Source Code Cross Referenced for DBSource.java in  » Testing » Marathon » com » ziclix » python » sql » pipe » db » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Marathon » com.ziclix.python.sql.pipe.db 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Jython Database Specification API 2.0
003:         *
004:         * $Id: DBSource.java 2414 2005-02-23 04:26:23Z bzimmer $
005:         *
006:         * Copyright (c) 2001 brian zimmer <bzimmer@ziclix.com>
007:         *
008:         */
009:        package com.ziclix.python.sql.pipe.db;
010:
011:        import com.ziclix.python.sql.PyConnection;
012:        import com.ziclix.python.sql.pipe.Source;
013:        import org.python.core.Py;
014:        import org.python.core.PyObject;
015:        import org.python.core.PyTuple;
016:
017:        /**
018:         * A database source.  Given a PyConnection and information about the query, produce the data.
019:         *
020:         * @author brian zimmer
021:         * @version $Revision: 2414 $
022:         */
023:        public class DBSource extends BaseDB implements  Source {
024:
025:            /**
026:             * Field sql
027:             */
028:            protected String sql;
029:
030:            /**
031:             * Field sentHeader
032:             */
033:            protected boolean sentHeader;
034:
035:            /**
036:             * Field params, include
037:             */
038:            protected PyObject params, include;
039:
040:            /**
041:             * Constructor for handling the generation of data.
042:             *
043:             * @param connection  the database connection
044:             * @param dataHandler a custom DataHandler for the cursor, can be None
045:             * @param tableName   the table in question on the source database
046:             * @param where       an optional where clause, defaults to '(1=1)' if null
047:             * @param include     the columns to be queried from the source, '*' if None
048:             * @param params      optional params to substituted in the where clause
049:             */
050:            public DBSource(PyConnection connection, Class dataHandler,
051:                    String tableName, String where, PyObject include,
052:                    PyObject params) {
053:
054:                super (connection, dataHandler, tableName);
055:
056:                this .params = params;
057:                this .include = include;
058:                this .sentHeader = false;
059:                this .sql = this .createSql(where);
060:            }
061:
062:            /**
063:             * Create the sql string given the where clause.
064:             */
065:            protected String createSql(String where) {
066:
067:                // create the sql statement, using the columns if available
068:                StringBuffer sb = new StringBuffer("select ");
069:
070:                if ((this .include == Py.None) || (this .include.__len__() == 0)) {
071:                    sb.append("*");
072:                } else {
073:                    for (int i = 1; i < this .include.__len__(); i++) {
074:                        sb.append(this .include.__getitem__(i)).append(",");
075:                    }
076:
077:                    sb.append(this .include
078:                            .__getitem__(this .include.__len__() - 1));
079:                }
080:
081:                sb.append(" from ").append(this .tableName);
082:                sb.append(" where ").append((where == null) ? "(1=1)" : where);
083:
084:                String sql = sb.toString();
085:
086:                return sql;
087:            }
088:
089:            /**
090:             * Return the next row in the result set.  The first row returned will be column information.
091:             */
092:            public PyObject next() {
093:
094:                if (this .sentHeader) {
095:
096:                    // Py.None will be sent when all done, so this will close down the queue
097:                    return this .cursor.fetchone();
098:                } else {
099:                    this .cursor.execute(Py.newString(this .sql), this .params,
100:                            Py.None, Py.None);
101:
102:                    PyObject description = this .cursor
103:                            .__findattr__("description");
104:
105:                    // we can't insert if we don't know column names
106:                    if ((description == Py.None)
107:                            || (description.__len__() == 0)) {
108:
109:                        // let the destination worry about handling the empty set
110:                        return Py.None;
111:                    }
112:
113:                    int len = description.__len__();
114:                    PyObject[] columns = new PyObject[len];
115:
116:                    for (int i = 0; i < len; i++) {
117:                        PyObject[] colInfo = new PyObject[2];
118:
119:                        // col name
120:                        colInfo[0] = description.__getitem__(i).__getitem__(0);
121:
122:                        // col type
123:                        colInfo[1] = description.__getitem__(i).__getitem__(1);
124:                        columns[i] = new PyTuple(colInfo);
125:                    }
126:
127:                    PyObject row = new PyTuple(columns);
128:
129:                    Py.writeDebug("db-source", row.toString());
130:
131:                    this .sentHeader = true;
132:
133:                    return row;
134:                }
135:            }
136:
137:            /**
138:             * Method start
139:             */
140:            public void start() {
141:            }
142:
143:            /**
144:             * Close the cursor.
145:             */
146:            public void end() {
147:
148:                if (this.cursor != null) {
149:                    this.cursor.close();
150:                }
151:            }
152:        }
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