Types.NULL : Types « java.sql « Java by API





Types.NULL

 
/*
 Copyright 2003 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 Use of this software is authorized pursuant to the terms of the license found at
 http://developer.java.sun.com/berkeley_license.html.

 Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.  
 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met: 

 - Redistribution of source code must retain the above copyright notice, 
 this list of conditions and the following disclaimer.

 - Redistribution 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 Sun Microsystems, Inc. or the names of contributors may 
 be used to endorse or promote products derived from this software without
 specific prior written permission.

 This software is provided "AS IS," without a warranty of any kind.  
 ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MICORSYSTEMS, INC. ("SUN")
 AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, 
 INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
 LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN
 IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

 You acknowledge that this software is not designed, licensed or intended for
 use in the design, construction, operation or maintenance of any nuclear
 facility.


 */

/*
 * Copyright 2003 Sun Microsystems, Inc.  ALL RIGHTS RESERVED.
 * Use of this software is authorized pursuant to the terms of the license found at
 * http://developer.java.sun.com/berkeley_license.html.
 */

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.Vector;

public class Main {

  public static void main(String[] args) {
    String url = "jdbc:mySubprotocol:myDataSource";

    Connection con;
    Statement stmt;
    try {
      Class.forName("myDriver.ClassName");

    } catch (java.lang.ClassNotFoundException e) {
      System.err.print("ClassNotFoundException: ");
      System.err.println(e.getMessage());
    }

    try {
      con = DriverManager.getConnection(url, "myLogin", "myPassword");

      stmt = con.createStatement();

      Vector dataTypes = getDataTypes(con);

      String tableName;
      String columnName;
      String sqlType;
      String prompt = "Enter the new table name and hit Return: ";
      tableName = getInput(prompt);
      String createTableString = "create table " + tableName + " (";

      String commaAndSpace = ", ";
      boolean firstTime = true;
      while (true) {
        System.out.println("");
        prompt = "Enter a column name " + "(or nothing when finished) \nand hit Return: ";
        columnName = getInput(prompt);
        if (firstTime) {
          if (columnName.length() == 0) {
            System.out.print("Need at least one column;");
            System.out.println(" please try again");
            continue;
          } else {
            createTableString += columnName + " ";
            firstTime = false;
          }
        } else if (columnName.length() == 0) {
          break;
        } else {
          createTableString += commaAndSpace + columnName + " ";
        }

        String localTypeName = null;
        String paramString = "";
        while (true) {
          System.out.println("");
          System.out.println("LIST OF TYPES YOU MAY USE:  ");
          boolean firstPrinted = true;
          int length = 0;
          for (int i = 0; i < dataTypes.size(); i++) {
            DataType dataType = (DataType) dataTypes.get(i);
            if (!dataType.needsToBeSet()) {
              if (!firstPrinted)
                System.out.print(commaAndSpace);
              else
                firstPrinted = false;
              System.out.print(dataType.getSQLType());
              length += dataType.getSQLType().length();
              if (length > 50) {
                System.out.println("");
                length = 0;
                firstPrinted = true;
              }
            }
          }
          System.out.println("");

          int index;
          prompt = "Enter a column type " + "from the list and hit Return:  ";
          sqlType = getInput(prompt);
          for (index = 0; index < dataTypes.size(); index++) {
            DataType dataType = (DataType) dataTypes.get(index);
            if (dataType.getSQLType().equalsIgnoreCase(sqlType) && !dataType.needsToBeSet()) {
              break;
            }
          }

          localTypeName = null;
          paramString = "";
          if (index < dataTypes.size()) { // there was a match
            String params;
            DataType dataType = (DataType) dataTypes.get(index);
            params = dataType.getParams();
            localTypeName = dataType.getLocalType();
            if (params != null) {
              prompt = "Enter " + params + ":  ";
              paramString = "(" + getInput(prompt) + ")";
            }
            break;
          } else { // use the name as given
            prompt = "Are you sure?  " + "Enter 'y' or 'n' and hit Return:  ";
            String check = getInput(prompt) + " ";
            check = check.toLowerCase().substring(0, 1);
            if (check.equals("n"))
              continue;
            else {
              localTypeName = sqlType;
              break;
            }
          }
        }

        createTableString += localTypeName + paramString;

      }

      createTableString += ")";
      System.out.println("");
      System.out.print("Your CREATE TABLE statement as ");
      System.out.println("sent to your DBMS:  ");
      System.out.println(createTableString);
      System.out.println("");

      stmt.executeUpdate(createTableString);

      stmt.close();
      con.close();

    } catch (SQLException ex) {
      System.err.println("SQLException: " + ex.getMessage());
    }
  }

  private static Vector getDataTypes(Connection con) throws SQLException {
    String structName = null, distinctName = null, javaName = null;

    // create a vector of class DataType initialized with
    // the SQL code, the SQL type name, and two null entries
    // for the local type name and the creation parameter(s)

