior to first record).
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| 14 | private RPMSDb.RPMSDbResultSet m_resultset;
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| 15 | private static int m_STARTPOS = -1;
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| 16 | private int m_nPos = m_STARTPOS;
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| 17 |
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| 18 | /*
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| 19 | * Keep track of the connection in order to implement the
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| 20 | * CommandBehavior.CloseConnection flag. A null reference means
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| 21 | * normal behavior (do not automatically close).
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| 22 | */
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| 23 | private BMXNetConnection m_connection = null;
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| 24 |
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| 25 | /*
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| 26 | * Because the user should not be able to directly create a
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| 27 | * DataReader object, the constructors are
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| 28 | * marked as internal.
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| 29 | */
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| 30 | internal BMXNetDataReader(RPMSDb.RPMSDbResultSet resultset)
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| 31 | {
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| 32 | m_resultset = resultset;
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| 33 | }
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| 34 |
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| 35 | internal BMXNetDataReader(RPMSDb.RPMSDbResultSet resultset, BMXNetConnection connection)
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| 36 | {
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| 37 | m_resultset = resultset;
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| 38 | m_connection = connection;
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| 39 | }
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| 40 |
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| 41 | /****
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| 42 | * METHODS / PROPERTIES FROM IDataReader.
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| 43 | ****/
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| 44 | public int Depth
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| 45 | {
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| 46 | /*
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| 47 | * Always return a value of zero if nesting is not supported.
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| 48 | */
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| 49 | get { return 0; }
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| 50 | }
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| 51 |
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| 52 | public bool IsClosed
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| 53 | {
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| 54 | /*
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| 55 | * Keep track of the reader state - some methods should be
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| 56 | * disallowed if the reader is closed.
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| 57 | */
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| 58 | get { return !m_fOpen; }
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| 59 | }
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| 60 |
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| 61 | public int RecordsAffected
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| 62 | {
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| 63 | /*
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| 64 | * RecordsAffected is only applicable to batch statements
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| 65 | * that include inserts/updates/deletes. BMXNet always
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| 66 | * returns -1.
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| 67 | */
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| 68 | get { return -1; }
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| 69 | }
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| 70 |
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| 71 | public void Close()
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| 72 | {
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| 73 | /*
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| 74 | * Close the reader. BMXNet only changes the state,
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| 75 | * but an actual implementation would also clean up any
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| 76 | * resources used by the operation. For example,
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| 77 | * cleaning up any resources waiting for data to be
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| 78 | * returned by the server.
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| 79 | */
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| 80 | m_fOpen = false;
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| 81 | }
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| 82 |
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| 83 | public bool NextResult()
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| 84 | {
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| 85 | // BMXNet only returns a single resultset. However,
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| 86 | // DbDataAdapter expects NextResult to return a value.
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| 87 | return false;
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| 88 | }
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| 89 |
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| 90 | public bool Read()
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| 91 | {
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| 92 | // Return true if it is possible to advance and if you are still positioned
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| 93 | // on a valid row. Because the data array in the resultset
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| 94 | // is two-dimensional, you must divide by the number of columns.
