123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315 |
- /*
- @VaadinApache2LicenseForJavaFiles@
- */
- package com.vaadin.data.util.sqlcontainer.query.generator;
-
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
-
- import com.vaadin.data.Container.Filter;
- import com.vaadin.data.util.sqlcontainer.ColumnProperty;
- import com.vaadin.data.util.sqlcontainer.RowItem;
- import com.vaadin.data.util.sqlcontainer.SQLUtil;
- import com.vaadin.data.util.sqlcontainer.TemporaryRowId;
- import com.vaadin.data.util.sqlcontainer.query.OrderBy;
- import com.vaadin.data.util.sqlcontainer.query.generator.filter.QueryBuilder;
- import com.vaadin.data.util.sqlcontainer.query.generator.filter.StringDecorator;
-
- /**
- * Generates generic SQL that is supported by HSQLDB, MySQL and PostgreSQL.
- *
- * @author Jonatan Kronqvist / Vaadin Ltd
- */
- @SuppressWarnings("serial")
- public class DefaultSQLGenerator implements SQLGenerator {
-
- public DefaultSQLGenerator() {
-
- }
-
- /**
- * Construct a DefaultSQLGenerator with the specified identifiers for start
- * and end of quoted strings. The identifiers may be different depending on
- * the database engine and it's settings.
- *
- * @param quoteStart
- * the identifier (character) denoting the start of a quoted
- * string
- * @param quoteEnd
- * the identifier (character) denoting the end of a quoted string
- */
- public DefaultSQLGenerator(String quoteStart, String quoteEnd) {
- QueryBuilder.setStringDecorator(new StringDecorator(quoteStart,
- quoteEnd));
- }
-
- /*
- * (non-Javadoc)
- *
- * @see com.vaadin.addon.sqlcontainer.query.generator.SQLGenerator#
- * generateSelectQuery(java.lang.String, java.util.List, java.util.List,
- * int, int, java.lang.String)
- */
- @Override
- public StatementHelper generateSelectQuery(String tableName,
- List<Filter> filters, List<OrderBy> orderBys, int offset,
- int pagelength, String toSelect) {
- if (tableName == null || tableName.trim().equals("")) {
- throw new IllegalArgumentException("Table name must be given.");
- }
- toSelect = toSelect == null ? "*" : toSelect;
- StatementHelper sh = new StatementHelper();
- StringBuffer query = new StringBuffer();
- query.append("SELECT " + toSelect + " FROM ").append(
- SQLUtil.escapeSQL(tableName));
- if (filters != null) {
- query.append(QueryBuilder.getWhereStringForFilters(filters, sh));
- }
- if (orderBys != null) {
- for (OrderBy o : orderBys) {
- generateOrderBy(query, o, orderBys.indexOf(o) == 0);
- }
- }
- if (pagelength != 0) {
- generateLimits(query, offset, pagelength);
- }
- sh.setQueryString(query.toString());
- return sh;
- }
-
- /*
- * (non-Javadoc)
- *
- * @see com.vaadin.addon.sqlcontainer.query.generator.SQLGenerator#
- * generateUpdateQuery(java.lang.String,
- * com.vaadin.addon.sqlcontainer.RowItem)
- */
- @Override
- public StatementHelper generateUpdateQuery(String tableName, RowItem item) {
- if (tableName == null || tableName.trim().equals("")) {
- throw new IllegalArgumentException("Table name must be given.");
- }
- if (item == null) {
- throw new IllegalArgumentException("Updated item must be given.");
- }
- StatementHelper sh = new StatementHelper();
- StringBuffer query = new StringBuffer();
- query.append("UPDATE ").append(tableName).append(" SET");
-
- /* Generate column<->value and rowidentifiers map */
- Map<String, Object> columnToValueMap = generateColumnToValueMap(item);
- Map<String, Object> rowIdentifiers = generateRowIdentifiers(item);
- /* Generate columns and values to update */
- boolean first = true;
- for (String column : columnToValueMap.keySet()) {
- if (first) {
- query.append(" " + QueryBuilder.quote(column) + " = ?");
- } else {
- query.append(", " + QueryBuilder.quote(column) + " = ?");
- }
- sh.addParameterValue(columnToValueMap.get(column), item
- .getItemProperty(column).getType());
- first = false;
- }
- /* Generate identifiers for the row to be updated */
- first = true;
- for (String column : rowIdentifiers.keySet()) {
- if (first) {
- query.append(" WHERE " + QueryBuilder.quote(column) + " = ?");
- } else {
- query.append(" AND " + QueryBuilder.quote(column) + " = ?");
- }
- sh.addParameterValue(rowIdentifiers.get(column), item
- .getItemProperty(column).getType());
- first = false;
- }
- sh.setQueryString(query.toString());
- return sh;
- }
-
- /*
- * (non-Javadoc)
- *
- * @see com.vaadin.addon.sqlcontainer.query.generator.SQLGenerator#
- * generateInsertQuery(java.lang.String,
- * com.vaadin.addon.sqlcontainer.RowItem)
- */
- @Override
- public StatementHelper generateInsertQuery(String tableName, RowItem item) {
- if (tableName == null || tableName.trim().equals("")) {
- throw new IllegalArgumentException("Table name must be given.");
- }
- if (item == null) {
- throw new IllegalArgumentException("New item must be given.");
- }
- if (!(item.getId() instanceof TemporaryRowId)) {
- throw new IllegalArgumentException(
- "Cannot generate an insert query for item already in database.");
- }
- StatementHelper sh = new StatementHelper();
