| 1 | /* ============================================================= |
| 2 | * SmallSQL : a free Java DBMS library for the Java(tm) platform |
| 3 | * ============================================================= |
| 4 | * |
| 5 | * (C) Copyright 2004-2006, by Volker Berlin. |
| 6 | * |
| 7 | * Project Info: http://www.smallsql.de/ |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU Lesser General Public License as published by |
| 11 | * the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 17 | * License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| 22 | * USA. |
| 23 | * |
| 24 | * [Java is a trademark or registered trademark of Sun Microsystems, Inc. |
| 25 | * in the United States and other countries.] |
| 26 | * |
| 27 | * --------------- |
| 28 | * Column.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | */ |
| 33 | package smallsql.database; |
| 34 | |
| 35 | import java.io.*; |
| 36 | import java.sql.*; |
| 37 | |
| 38 | |
| 39 | public class Column implements Cloneable{ |
| 40 | |
| 41 | //private Expression value; |
| 42 | private Expression defaultValue = Expression.NULL; // Default value for INSERT |
| 43 | private String defaultDefinition; // String representation for Default Value |
| 44 | private String name; |
| 45 | //private String tableAlias; // für SELECT Syntax tableAlias.colName |
| 46 | //private String colName; // Name der Tabellenspalte |
| 47 | private boolean identity; |
| 48 | private boolean caseSensitive; |
| 49 | private boolean nullable = true; |
| 50 | private int scale; |
| 51 | private int precision; |
| 52 | private int dataType; |
| 53 | private Identity counter; // counter for identity values |
| 54 | |
| 55 | Column(){} |
| 56 | |
| 57 | |
| 58 | void setName( String name ){ |
| 59 | this.name = name; |
| 60 | } |
| 61 | |
| 62 | |
| 63 | void setDefaultValue(Expression defaultValue, String defaultDefinition){ |
| 64 | this.defaultValue = defaultValue; |
| 65 | this.defaultDefinition = defaultDefinition; |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Return the default expression for this column. If there is no default vale then it return Expression.NULL. |
| 70 | * @param con SSConnection for transactions |
| 71 | */ |
| 72 | Expression getDefaultValue(SSConnection con) throws SQLException{ |
| 73 | if(identity) |
| 74 | counter.createNextValue(con); |
| 75 | return defaultValue; |
| 76 | } |
| 77 | |
| 78 | String getDefaultDefinition(){ |
| 79 | return defaultDefinition; |
| 80 | } |
| 81 | |
| 82 | String getName(){ |
| 83 | return name; |
| 84 | } |
| 85 | |
| 86 | boolean isAutoIncrement(){ |
| 87 | return identity; |
| 88 | } |
| 89 | |
| 90 | void setAutoIncrement(boolean identity){ |
| 91 | this.identity = identity; |
| 92 | } |
| 93 | |
| 94 | int initAutoIncrement( Table table, RandomAccessFile raFile, long filePos) throws IOException{ |
| 95 | if(identity){ |
| 96 | counter = new Identity( table, raFile, filePos); |
| 97 | defaultValue = new ExpressionValue( counter, SQLTokenizer.BIGINT ); |
| 98 | } |
| 99 | return 8; |
| 100 | } |
| 101 | |
| 102 | void setNewAutoIncrementValue(Expression obj) throws Exception{ |
| 103 | if(identity){ |
| 104 | counter.setNextValue(obj); |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | boolean isCaseSensitive(){ |
| 109 | return caseSensitive; |
| 110 | } |
| 111 | |
| 112 | void setNullable(boolean nullable){ |
| 113 | this.nullable = nullable; |
| 114 | } |
| 115 | |
| 116 | boolean isNullable(){ |
| 117 | return nullable; |
| 118 | } |
| 119 | |
| 120 | void setDataType(int dataType){ |
| 121 | this.dataType = dataType; |
| 122 | } |
| 123 | |
| 124 | int getDataType(){ |
| 125 | return dataType; |
| 126 | } |
| 127 | |
| 128 | |
| 129 | int getDisplaySize(){ |
| 130 | return SSResultSetMetaData.getDisplaySize( dataType, precision, scale); |
| 131 | } |
| 132 | |
| 133 | void setScale(int scale){ |
| 134 | this.scale = scale; |
| 135 | } |
| 136 | |
| 137 | int getScale(){ |
| 138 | switch(dataType){ |
| 139 | case SQLTokenizer.DECIMAL: |
| 140 | case SQLTokenizer.NUMERIC: |
| 141 | return scale; |
| 142 | default: |
| 143 | return Expression.getScale(dataType); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | void setPrecision(int precision) throws SQLException{ |
| 148 | if(precision<0) throw Utils.createSQLException("Invalid column size " + precision + " for column '"+name+"'"); |
| 149 | this.precision = precision; |
| 150 | } |
| 151 | |
| 152 | int getPrecision(){ |
| 153 | return SSResultSetMetaData.getDataTypePrecision( dataType, precision ); |
| 154 | } |
| 155 | |
| 156 | int getColumnSize(){ |
| 157 | if(SSResultSetMetaData.isNumberDataType(dataType)) |
| 158 | return getPrecision(); |
| 159 | else return getDisplaySize(); |
| 160 | } |
| 161 | |
| 162 | |
| 163 | int getFlag(){ |
| 164 | return (identity ? 1 : 0) | |
| 165 | (caseSensitive ? 2 : 0) | |
| 166 | (nullable ? 4 : 0); |
| 167 | } |
| 168 | |
| 169 | |
| 170 | void setFlag(int flag){ |
| 171 | identity = (flag & 1) > 0; |
| 172 | caseSensitive = (flag & 2) > 0; |
| 173 | nullable = (flag & 4) > 0; |
| 174 | } |
| 175 | |
| 176 | |
| 177 | Column copy(){ |
| 178 | try{ |
| 179 | return (Column)clone(); |
| 180 | }catch(Exception e){return null;} |
| 181 | |
| 182 | } |
| 183 | } |