statementwrapper.java

在资料浩瀚的互联网中

/*
      Copyright (C) 2002-2004 MySQL AB

      This program is free software; you can redistribute it and/or modify
      it under the terms of version 2 of the GNU General Public License as 
      published by the Free Software Foundation.

      There are special exceptions to the terms and conditions of the GPL 
      as it is applied to this software. View the full text of the 
      exception in file EXCEPTIONS-CONNECTOR-J in the directory of this 
      software distribution.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software
      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



 */
package com.mysql.jdbc.jdbc2.optional;

import com.mysql.jdbc.SQLError;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;


/**
 * Wraps statements so that errors can be reported correctly to
 * ConnectionEventListeners.
 *
 * @author Mark Matthews
 *
 * @version $Id: StatementWrapper.java,v 1.1.4.5 2004/12/15 21:59:49 mmatthew Exp $
 */
class StatementWrapper extends WrapperBase implements Statement {
    protected Statement wrappedStmt;
    protected ConnectionWrapper wrappedConn;
    
    protected StatementWrapper(ConnectionWrapper c, MysqlPooledConnection conn, Statement toWrap) {
        this.pooledConnection = conn;
        this.wrappedStmt = toWrap;
        this.wrappedConn = c;
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getConnection()
     */
    public Connection getConnection() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedConn;
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return null; // we actually never get here, but the compiler can't figure 

        // that out
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#setCursorName(java.lang.String)
     */
    public void setCursorName(String name) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                this.wrappedStmt.setCursorName(name);
            } else {
                throw new SQLException("Statement already closed",
                    SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
            }
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#setEscapeProcessing(boolean)
     */
    public void setEscapeProcessing(boolean enable) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                this.wrappedStmt.setEscapeProcessing(enable);
            } else {
                throw new SQLException("Statement already closed",
                    SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
            }
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#setFetchDirection(int)
     */
    public void setFetchDirection(int direction) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                this.wrappedStmt.setFetchDirection(direction);
            } else {
                throw new SQLException("Statement already closed",
                    SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
            }
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getFetchDirection()
     */
    public int getFetchDirection() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getFetchDirection();
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return ResultSet.FETCH_FORWARD; // we actually never get here, but the compiler can't figure 

        // that out
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#setFetchSize(int)
     */
    public void setFetchSize(int rows) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                this.wrappedStmt.setFetchSize(rows);
            } else {
                throw new SQLException("Statement already closed",
                    SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
            }
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getFetchSize()
     */
    public int getFetchSize() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getFetchSize();
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return 0; // we actually never get here, but the compiler can't figure 

        // that out
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getGeneratedKeys()
     */
    public ResultSet getGeneratedKeys() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getGeneratedKeys();
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return null; // we actually never get here, but the compiler can't figure 

        // that out
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#setMaxFieldSize(int)
     */
    public void setMaxFieldSize(int max) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                this.wrappedStmt.setMaxFieldSize(max);
            } else {
                throw new SQLException("Statement already closed",
                    SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
            }
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getMaxFieldSize()
     */
    public int getMaxFieldSize() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getMaxFieldSize();
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return 0; // we actually never get here, but the compiler can't figure 

        // that out
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#setMaxRows(int)
     */
    public void setMaxRows(int max) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                this.wrappedStmt.setMaxRows(max);
            } else {
                throw new SQLException("Statement already closed",
                    SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
            }
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getMaxRows()
     */
    public int getMaxRows() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getMaxRows();
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return 0; // we actually never get here, but the compiler can't figure 

        // that out
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getMoreResults()
     */
    public boolean getMoreResults() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getMoreResults();
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return false;
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getMoreResults(int)
     */
    public boolean getMoreResults(int current) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getMoreResults(current);
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return false;
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#setQueryTimeout(int)
     */
    public void setQueryTimeout(int seconds) throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                this.wrappedStmt.setQueryTimeout(seconds);
            } else {
                throw new SQLException("Statement already closed",
                    SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
            }
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getQueryTimeout()
     */
    public int getQueryTimeout() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                return this.wrappedStmt.getQueryTimeout();
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return 0;
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getResultSet()
     */
    public ResultSet getResultSet() throws SQLException {
        try {
            if (this.wrappedStmt != null) {
                ResultSet rs = this.wrappedStmt.getResultSet();
                
                ((com.mysql.jdbc.ResultSet)rs).setWrapperStatement(this);
            	
            	return rs;
            }

            throw new SQLException("Statement already closed",
                SQLError.SQL_STATE_ILLEGAL_ARGUMENT);
        } catch (SQLException sqlEx) {
            checkAndFireConnectionError(sqlEx);
        }

        return null;
    }

    /* (non-Javadoc)
     * @see java.sql.Statement#getResultSetConcurrency()
     */
    public int getResultSetConcurrency() throws SQLException {