HSQLDB example source code file (TransferSQLText.java)

This example HSQLDB source code file (TransferSQLText.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - HSQLDB tags/keywords

dataaccesspointexception, dataaccesspointexception, io, ioexception, ioexception, jdbc, nosuchelementexception, nse, sql, string, string, stringtokenizer, token, token, tokenizer, util, vector, wtextread

The HSQLDB TransferSQLText.java source code

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;
import java.util.Vector;

/**
 * @author Nicolas BAZIN, INGENICO
 * @version 1.7.0
 */
class TransferSQLText extends DataAccessPoint {

    String              sFileName              = null;
    BufferedWriter      WTextWrite             = null;
    BufferedReader      WTextRead              = null;
    protected boolean   StructureAlreadyParsed = false;
    Hashtable           DbStmts                = null;
    protected JDBCTypes JDBCT                  = null;

    TransferSQLText(String _FileName,
                    Traceable t) throws DataAccessPointException {

        super(t);

        sFileName = _FileName;
        JDBCT     = new JDBCTypes();

        if (sFileName == null) {
            throw new DataAccessPointException("File name not initialized");
        }
    }

    boolean execute(String statement) throws DataAccessPointException {

        if (WTextWrite == null) {
            try {
                WTextWrite = new BufferedWriter(new FileWriter(sFileName));
            } catch (IOException e) {
                throw new DataAccessPointException(e.getMessage());
            }
        }

        try {
            WTextWrite.write(statement + "\n");
            WTextWrite.flush();
        } catch (IOException e) {
            throw new DataAccessPointException(e.getMessage());
        }

        return true;
    }

    void putData(String statement, TransferResultSet r,
                 int iMaxRows) throws DataAccessPointException {

        int i = 0;

        if (r == null) {
            return;
        }

        if (WTextWrite == null) {
            try {
                WTextWrite = new BufferedWriter(new FileWriter(sFileName));
            } catch (IOException e) {
                throw new DataAccessPointException(e.getMessage());
            }
        }

        try {
            while (r.next()) {
                if (i == 0) {
                    WTextWrite.write(statement + "\n");
                    WTextWrite.flush();
                }

                transferRow(r);

                if (iMaxRows != 0 && i == iMaxRows) {
                    break;
                }

                i++;

                if (iMaxRows != 0 || i % 100 == 0) {
                    tracer.trace("Transfered " + i + " rows");
                }
            }
        } catch (Exception e) {
            throw new DataAccessPointException(e.getMessage());
        } finally {
            try {
                if (i > 0) {
                    WTextWrite.write("\tNumber of Rows=" + i + "\n\n");
                    WTextWrite.flush();
                }
            } catch (IOException e) {
                throw new DataAccessPointException(e.getMessage());
            }
        }
    }

    void close() throws DataAccessPointException {

        if (WTextWrite != null) {
            try {
                WTextWrite.flush();
                WTextWrite.close();
            } catch (IOException e) {}
        }
    }

    /**
     * Method declaration
     *
     *
     * @param type
     * @param r
     * @param p
     *
     * @throws SQLException
     */
    private void transferRow(TransferResultSet r) throws Exception {

        String sLast = "";
        int    len   = r.getColumnCount();

        if (WTextWrite == null) {
            try {
                WTextWrite = new BufferedWriter(new FileWriter(sFileName));
            } catch (IOException e) {
                throw new DataAccessPointException(e.getMessage());
            }
        }

        for (int i = 0; i < len; i++) {
            int t = r.getColumnType(i + 1);

            sLast = "column=" + r.getColumnName(i + 1) + " datatype="
                    + (String) helper.getSupportedTypes().get(new Integer(t));

            Object o = r.getObject(i + 1);

            if (o == null) {
                sLast += " value=<null>";
            } else {
                o     = helper.convertColumnValue(o, i + 1, t);
                sLast += " value=\'" + o.toString() + "\'";
            }

            WTextWrite.write("\t" + sLast + "\n");
            WTextWrite.flush();
        }

        WTextWrite.write("\n");
        WTextWrite.flush();

        sLast = "";
    }

    class ColumnDef {

        String columnName;
        String columnType;
        String options;
        int    start;
        int    len;

        public ColumnDef() {

            columnName = "";
            columnType = "";
            options    = "";
            start      = 0;
            len        = 0;
        }
    }

