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BATCH-1619: fix paging queries for Derby, DB2 and SqlServer

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This commit is contained in:
dsyer
2010-08-26 06:10:58 +00:00
parent 5f48fccd2f
commit 8902e314d4
8 changed files with 92 additions and 13 deletions
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19
spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/support/SqlWindowingPagingQueryProvider.java
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@@ -16,6 +16,8 @@
package org.springframework.batch.item.database.support;
import org.springframework.util.StringUtils;
/**
* Generic Paging Query Provider using standard SQL:2003 windowing functions.
* These features are supported by DB2, Oracle, SQL Server 2005, Sybase and
@@ -35,11 +37,20 @@ public class SqlWindowingPagingQueryProvider extends AbstractSqlPagingQueryProvi
sql.append(") AS ROW_NUMBER");
sql.append(" FROM ").append(getFromClause()).append(
getWhereClause() == null ? "" : " WHERE " + getWhereClause());
sql.append(") ").append(getSubQueryAlias()).append("WHERE ROW_NUMBER <= ").append(pageSize);
String alias = extractTableAlias();
sql.append(") ").append(getSubQueryAlias()).append("WHERE " + alias + "ROW_NUMBER <= ").append(pageSize);
return sql.toString();
}
private String extractTableAlias() {
String alias = "" + getSubQueryAlias();
if (StringUtils.hasText(alias) && alias.toUpperCase().startsWith("AS")) {
alias = alias.substring(3).trim() + ".";
}
return alias;
}
protected Object getSubQueryAlias() {
return "";
}
@@ -65,7 +76,8 @@ public class SqlWindowingPagingQueryProvider extends AbstractSqlPagingQueryProvi
sql.append(" < ");
}
sql.append(getSortKeyPlaceHolder());
sql.append(") ").append(getSubQueryAlias()).append("WHERE ROW_NUMBER <= ").append(pageSize);
String alias = extractTableAlias();
sql.append(") ").append(getSubQueryAlias()).append("WHERE " + alias + "ROW_NUMBER <= ").append(pageSize);
return sql.toString();
}
@@ -85,7 +97,8 @@ public class SqlWindowingPagingQueryProvider extends AbstractSqlPagingQueryProvi
sql.append(") AS ROW_NUMBER");
sql.append(" FROM ").append(getFromClause()).append(
getWhereClause() == null ? "" : " WHERE " + getWhereClause());
sql.append(") ").append(getSubQueryAlias()).append("WHERE ROW_NUMBER = ").append(lastRowNum);
String alias = extractTableAlias();
sql.append(") ").append(getSubQueryAlias()).append("WHERE " + alias + "ROW_NUMBER = ").append(lastRowNum);
return sql.toString();
}