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| 95 | if (++m_nPos >= m_resultset.data.Length / m_resultset.metaData.Length)
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| 96 | return false;
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| 97 | else
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| 98 | return true;
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| 99 | }
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| 100 |
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| 101 | public DataTable GetSchemaTable()
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| 102 | {
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| 103 | DataTable dtSchema = new DataTable();
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| 104 |
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| 105 | dtSchema.Columns.Add("ColumnName", typeof(System.String));
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| 106 | dtSchema.Columns.Add("ColumnSize", typeof(Int32));
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| 107 | dtSchema.Columns.Add("ColumnOrdinal", typeof(Int32));
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| 108 | dtSchema.Columns.Add("NumericPrecision", typeof(Int16));
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| 109 | dtSchema.Columns.Add("NumericScale", typeof(Int16));
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| 110 | dtSchema.Columns.Add("DataType", typeof(System.Type));
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| 111 | dtSchema.Columns.Add("AllowDBNull", typeof(bool));
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| 112 | dtSchema.Columns.Add("IsReadOnly", typeof(bool));
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| 113 | dtSchema.Columns.Add("IsUnique", typeof(bool));
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| 114 | dtSchema.Columns.Add("IsRowVersion", typeof(bool));
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| 115 | dtSchema.Columns.Add("IsKey", typeof(bool));
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| 116 | dtSchema.Columns.Add("IsAutoIncrement", typeof(bool));
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| 117 | dtSchema.Columns.Add("IsLong", typeof(bool));
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| 118 | dtSchema.Columns.Add("BaseTableName", typeof(System.String));
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| 119 | dtSchema.Columns.Add("BaseColumnName", typeof(System.String));
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| 120 |
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| 121 | dtSchema.ExtendedProperties.Add("BMXTable", m_resultset.fmFileID);
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| 122 | dtSchema.ExtendedProperties.Add("BMXKey", m_resultset.fmKeyField);
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| 123 |
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| 124 | for (int i=0; i < m_resultset.metaData.GetLength(0); i++)
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| 125 | {
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| 126 | DataRow r = dtSchema.NewRow();
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| 127 | r["BaseTableName"] = m_resultset.fmFileID;
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| 128 | r["BaseColumnName"] = m_resultset.metaData[i].fmFieldID;
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| 129 | r["ColumnName"] = m_resultset.metaData[i].name;
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| 130 | r["ColumnSize"] = m_resultset.metaData[i].maxSize;
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| 131 | r["ColumnOrdinal"] = i;
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| 132 | r["NumericPrecision"] = 0;
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| 133 | r["NumericScale"] = 0;
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| 134 | r["DataType"] = m_resultset.metaData[i].type;
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| 135 | r["AllowDBNull"] = false;
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| 136 | r["IsReadOnly"] = m_resultset.metaData[i].fmReadOnly;
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| 137 | r["IsUnique"] = false;
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| 138 | if (m_resultset.metaData[i].name == "BMXIEN")
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| 139 | r["IsUnique"] = true;
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| 140 | r["IsRowVersion"] = false;
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| 141 | r["IsKey"] = m_resultset.metaData[i].fmKeyField;
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| 142 | r["IsAutoIncrement"] = false;
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| 143 | r["IsLong"] = false;
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| 144 |
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| 145 | dtSchema.Rows.Add(r);
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| 146 | }
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| 147 | return dtSchema;
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| 148 | }
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| 149 |
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| 150 | /****
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| 151 | * METHODS / PROPERTIES FROM IDataRecord.
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| 152 | ****/
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| 153 | public int FieldCount
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| 154 | {
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| 155 | // Return the count of the number of columns, which in
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| 156 | // this case is the size of the column metadata
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| 157 | // array.
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| 158 | get { return m_resultset.metaData.Length; }
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| 159 | }
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| 160 |
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| 161 | public String GetName(int i)
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| 162 | {
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| 163 | return m_resultset.metaData[i].name;
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| 164 | }
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| 165 |
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| 166 | public String GetDataTypeName(int i)
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| 167 | {
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| 168 | /*
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| 169 | * Usually this would return the name of the type
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| 170 | * as used on the back end, for example 'smallint' or 'varchar'.
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| 171 | * BMXNet returns the simple name of the .NET Framework type.
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| 172 | */
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| 173 | return m_resultset.metaData[i].type.Name;
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| 174 | }
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| 175 |
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| 176 | public Type GetFieldType(int i)
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| 177 | {
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| 178 | // Return the actual Type class for the data type.