    ColumnDef getColumnDef(String ColumnsDesc, int curPos) {

        int       nextPos   = 0;
        ColumnDef columnDef = new TransferSQLText.ColumnDef();

        columnDef.start = curPos;

        if ((ColumnsDesc == null) || (ColumnsDesc.length() == 0)
                || (curPos >= ColumnsDesc.length())) {
            return new TransferSQLText.ColumnDef();
        }

        String stbuff = ColumnsDesc.substring(curPos);

        try {
            int i = 0;

            for (; i < stbuff.length(); i++) {
                int c = stbuff.charAt(i);

                if (c == ',' || c == ' ' || c == ')' || c == ';') {
                    continue;
                } else {
                    break;
                }
            }

            if (i == stbuff.length()) {
                return new TransferSQLText.ColumnDef();
            }

            columnDef.len += i;
            stbuff        = stbuff.substring(i);

            while (stbuff.charAt(nextPos) != ' ') {
                nextPos++;
            }

            columnDef.columnName = stbuff.substring(0, nextPos);
            stbuff               = stbuff.substring(nextPos);
            columnDef.len        += nextPos;
            nextPos              = 0;

            if (!columnDef.columnName.toUpperCase().equals("CONSTRAINT")) {
                i = 0;

                for (; i < stbuff.length() && stbuff.charAt(i) == ' '; i++) {}

                stbuff        = stbuff.substring(i);
                columnDef.len += i;

                while ((stbuff.charAt(nextPos) != '(')
                        && (stbuff.charAt(nextPos) != ',')
                        && (stbuff.charAt(nextPos) != ')')
                        && (stbuff.charAt(nextPos) != ';')
                        && (stbuff.charAt(nextPos) != ' ')) {
                    nextPos++;
                }

                columnDef.columnType = stbuff.substring(0,
                        nextPos).toUpperCase();
                stbuff        = stbuff.substring(nextPos);
                columnDef.len += nextPos;
                nextPos       = 0;
            }

            while ((stbuff.charAt(nextPos) != ',')
                    && (stbuff.charAt(nextPos) != ';')
                    && (nextPos < stbuff.length())
                    && (stbuff.charAt(nextPos) != ')')) {
                if (stbuff.charAt(nextPos) == '(') {
                    while (stbuff.charAt(nextPos) != ')') {
                        nextPos++;
                    }
                }

                nextPos++;
            }

            columnDef.options = stbuff.substring(0, nextPos);
            columnDef.len     += nextPos;
        } catch (Exception e) {
            columnDef = new TransferSQLText.ColumnDef();
        }

        return columnDef;
    }

    String translateTypes(String CreateLine, TransferTable TTable,
                          DataAccessPoint Dest)
                          throws DataAccessPointException {

        String    translatedLine = "";
        JDBCTypes JDBCT          = new JDBCTypes();
        int       currentPos     = 0;
        String    columnName     = "";
        String    columnType     = "";
        int       colnum         = 0;
        ColumnDef cDef;

        currentPos     = CreateLine.indexOf('(') + 1;
        translatedLine = CreateLine.substring(0, currentPos);

        do {
            cDef = getColumnDef(CreateLine, currentPos);

            if (cDef.len == 0) {
                break;
            }

            columnName = cDef.columnName;
            columnType = cDef.columnType;

            if (columnName.toUpperCase().indexOf("CONSTRAINT") >= 0) {
                translatedLine +=
                    CreateLine.substring(currentPos, currentPos + cDef.len)
                    + ",";
                currentPos += cDef.len + 1;

                colnum++;

                continue;
            }

            columnName = Dest.helper.formatIdentifier(columnName) + " ";

            try {
                Integer inttype = new Integer(
                    Dest.helper.convertToType(JDBCT.toInt(columnType)));

                columnType = (String) TTable.hTypes.get(inttype);
            } catch (Exception JDBCtypeEx) {}

            if (cDef.options != null) {
                columnType += cDef.options;
            }

            try {
                columnType = Dest.helper.fixupColumnDefWrite(TTable, null,
                        columnType, null, colnum);
            } catch (SQLException SQLe) {
                return CreateLine;
            }

            translatedLine += columnName + " " + columnType + ",";
            currentPos     += cDef.len + 1;

            colnum++;
        } while (true);

        return translatedLine.substring(0, translatedLine.length() - 1)
               + ");";
    }

    void parseFileForTables() throws DataAccessPointException {

        StringTokenizer Tokenizer;

        if (WTextRead == null) {
            try {
                WTextRead = new BufferedReader(new FileReader(sFileName));
            } catch (IOException e) {
                throw new DataAccessPointException(e.getMessage());
            }
        }

