Attempt III

src/interfaces/jdbc/org/postgresql/ResultSet.java

@@ -0,0 +1,158 @@
+package org.postgresql;
+
+import java.lang.*;
+import java.io.*;
+import java.math.*;
+import java.text.*;
+import java.util.*;
+import java.sql.*;
+import org.postgresql.largeobject.*;
+import org.postgresql.util.*;
+
+/**
+ * This class implements the common internal methods used by both JDBC 1 and
+ * JDBC 2 specifications.
+ */
+public abstract class ResultSet
+{
+  protected Vector rows;			// The results
+  protected Field fields[];		// The field descriptions
+  protected String status;		// Status of the result
+  protected int updateCount;		// How many rows did we get back?
+  protected int current_row;		// Our pointer to where we are at
+  protected byte[][] this_row;		// the current row result
+  protected Connection connection;	// the connection which we returned from
+  protected SQLWarning warnings = null;	// The warning chain
+  protected boolean wasNullFlag = false;	// the flag for wasNull()
+  
+  //  We can chain multiple resultSets together - this points to
+  // next resultSet in the chain.
+  protected ResultSet next = null;
+  
+  /**
+   * Create a new ResultSet - Note that we create ResultSets to
+   * represent the results of everything.
+   *
+   * @param fields an array of Field objects (basically, the
+   *	ResultSet MetaData)
+   * @param tuples Vector of the actual data
+   * @param status the status string returned from the back end
+   * @param updateCount the number of rows affected by the operation
+   * @param cursor the positioned update/delete cursor name
+   */
+  public ResultSet(Connection conn, Field[] fields, Vector tuples, String status, int updateCount)
+  {
+    this.connection = conn;
+    this.fields = fields;
+    this.rows = tuples;
+    this.status = status;
+    this.updateCount = updateCount;
+    this.this_row = null;
+    this.current_row = -1;
+  }
+    
+  /**
+   * We at times need to know if the resultSet we are working
+   * with is the result of an UPDATE, DELETE or INSERT (in which
+   * case, we only have a row count), or of a SELECT operation
+   * (in which case, we have multiple fields) - this routine
+   * tells us.
+   *
+   * @return true if we have tuples available
+   */
+  public boolean reallyResultSet()
+  {
+    return (fields != null);
+  }
+  
+  /**
+   * Since ResultSets can be chained, we need some method of
+   * finding the next one in the chain.  The method getNext()
+   * returns the next one in the chain.
+   *
+   * @return the next ResultSet, or null if there are none
+   */
+  public java.sql.ResultSet getNext()
+  {
+    return (java.sql.ResultSet)next;
+  }
+  
+  /**
+   * This following method allows us to add a ResultSet object
+   * to the end of the current chain.
+   *
+   * @param r the resultset to add to the end of the chain.
+   */
+  public void append(ResultSet r)
+  {
+    if (next == null)
+      next = r;
+    else
+      next.append(r);
+  }
+  
+  /**
+   * If we are just a place holder for results, we still need
+   * to get an updateCount.  This method returns it.
+   *
+   * @return the updateCount
+   */
+  public int getResultCount()
+  {
+    return updateCount;
+  }
+  
+  /**
+   * We also need to provide a couple of auxiliary functions for
+   * the implementation of the ResultMetaData functions.  In
+   * particular, we need to know the number of rows and the
+   * number of columns.  Rows are also known as Tuples
+   *
+   * @return the number of rows
+   */
+  public int getTupleCount()
+  {
+    return rows.size();
+  }
+  
+  /**
+   * getColumnCount returns the number of columns
+   *
+   * @return the number of columns
+   */
+  public int getColumnCount()
+  {
+    return fields.length;
+  }
+   
+   /**
+    * Returns the status message from the backend.<p>
+    * It is used internally by the driver.
+    *
+    * @return the status string from the backend
+    */
+   public String getStatusString()
+   {
+     return status;
+   }
+   
+   /**
+    * returns the OID of a field.<p>
+    * It is used internally by the driver.
+    *
+    * @param field field id
+    * @return the oid of that field's type
+    */
+   public int getColumnOID(int field)
+   {
+     return fields[field-1].getOID();
+   }
+  
+    /**
+     * This is part of the JDBC API, but is required by org.postgresql.Field
+     */
+    public abstract void close() throws SQLException;
+    public abstract boolean next() throws SQLException;
+    public abstract String getString(int i) throws SQLException;
+}
+