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| 179 | return m_resultset.metaData[i].type;
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| 180 | }
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| 181 |
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| 182 | public Object GetValue(int i)
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| 183 | {
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| 184 | return m_resultset.data[m_nPos, i];
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| 185 | }
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| 186 |
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| 187 | public int GetValues(object[] values)
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| 188 | {
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| 189 | int i = 0, j = 0;
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| 190 | for ( ; i < values.Length && j < m_resultset.metaData.Length; i++, j++)
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| 191 | {
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| 192 | values[i] = m_resultset.data[m_nPos, j];
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| 193 | }
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| 194 |
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| 195 | return i;
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| 196 | }
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| 197 |
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| 198 | public int GetOrdinal(string name)
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| 199 | {
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| 200 | // Look for the ordinal of the column with the same name and return it.
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| 201 | for (int i = 0; i < m_resultset.metaData.Length; i++)
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| 202 | {
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| 203 | if (0 == _cultureAwareCompare(name, m_resultset.metaData[i].name))
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| 204 | {
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| 205 | return i;
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| 206 | }
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| 207 | }
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| 208 |
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| 209 | // Throw an exception if the ordinal cannot be found.
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| 210 | throw new IndexOutOfRangeException("Could not find specified column in results");
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| 211 | }
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| 212 |
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| 213 | public object this [ int i ]
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| 214 | {
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| 215 | get { return m_resultset.data[m_nPos, i]; }
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| 216 | }
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| 217 |
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| 218 | public object this [ String name ]
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| 219 | {
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| 220 | // Look up the ordinal and return
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| 221 | // the value at that position.
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| 222 | get { return this[GetOrdinal(name)]; }
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| 223 | }
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| 224 |
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| 225 | public bool GetBoolean(int i)
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| 226 | {
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| 227 | /*
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| 228 | * Force the cast to return the type. InvalidCastException
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| 229 | * should be thrown if the data is not already of the correct type.
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| 230 | */
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| 231 | return (bool)m_resultset.data[m_nPos, i];
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| 232 | }
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| 233 |
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| 234 | public byte GetByte(int i)
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| 235 | {
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| 236 | /*
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| 237 | * Force the cast to return the type. InvalidCastException
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| 238 | * should be thrown if the data is not already of the correct type.
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| 239 | */
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| 240 | return (byte)m_resultset.data[m_nPos, i];
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| 241 | }
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| 242 |
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| 243 | public long GetBytes(int i, long fieldOffset, byte[] buffer, int bufferoffset, int length)
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| 244 | {
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| 245 | // BMXNet does not support this method.
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| 246 | throw new NotSupportedException("GetBytes not supported.");
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| 247 | }
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| 248 |
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| 249 | public char GetChar(int i)
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| 250 | {
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| 251 | /*
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| 252 | * Force the cast to return the type. InvalidCastException
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| 253 | * should be thrown if the data is not already of the correct type.
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| 254 | */
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| 255 | return (char)m_resultset.data[m_nPos, i];
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| 256 | }
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| 257 |
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| 258 | public long GetChars(int i, long fieldoffset, char[] buffer, int bufferoffset, int length)
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| 259 | {
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| 260 | // BMXNet does not support this method.
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| 261 | throw new NotSupportedException("GetChars not supported.");
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| 262 | }
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| 263 |
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| 264 | public Guid GetGuid(int i)
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| 265 | {
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| 266 | /*
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| 267 | * Force the cast to return the type. InvalidCastException
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| 268 | * should be thrown if the data is not already of the correct type.
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| 269 | */
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| 270 | return (Guid)m_resultset.data[m_nPos, i];
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| 271 | }
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| 272 |
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| 273 | public Int16 GetInt16(int i)
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| 274 | {
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| 275 | /*
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| 276 | * Force the cast to return the type. InvalidCastException
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| 277 | * should be thrown if the data is not already of the correct type.
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| 278 | */
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| 279 | return (Int16)m_resultset.data[m_nPos, i];
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| 280 | }
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| 281 |
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| 282 | public Int32 GetInt32(int i)
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| 283 | {
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| 284 | /*
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| 285 | * Force the cast to return the type. InvalidCastException
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| 286 | * should be thrown if the data is not already of the correct type.