        String        currentLine  = "";
        String        Token        = "";
        String        name         = "";
        TransferTable relatedTable = null;

        try {
            while ((currentLine = WTextRead.readLine()) != null) {
                currentLine = currentLine.trim() + ";";
                Tokenizer   = new StringTokenizer(currentLine);

                try {
                    Token = Tokenizer.nextToken();
                } catch (NoSuchElementException NSE) {
                    continue;
                }

                if (Token == null) {
                    continue;
                }

                if (!Token.toUpperCase().equals("CREATE")) {
                    continue;
                }

                Token = Tokenizer.nextToken().toUpperCase();

                if (Token.equals("TABLE") || Token.equals("VIEW")) {
                    try {
                        name = Tokenizer.nextToken(" (;");
                        relatedTable = new TransferTable(this, name, "",
                                                         Token, tracer);
                        relatedTable.Stmts.bCreate      = false;
                        relatedTable.Stmts.bDelete      = false;
                        relatedTable.Stmts.bDrop        = false;
                        relatedTable.Stmts.bCreateIndex = false;
                        relatedTable.Stmts.bDropIndex   = false;
                        relatedTable.Stmts.bInsert      = false;
                        relatedTable.Stmts.bAlter       = false;

                        DbStmts.put(relatedTable.Stmts.sSourceTable,
                                    relatedTable);
                    } catch (NoSuchElementException NSE) {
                        continue;
                    }
                }
            }
        } catch (Exception IOe) {
            throw new DataAccessPointException(IOe.getMessage());
        }
    }

    void parseFileForTheRest(TransferTable TTable,
                             DataAccessPoint Dest)
                             throws DataAccessPointException {

        StringTokenizer Tokenizer;

        StructureAlreadyParsed = true;

        if (WTextRead == null) {
            try {
                WTextRead = new BufferedReader(new FileReader(sFileName));
            } catch (IOException e) {
                throw new DataAccessPointException(e.getMessage());
            }
        }

        String        currentLine  = "";
        String        Token        = "";
        String        name         = "";
        TransferTable relatedTable = null;

        try {
            while ((currentLine = WTextRead.readLine()) != null) {
                currentLine = currentLine.trim() + ";";
                Tokenizer   = new StringTokenizer(currentLine);

                try {
                    Token = Tokenizer.nextToken();
                } catch (NoSuchElementException NSE) {
                    continue;
                }

                if (Token == null) {
                    continue;
                }

                if (Token.toUpperCase().equals("INSERT")) {
                    try {
                        if (!Tokenizer.nextToken().toUpperCase().equals(
                                "INTO")) {
                            throw new DataAccessPointException(
                                "Error in INSERT statement: no INTO found");
                        }

                        Token = Tokenizer.nextToken();

                        if ((relatedTable =
                                (TransferTable) DbStmts.get(Token)) != null) {
                            relatedTable.Stmts.bDelete     = true;
                            relatedTable.Stmts.bInsert     = true;
                            relatedTable.Stmts.sDestInsert = currentLine;
                            relatedTable.Stmts.sDestDelete =
                                "DELETE FROM "
                                + relatedTable.Stmts.sSourceTable + ";";
                        }

                        continue;
                    } catch (NoSuchElementException NSE) {
                        continue;
                    }
                } else if (Token.toUpperCase().equals("ALTER")) {
                    try {
                        if (!Tokenizer.nextToken().toUpperCase().equals(
                                "TABLE")) {
                            continue;
                        }

                        name  = Tokenizer.nextToken();
                        Token = Tokenizer.nextToken().toUpperCase();

                        if (!Token.equals("ADD")) {
                            continue;
                        }

                        do {
                            Token = Tokenizer.nextToken().toUpperCase();
                        } while (!Token.equals("CONSTRAINT"));

                        if ((relatedTable = (TransferTable) DbStmts.get(name))
                                != null) {
                            if (relatedTable.Stmts.sDestAlter == null) {
                                relatedTable.Stmts.sDestAlter = "";
                            }

                            relatedTable.Stmts.bAlter     = true;
                            relatedTable.Stmts.sDestAlter += currentLine;
                        } else {
                            throw new DataAccessPointException(
                                "table not found");
                        }

                        Token = Tokenizer.nextToken();

                        if (relatedTable.Stmts.sDestDrop == null) {
                            relatedTable.Stmts.sDestDrop = "";
                        }