    Vector dataTypes = new Vector();
    dataTypes.add(new DataType(java.sql.Types.BIT, "BIT"));
    dataTypes.add(new DataType(java.sql.Types.TINYINT, "TINYINT"));
    dataTypes.add(new DataType(java.sql.Types.SMALLINT, "SMALLINT"));
    dataTypes.add(new DataType(java.sql.Types.INTEGER, "INTEGER"));
    dataTypes.add(new DataType(java.sql.Types.BIGINT, "BIGINT"));
    dataTypes.add(new DataType(java.sql.Types.FLOAT, "FLOAT"));
    dataTypes.add(new DataType(java.sql.Types.REAL, "REAL"));
    dataTypes.add(new DataType(java.sql.Types.DOUBLE, "DOUBLE"));
    dataTypes.add(new DataType(java.sql.Types.NUMERIC, "NUMERIC"));
    dataTypes.add(new DataType(java.sql.Types.DECIMAL, "DECIMAL"));
    dataTypes.add(new DataType(java.sql.Types.CHAR, "CHAR"));
    dataTypes.add(new DataType(java.sql.Types.VARCHAR, "VARCHAR"));
    dataTypes.add(new DataType(java.sql.Types.LONGVARCHAR, "LONGVARCHAR"));
    dataTypes.add(new DataType(java.sql.Types.DATE, "DATE"));
    dataTypes.add(new DataType(java.sql.Types.TIME, "TIME"));
    dataTypes.add(new DataType(java.sql.Types.TIMESTAMP, "TIMESTAMP"));
    dataTypes.add(new DataType(java.sql.Types.BINARY, "BINARY"));
    dataTypes.add(new DataType(java.sql.Types.VARBINARY, "VARBINARY"));
    dataTypes.add(new DataType(java.sql.Types.LONGVARBINARY, "LONGVARBINARY"));
    dataTypes.add(new DataType(java.sql.Types.NULL, "NULL"));
    dataTypes.add(new DataType(java.sql.Types.OTHER, "OTHER"));
    dataTypes.add(new DataType(java.sql.Types.BLOB, "BLOB"));
    dataTypes.add(new DataType(java.sql.Types.CLOB, "CLOB"));

    DatabaseMetaData dbmd = con.getMetaData();
    ResultSet rs = dbmd.getTypeInfo();
    while (rs.next()) {
      int codeNumber = rs.getInt("DATA_TYPE");
      String dbmsName = rs.getString("TYPE_NAME");
      String createParams = rs.getString("CREATE_PARAMS");

      if (codeNumber == Types.STRUCT && structName == null)
        structName = dbmsName;
      else if (codeNumber == Types.DISTINCT && distinctName == null)
        distinctName = dbmsName;
      else if (codeNumber == Types.JAVA_OBJECT && javaName == null)
        javaName = dbmsName;
      else {
        for (int i = 0; i < dataTypes.size(); i++) {
          // find entry that matches the SQL code,
          // and if local type and params are not already set,
          // set them
          DataType type = (DataType) dataTypes.get(i);
          if (type.getCode() == codeNumber) {
            type.setLocalTypeAndParams(dbmsName, createParams);
          }
        }
      }
    }

    int[] types = { Types.STRUCT, Types.DISTINCT, Types.JAVA_OBJECT };
    rs = dbmd.getUDTs(null, "%", "%", types);
    while (rs.next()) {
      String typeName = null;
      DataType dataType = null;

      if (dbmd.isCatalogAtStart())
        typeName = rs.getString(1) + dbmd.getCatalogSeparator() + rs.getString(2) + "."
            + rs.getString(3);
      else
        typeName = rs.getString(2) + "." + rs.getString(3) + dbmd.getCatalogSeparator()
            + rs.getString(1);

      switch (rs.getInt(5)) {
      case Types.STRUCT:
        dataType = new DataType(Types.STRUCT, typeName);
        dataType.setLocalTypeAndParams(structName, null);
        break;
      case Types.DISTINCT:
        dataType = new DataType(Types.DISTINCT, typeName);
        dataType.setLocalTypeAndParams(distinctName, null);
        break;
      case Types.JAVA_OBJECT:
        dataType = new DataType(Types.JAVA_OBJECT, typeName);
        dataType.setLocalTypeAndParams(javaName, null);
        break;
      }
      dataTypes.add(dataType);
    }

    return dataTypes;
  }

  private static String getInput(String prompt) throws SQLException {

    System.out.print(prompt);
    System.out.flush();

    try {
      java.io.BufferedReader bin;
      bin = new java.io.BufferedReader(new java.io.InputStreamReader(System.in));

      String result = bin.readLine();
      return result;

    } catch (java.io.IOException ex) {
      System.out.println("Caught java.io.IOException:");
      System.out.println(ex.getMessage());
      return "";
    }
  }
}

class DataType {

  private int code;

  private String SQLType;

  private String localType = null;

  private String params = null;

  private boolean needsSetting = true;

  public DataType(int code, String SQLType) {
    this.code = code;
    this.SQLType = SQLType;

  }

  public boolean needsToBeSet() {
    return needsSetting;
  }

  public int getCode() {
    return code;
  }

  public String getSQLType() {
    return SQLType;
  }

  public String getLocalType() {
    return localType;
  }

  public String getParams() {
    return params;
  }

  public void setLocalTypeAndParams(String local, String p) {
    if (needsSetting) {
      localType = local;
      params = p;
      needsSetting = false;
    }
  }
}

   
  










Related examples in the same category

1.Types.BIGINT
2.Types.BIT
3.Types.BLOB
4.Types.CLOB
5.Types.DECIMAL
6.Types.DATE
7.Types.DOUBLE
8.Types.FLOAT
9.Types.INTEGER
10.Types.LONGVARCHAR
11.Types.LONGVARBINARY
12.Types.TIMESTAMP
13.Types.VARBINARY
14.Types.VARCHAR