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| 287 | */
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| 288 | return (Int32)m_resultset.data[m_nPos, i];
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| 289 | }
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| 290 |
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| 291 | public Int64 GetInt64(int i)
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| 292 | {
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| 293 | /*
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| 294 | * Force the cast to return the type. InvalidCastException
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| 295 | * should be thrown if the data is not already of the correct type.
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| 296 | */
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| 297 | return (Int64)m_resultset.data[m_nPos, i];
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| 298 | }
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| 299 |
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| 300 | public float GetFloat(int i)
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| 301 | {
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| 302 | /*
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| 303 | * Force the cast to return the type. InvalidCastException
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| 304 | * should be thrown if the data is not already of the correct type.
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| 305 | */
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| 306 | return (float)m_resultset.data[m_nPos, i];
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| 307 | }
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| 308 |
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| 309 | public double GetDouble(int i)
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| 310 | {
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| 311 | /*
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| 312 | * Force the cast to return the type. InvalidCastException
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| 313 | * should be thrown if the data is not already of the correct type.
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| 314 | */
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| 315 | return (double)m_resultset.data[m_nPos, i];
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| 316 | }
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| 317 |
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| 318 | public String GetString(int i)
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| 319 | {
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| 320 | /*
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| 321 | * Force the cast to return the type. InvalidCastException
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| 322 | * should be thrown if the data is not already of the correct type.
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| 323 | */
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| 324 | return (String)m_resultset.data[m_nPos, i];
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| 325 | }
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| 326 |
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| 327 | public Decimal GetDecimal(int i)
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| 328 | {
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| 329 | /*
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| 330 | * Force the cast to return the type. InvalidCastException
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| 331 | * should be thrown if the data is not already of the correct type.
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| 332 | */
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| 333 | return (Decimal)m_resultset.data[m_nPos, i];
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| 334 | }
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| 335 |
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| 336 | public DateTime GetDateTime(int i)
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| 337 | {
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| 338 | /*
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| 339 | * Force the cast to return the type. InvalidCastException
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| 340 | * should be thrown if the data is not already of the correct type.
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| 341 | */
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| 342 | return (DateTime)m_resultset.data[m_nPos, i];
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| 343 | }
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| 344 |
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| 345 | public IDataReader GetData(int i)
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| 346 | {
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| 347 | /*
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| 348 | * BMXNet code does not support this method. Need,
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| 349 | * to implement this in order to expose nested tables and
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| 350 | * other hierarchical data.
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| 351 | */
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| 352 | throw new NotSupportedException("GetData not supported.");
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| 353 | }
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| 354 |
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| 355 | public bool IsDBNull(int i)
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| 356 | {
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| 357 | return m_resultset.data[m_nPos, i] == DBNull.Value;
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| 358 | }
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| 359 |
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| 360 | /*
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| 361 | * Implementation specific methods.
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| 362 | */
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| 363 | private int _cultureAwareCompare(string strA, string strB)
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| 364 | {
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| 365 | return CultureInfo.CurrentCulture.CompareInfo.Compare(strA, strB, CompareOptions.IgnoreKanaType | CompareOptions.IgnoreWidth | CompareOptions.IgnoreCase);
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| 366 | }
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| 367 |
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| 368 | void IDisposable.Dispose()
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| 369 | {
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| 370 | this.Dispose(true);
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| 371 | System.GC.SuppressFinalize(this);
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| 372 | }
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| 373 |
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| 374 | private void Dispose(bool disposing)
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| 375 | {
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| 376 | if (disposing)
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| 377 | {
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| 378 | try
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| 379 | {
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| 380 | this.Close();
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| 381 | }
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| 382 | catch (Exception e)
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| 383 | {
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| 384 | throw new SystemException("An exception of type " + e.GetType() +
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| 385 | " was encountered while closing the BMXNetDataReader.");
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| 386 | }
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| 387 | }
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| 388 | }
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| 389 |
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| 390 | }
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| 391 | }
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