                        relatedTable.Stmts.bDrop = true;
                        relatedTable.Stmts.sDestDrop =
                            "ALTER TABLE " + name + " DROP CONSTRAINT "
                            + Token + ";" + relatedTable.Stmts.sDestDrop;

                        continue;
                    } catch (NoSuchElementException NSE) {
                        continue;
                    }
                } else if (!Token.toUpperCase().equals("CREATE")) {
                    continue;
                }

                Token = Tokenizer.nextToken().toUpperCase();

                if (Token.equals("TABLE") || Token.equals("VIEW")) {
                    try {
                        name = Tokenizer.nextToken(" (;");

                        if (!DbStmts.containsKey(name)) {
                            throw new DataAccessPointException(
                                "error: index is created before the table");
                        }

                        relatedTable = (TransferTable) DbStmts.get(name);
                        relatedTable.Stmts.bCreate = true;
                        relatedTable.Stmts.bDrop   = true;

//                        relatedTable.Stmts.sDestCreate = currentLine;
                        relatedTable.Stmts.sDestCreate =
                            translateTypes(currentLine, TTable, Dest);
                        relatedTable.Stmts.sDestDrop =
                            "DROP " + relatedTable.Stmts.sType + " " + name
                            + ";";

                        DbStmts.put(relatedTable.Stmts.sSourceTable,
                                    relatedTable);
                    } catch (NoSuchElementException NSE) {
                        continue;
                    }
                }

                if (Token.equals("INDEX") || Token.equals("UNIQUE")) {
                    try {
                        while ((Token =
                                Tokenizer.nextToken()).toUpperCase().equals(
                                    "INDEX")) {
                            ;
                        }

                        String IndexdropCommand = "DROP INDEX " + Token
                                                  + " ;";

                        while ((Token = Tokenizer.nextToken(
                                " (")).toUpperCase().equals("ON")) {
                            ;
                        }

                        name = Token;

                        if (!DbStmts.containsKey(Token)) {
                            throw new DataAccessPointException(
                                "error: index is created before the table");
                        }

                        relatedTable = (TransferTable) DbStmts.get(Token);

                        if (relatedTable.Stmts.sDestCreateIndex == null) {
                            relatedTable.Stmts.sDestCreateIndex = "";
                        }

                        if (relatedTable.Stmts.sDestDropIndex == null) {
                            relatedTable.Stmts.sDestDropIndex = "";
                        }

                        relatedTable.Stmts.bCreateIndex     = true;
                        relatedTable.Stmts.bDropIndex       = true;
                        relatedTable.Stmts.sDestCreateIndex += currentLine;
                        relatedTable.Stmts.sDestDropIndex += IndexdropCommand;
                    } catch (NoSuchElementException NSE) {
                        continue;
                    }
                }
            }
        } catch (IOException IOe) {
            throw new DataAccessPointException(IOe.getMessage());
        }
    }

    Vector getTables(String sCatalog,
                     String[] sSchemas) throws DataAccessPointException {

        Vector AllTables = new Vector();

        if (DbStmts == null) {
            DbStmts = new Hashtable();
        }

        if (WTextRead != null) {
            try {
                WTextRead.close();

                WTextRead = null;
            } catch (IOException e) {}
        }

        this.parseFileForTables();

        StructureAlreadyParsed = false;

        Enumeration e = DbStmts.elements();

        while (e.hasMoreElements()) {
            AllTables.addElement(e.nextElement());
        }

        return AllTables;
    }

    void getTableStructure(TransferTable TTable,
                           DataAccessPoint Dest)
                           throws DataAccessPointException {

        if (!StructureAlreadyParsed) {
            if (WTextRead != null) {
                try {
                    WTextRead.close();

                    WTextRead = null;
                } catch (IOException e) {}
            }

            this.parseFileForTheRest(TTable, Dest);
        }
    }

    TransferResultSet getData(String statement)
    throws DataAccessPointException {

        StringTokenizer Tokenizer;
        String          tableName = "";

        try {
            Tokenizer = new StringTokenizer(statement);

            while (!Tokenizer.nextToken().toUpperCase().equals("FROM")) {
                ;
            }

            tableName = Tokenizer.nextToken(" ;");
        } catch (NoSuchElementException NSE) {
            throw new DataAccessPointException(
                "Table name not found in statement: " + statement);
        }

        if (WTextRead != null) {
            try {
                WTextRead.close();

                WTextRead = null;
            } catch (IOException e) {}
        }

        return (this.parseFileForData(tableName));
    }

    TransferResultSet parseFileForData(String tableName)
    throws DataAccessPointException {