- StringBuffer query = new StringBuffer();
- query.append("INSERT INTO ").append(tableName).append(" (");
-
- /* Generate column<->value map */
- Map<String, Object> columnToValueMap = generateColumnToValueMap(item);
- /* Generate column names for insert query */
- boolean first = true;
- for (String column : columnToValueMap.keySet()) {
- if (!first) {
- query.append(", ");
- }
- query.append(QueryBuilder.quote(column));
- first = false;
- }
-
- /* Generate values for insert query */
- query.append(") VALUES (");
- first = true;
- for (String column : columnToValueMap.keySet()) {
- if (!first) {
- query.append(", ");
- }
- query.append("?");
- sh.addParameterValue(columnToValueMap.get(column), item
- .getItemProperty(column).getType());
- first = false;
- }
- query.append(")");
- sh.setQueryString(query.toString());
- return sh;
- }
-
- /*
- * (non-Javadoc)
- *
- * @see com.vaadin.addon.sqlcontainer.query.generator.SQLGenerator#
- * generateDeleteQuery(java.lang.String,
- * com.vaadin.addon.sqlcontainer.RowItem)
- */
- @Override
- public StatementHelper generateDeleteQuery(String tableName,
- List<String> primaryKeyColumns, String versionColumn, RowItem item) {
- if (tableName == null || tableName.trim().equals("")) {
- throw new IllegalArgumentException("Table name must be given.");
- }
- if (item == null) {
- throw new IllegalArgumentException(
- "Item to be deleted must be given.");
- }
- if (primaryKeyColumns == null || primaryKeyColumns.isEmpty()) {
- throw new IllegalArgumentException(
- "Valid keyColumnNames must be provided.");
- }
- StatementHelper sh = new StatementHelper();
- StringBuffer query = new StringBuffer();
- query.append("DELETE FROM ").append(tableName).append(" WHERE ");
- int count = 1;
- for (String keyColName : primaryKeyColumns) {
- if ((this instanceof MSSQLGenerator || this instanceof OracleGenerator)
- && keyColName.equalsIgnoreCase("rownum")) {
- count++;
- continue;
- }
- if (count > 1) {
- query.append(" AND ");
- }
- if (item.getItemProperty(keyColName).getValue() != null) {
- query.append(QueryBuilder.quote(keyColName) + " = ?");
- sh.addParameterValue(item.getItemProperty(keyColName)
- .getValue(), item.getItemProperty(keyColName).getType());
- }
- count++;
- }
- if (versionColumn != null) {
- query.append(String.format(" AND %s = ?",
- QueryBuilder.quote(versionColumn)));
- sh.addParameterValue(
- item.getItemProperty(versionColumn).getValue(), item
- .getItemProperty(versionColumn).getType());
- }
-
- sh.setQueryString(query.toString());
- return sh;
- }
-
- /**
- * Generates sorting rules as an ORDER BY -clause
- *
- * @param sb
- * StringBuffer to which the clause is appended.
- * @param o
- * OrderBy object to be added into the sb.
- * @param firstOrderBy
- * If true, this is the first OrderBy.
- * @return
- */
- protected StringBuffer generateOrderBy(StringBuffer sb, OrderBy o,
- boolean firstOrderBy) {
- if (firstOrderBy) {
- sb.append(" ORDER BY ");
- } else {
- sb.append(", ");
- }
- sb.append(QueryBuilder.quote(o.getColumn()));
- if (o.isAscending()) {
- sb.append(" ASC");
- } else {
- sb.append(" DESC");
- }
- return sb;
- }
-
- /**
- * Generates the LIMIT and OFFSET clause.
- *
- * @param sb
- * StringBuffer to which the clause is appended.
- * @param offset
- * Value for offset.
- * @param pagelength
- * Value for pagelength.
- * @return StringBuffer with LIMIT and OFFSET clause added.
- */
- protected StringBuffer generateLimits(StringBuffer sb, int offset,
- int pagelength) {
- sb.append(" LIMIT ").append(pagelength).append(" OFFSET ")
- .append(offset);
- return sb;
- }
-
- protected Map<String, Object> generateColumnToValueMap(RowItem item) {
- Map<String, Object> columnToValueMap = new HashMap<String, Object>();
- for (Object id : item.getItemPropertyIds()) {
- ColumnProperty cp = (ColumnProperty) item.getItemProperty(id);
- /* Prevent "rownum" usage as a column name if MSSQL or ORACLE */
- if ((this instanceof MSSQLGenerator || this instanceof OracleGenerator)
- && cp.getPropertyId().equalsIgnoreCase("rownum")) {
- continue;
- }
- Object value = cp.getValue() == null ? null : cp.getValue();
- /* Only include properties whose read-only status can be altered */
- if (cp.isReadOnlyChangeAllowed() && !cp.isVersionColumn()) {
- columnToValueMap.put(cp.getPropertyId(), value);
- }
- }
- return columnToValueMap;
- }
-
- protected Map<String, Object> generateRowIdentifiers(RowItem item) {
- Map<String, Object> rowIdentifiers = new HashMap<String, Object>();
- for (Object id : item.getItemPropertyIds()) {
- ColumnProperty cp = (ColumnProperty) item.getItemProperty(id);
- /* Prevent "rownum" usage as a column name if MSSQL or ORACLE */
- if ((this instanceof MSSQLGenerator || this instanceof OracleGenerator)
- && cp.getPropertyId().equalsIgnoreCase("rownum")) {
- continue;
- }
- Object value = cp.getValue() == null ? null : cp.getValue();
- if (!cp.isReadOnlyChangeAllowed() || cp.isVersionColumn()) {
- rowIdentifiers.put(cp.getPropertyId(), value);
- }
- }
- return rowIdentifiers;
- }
- }
|