Source Code Cross Referenced for SqlParamUsage.java in  » Testing » PolePosition-0.20 » com » versant » core » jdbc » sql » exp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » PolePosition 0.20 » com.versant.core.jdbc.sql.exp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998 - 2005 Versant Corporation
003:         * All rights reserved. This program and the accompanying materials
004:         * are made available under the terms of the Eclipse Public License v1.0
005:         * which accompanies this distribution, and is available at
006:         * http://www.eclipse.org/legal/epl-v10.html
007:         *
008:         * Contributors:
009:         * Versant Corporation - initial API and implementation
010:         */
011:        package com.versant.core.jdbc.sql.exp;
012:
013:        import com.versant.core.jdbc.metadata.JdbcField;
014:        import com.versant.core.jdbc.metadata.JdbcColumn;
015:
016:        import java.util.Map;
017:
018:        /**
019:         * This tracks usage of this parameter in an SqlExp tree.
020:         * A parameter may be used several times in the same tree if it is
021:         * used more than once in the original filter expression. This will be
022:         * null if the param is not used.<p>
023:         *
024:         * A parameter may also have to be split into more than one SqlExp
025:         * if it is compared to a field with multiple columns. The first
026:         * expression is expList. The expcount field specifies how far down
027:         * the list to go as expList may be part of a larger list.
028:         *
029:         * @see com.versant.core.jdo.query.ParamNode#usageList
030:         */
031:        public class SqlParamUsage {
032:
033:            /**
034:             * The field for this parameter or null if it is not being compared
035:             * to a field.
036:             * @see #javaTypeCode
037:             * @see #jdbcType
038:             */
039:            public JdbcField jdbcField;
040:
041:            public JdbcColumn col;
042:            /**
043:             * The java type code of this usage of the parameter. This is not
044:             * set if jdbcField is not null.
045:             * @see #jdbcField
046:             */
047:            public int javaTypeCode;
048:            /**
049:             * The JDBC type of this usage of the parameter. This is not
050:             * set if jdbcField is not null.
051:             * @see java.sql.Types
052:             * @see #jdbcField
053:             */
054:            public int jdbcType;
055:            /**
056:             * The class index of the class for this parameter (-1 if unknown).
057:             * This is used for OID parameters compared to columns that are
058:             * not associated with a field e.g. in a link table.
059:             */
060:            public int classIndex;
061:            /**
062:             * The first expression for this usage of the parameter. This is
063:             * the parent of the first ParamExp instance for this usage.
064:             */
065:            public SqlExp expList;
066:            /**
067:             * The number of expressions in expList for this usage of the
068:             * parameter. If a param is used with a field split over multiple
069:             * columns then this will be more than 1. This will be zero if
070:             * the parameter never has to be converted into a 'is null' or
071:             * 'is not null' expression.
072:             */
073:            public int expCount;
074:            /**
075:             * How must the parameter value be modified before being set? This is
076:             * used for startsWith and endsWith for databases that do not allow
077:             * expressions on the right hand side of a LIKE (e.g. Informix).
078:             * @see com.versant.core.jdbc.query.SqlStruct.Param#MOD_APPEND_PERCENT
079:             */
080:            public int mod;
081:            /**
082:             * The next usage in the list.
083:             */
084:            public SqlParamUsage next;
085:
086:            public SqlParamUsage getClone(Map cloneMap) {
087:                SqlParamUsage sqlUsage = new SqlParamUsage();
088:                sqlUsage.jdbcField = jdbcField;
089:                sqlUsage.javaTypeCode = javaTypeCode;
090:                sqlUsage.jdbcType = jdbcType;
091:                sqlUsage.classIndex = classIndex;
092:                sqlUsage.expCount = expCount;
093:                sqlUsage.mod = mod;
094:                sqlUsage.expList = SqlExp.createClone(expList, cloneMap);
095:                if (next != null) {
096:                    sqlUsage.next = next.getClone(cloneMap);
097:                }
098:                return sqlUsage;
099:            }
100:        }
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