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Java > Open Source Codes > org > objectstyle > cayenne > access > trans > UpdateBatchQueryBuilder


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56
57 package org.objectstyle.cayenne.access.trans;
58
59 import java.sql.PreparedStatement JavaDoc;
60 import java.sql.SQLException JavaDoc;
61 import java.util.Iterator JavaDoc;
62 import java.util.List JavaDoc;
63
64 import org.objectstyle.cayenne.dba.DbAdapter;
65 import org.objectstyle.cayenne.map.DbAttribute;
66 import org.objectstyle.cayenne.query.BatchQuery;
67 import org.objectstyle.cayenne.query.UpdateBatchQuery;
68
69 /**
70  * A translator for UpdateBatchQueries that produces parameterized SQL.
71  *
72  * @author Andriy Shapochka, Andrei Adamchik, Mike Kienenberger
73  */

74
75 public class UpdateBatchQueryBuilder extends BatchQueryBuilder {
76
77     public UpdateBatchQueryBuilder(DbAdapter adapter) {
78         super(adapter);
79     }
80
81     public String JavaDoc createSqlString(BatchQuery batch) {
82         UpdateBatchQuery updateBatch = (UpdateBatchQuery) batch;
83         String JavaDoc table = batch.getDbEntity().getFullyQualifiedName();
84         List JavaDoc qualifierAttributes = updateBatch.getQualifierAttributes();
85         List JavaDoc updatedDbAttributes = updateBatch.getUpdatedAttributes();
86
87         StringBuffer JavaDoc query = new StringBuffer JavaDoc("UPDATE ");
88         query.append(table).append(" SET ");
89
90         int len = updatedDbAttributes.size();
91         for (int i = 0; i < len; i++) {
92             if (i > 0) {
93                 query.append(", ");
94             }
95
96             DbAttribute attribute = (DbAttribute) updatedDbAttributes.get(i);
97             query.append(attribute.getName()).append(" = ?");
98         }
99
100         query.append(" WHERE ");
101
102         Iterator JavaDoc i = qualifierAttributes.iterator();
103         while (i.hasNext()) {
104             DbAttribute attribute = (DbAttribute) i.next();
105             appendDbAttribute(query, attribute);
106             query.append(updateBatch.isNull(attribute) ? " IS NULL" : " = ?");
107
108             if (i.hasNext()) {
109                 query.append(" AND ");
110             }
111         }
112
113         return query.toString();
114     }
115
116     /**
117      * Binds BatchQuery parameters to the PreparedStatement.
118      */

119     public void bindParameters(PreparedStatement JavaDoc statement, BatchQuery query)
120             throws SQLException JavaDoc, Exception JavaDoc {
121
122         UpdateBatchQuery updateBatch = (UpdateBatchQuery) query;
123         List JavaDoc qualifierAttributes = updateBatch.getQualifierAttributes();
124         List JavaDoc updatedDbAttributes = updateBatch.getUpdatedAttributes();
125
126         int len = updatedDbAttributes.size();
127         int parameterIndex = 1;
128         for (int i = 0; i < len; i++) {
129             Object JavaDoc value = query.getValue(i);
130
131             DbAttribute attribute = (DbAttribute) updatedDbAttributes.get(i);
132             adapter.bindParameter(
133                     statement,
134                     value,
135                     parameterIndex++,
136                     attribute.getType(),
137                     attribute.getPrecision());
138         }
139
140         for (int i = 0; i < qualifierAttributes.size(); i++) {
141             Object JavaDoc value = query.getValue(len + i);
142
143             // skip null values... they are translated as "IS NULL"
144
if (null == value)
145                 continue;
146
147             DbAttribute attribute = (DbAttribute) qualifierAttributes.get(i);
148             adapter.bindParameter(
149                     statement,
150                     value,
151                     parameterIndex++,
152                     attribute.getType(),
153                     attribute.getPrecision());
154         }
155     }
156 }
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