        TransferResultSet trsData = new TransferResultSet();
        StringTokenizer   Tokenizer;

        if (WTextRead == null) {
            try {
                WTextRead = new BufferedReader(new FileReader(sFileName));
            } catch (IOException e) {
                throw new DataAccessPointException(e.getMessage());
            }
        }

        String currentLine = "";
        String Token;

        try {
            while ((currentLine = WTextRead.readLine()) != null) {
                currentLine = currentLine.trim() + ";";
                Tokenizer   = new StringTokenizer(currentLine);

                try {
                    Token = Tokenizer.nextToken();
                } catch (NoSuchElementException NSE) {
                    continue;
                }

                if (Token == null) {
                    continue;
                }

                if (!Token.toUpperCase().equals("INSERT")) {
                    continue;
                }

                try {
                    if (!Tokenizer.nextToken().toUpperCase().equals("INTO")) {
                        throw new DataAccessPointException(
                            "Error in INSERT statement: no INTO found");
                    }

                    Token = Tokenizer.nextToken();

                    if (!Token.equals(tableName)) {
                        continue;
                    }

                    int    iParsedRows   = 0;
                    Vector vColumnNames  = new Vector();
                    Vector vColumnValues = new Vector();
                    Vector vColumnTypes  = new Vector();

                    while ((currentLine = WTextRead.readLine()) != null) {
                        currentLine = currentLine.trim();

                        boolean newLine = (currentLine.length() == 0);

                        if (newLine) {
                            int iColumnNb = 0;

                            iParsedRows++;

                            iColumnNb = vColumnNames.size();

                            String[] Names  = new String[iColumnNb + 1];
                            int[]    Types  = new int[iColumnNb + 1];
                            Object[] Values = new Object[iColumnNb + 1];

                            for (int Idx = 0; Idx < iColumnNb; Idx++) {
                                Names[Idx + 1] =
                                    (String) vColumnNames.elementAt(Idx);
                                Types[Idx + 1] =
                                    ((Integer) vColumnTypes.elementAt(
                                        Idx)).intValue();
                                Values[Idx + 1] =
                                    vColumnValues.elementAt(Idx);
                            }

                            try {
                                trsData.addRow(Names, Types, Values,
                                               iColumnNb);
                            } catch (Exception e) {
                                throw new DataAccessPointException(
                                    e.getMessage());
                            }

                            iColumnNb = 0;

                            vColumnNames.removeAllElements();
                            vColumnValues.removeAllElements();
                            vColumnTypes.removeAllElements();

                            continue;
                        }

                        Tokenizer = new StringTokenizer(currentLine);
                        Token     = Tokenizer.nextToken("=");

                        if (Token.equals("Number of Rows")) {
                            int iNbRows =
                                Integer.parseInt(Tokenizer.nextToken());

                            if (iNbRows != iParsedRows) {
                                throw new DataAccessPointException(
                                    "Number of parsed rows (" + iParsedRows
                                    + ") is different from the expected ("
                                    + iNbRows + ")");
                            }

                            return trsData;
                        }

                        if (Token.equals("column")) {
                            Token = Tokenizer.nextToken(" =");

                            vColumnNames.addElement(Token);
                        }

                        Token = Tokenizer.nextToken(" =");

                        if (Token.equals("datatype")) {
                            int iType;

                            Token = Tokenizer.nextToken(" =");

                            try {
                                iType = JDBCT.toInt(Token.toUpperCase());
                            } catch (Exception e) {
                                throw new DataAccessPointException(
                                    "Unknown type: " + Token);
                            }

                            vColumnTypes.addElement(new Integer(iType));
                        }

                        Token = Tokenizer.nextToken(" =");

                        if (Token.equals("value")) {
                            int iStart = currentLine.indexOf("value=") + 6;
                            String sValue =
                                currentLine.substring(iStart).trim();

                            if (sValue.indexOf("<null>") >= 0) {
                                vColumnValues.addElement(null);
                            } else {
                                int    i       = sValue.indexOf('\'') + 1;
                                String sbToken = sValue.substring(i);

                                i       = sbToken.lastIndexOf('\'');
                                sbToken = sbToken.substring(0, i);
                                Token   = sbToken;

                                vColumnValues.addElement(Token);
                            }
                        }
                    }
                } catch (IndexOutOfBoundsException IOBe) {
                    continue;
                }
            }
        } catch (IOException IOe) {
            throw new DataAccessPointException(IOe.getMessage());
        }

        return trsData;
    }
}