Java Code Examples for org.springframework.jdbc.datasource.DataSourceUtils.applyTransactionTimeout()

The following are Jave code examples for showing how to use applyTransactionTimeout() of the org.springframework.jdbc.datasource.DataSourceUtils class. You can vote up the examples you like. Your votes will be used in our system to get more good examples.
+ Save this method
Example 1
Project: lams   File: AbstractSequenceMaxValueIncrementer.java   View Source Code Vote up 6 votes
/**
 * Executes the SQL as specified by {@link #getSequenceQuery()}.
 */
@Override
protected long getNextKey() throws DataAccessException {
	Connection con = DataSourceUtils.getConnection(getDataSource());
	Statement stmt = null;
	ResultSet rs = null;
	try {
		stmt = con.createStatement();
		DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
		rs = stmt.executeQuery(getSequenceQuery());
		if (rs.next()) {
			return rs.getLong(1);
		}
		else {
			throw new DataAccessResourceFailureException("Sequence query did not return a result");
		}
	}
	catch (SQLException ex) {
		throw new DataAccessResourceFailureException("Could not obtain sequence value", ex);
	}
	finally {
		JdbcUtils.closeResultSet(rs);
		JdbcUtils.closeStatement(stmt);
		DataSourceUtils.releaseConnection(con, getDataSource());
	}
}
 
Example 2
Project: spring4-understanding   File: AbstractSequenceMaxValueIncrementer.java   View Source Code Vote up 6 votes
/**
 * Executes the SQL as specified by {@link #getSequenceQuery()}.
 */
@Override
protected long getNextKey() throws DataAccessException {
	Connection con = DataSourceUtils.getConnection(getDataSource());
	Statement stmt = null;
	ResultSet rs = null;
	try {
		stmt = con.createStatement();
		DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
		rs = stmt.executeQuery(getSequenceQuery());
		if (rs.next()) {
			return rs.getLong(1);
		}
		else {
			throw new DataAccessResourceFailureException("Sequence query did not return a result");
		}
	}
	catch (SQLException ex) {
		throw new DataAccessResourceFailureException("Could not obtain sequence value", ex);
	}
	finally {
		JdbcUtils.closeResultSet(rs);
		JdbcUtils.closeStatement(stmt);
		DataSourceUtils.releaseConnection(con, getDataSource());
	}
}
 
Example 3
Project: class-guard   File: AbstractSequenceMaxValueIncrementer.java   View Source Code Vote up 6 votes
/**
 * Executes the SQL as specified by {@link #getSequenceQuery()}.
 */
@Override
protected long getNextKey() throws DataAccessException {
	Connection con = DataSourceUtils.getConnection(getDataSource());
	Statement stmt = null;
	ResultSet rs = null;
	try {
		stmt = con.createStatement();
		DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
		rs = stmt.executeQuery(getSequenceQuery());
		if (rs.next()) {
			return rs.getLong(1);
		}
		else {
			throw new DataAccessResourceFailureException("Sequence query did not return a result");
		}
	}
	catch (SQLException ex) {
		throw new DataAccessResourceFailureException("Could not obtain sequence value", ex);
	}
	finally {
		JdbcUtils.closeResultSet(rs);
		JdbcUtils.closeStatement(stmt);
		DataSourceUtils.releaseConnection(con, getDataSource());
	}
}
 
Example 4
Project: spring4-understanding   File: AbstractIdentityColumnMaxValueIncrementer.java   View Source Code Vote up 5 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that @@identity
		* returns the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate(getIncrementStatement());
				ResultSet rs = stmt.executeQuery(getIdentityStatement());
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("Identity statement failed after inserting");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			stmt.executeUpdate(getDeleteStatement(this.valueCache));
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not increment identity", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 5
Project: lams   File: SybaseMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that @@identity
		* returnes the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate(getIncrementStatement());
				ResultSet rs = stmt.executeQuery("select @@identity");
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("@@identity failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not increment identity", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 6
Project: lams   File: SqlServerMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that @@identity
		* returnes the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate("insert into " + getIncrementerName() + " default values");
				ResultSet rs = stmt.executeQuery("select @@identity");
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("@@identity failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not increment identity", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 7
Project: lams   File: MySQLMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.maxId == this.nextId) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that last_insert_id()
		* returned the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			// Increment the sequence column...
			String columnName = getColumnName();
			stmt.executeUpdate("update "+ getIncrementerName() + " set " + columnName +
					" = last_insert_id(" + columnName + " + " + getCacheSize() + ")");
			// Retrieve the new max of the sequence column...
			ResultSet rs = stmt.executeQuery(VALUE_SQL);
			try {
				if (!rs.next()) {
					throw new DataAccessResourceFailureException("last_insert_id() failed after executing an update");
				}
				this.maxId = rs.getLong(1);
			}
			finally {
				JdbcUtils.closeResultSet(rs);
			}
			this.nextId = this.maxId - getCacheSize() + 1;
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain last_insert_id()", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	else {
		this.nextId++;
	}
	return this.nextId;
}
 
Example 8
Project: lams   File: DerbyMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that last_insert_id()
		* returned the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate("insert into " + getIncrementerName() + " (" + getDummyName() + ") values(null)");
				ResultSet rs = stmt.executeQuery("select IDENTITY_VAL_LOCAL() from " + getIncrementerName());
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("IDENTITY_VAL_LOCAL() failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain IDENTITY value", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 9
Project: lams   File: HsqlMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same Connection. Otherwise we can't be sure that last_insert_id()
		* returned the correct value.
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate("insert into " + getIncrementerName() + " values(null)");
				ResultSet rs = stmt.executeQuery("select max(identity()) from " + getIncrementerName());
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("identity() failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain identity()", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 10
Project: lodsve-framework   File: MySQLIDGenerator.java   View Source Code Vote up 4 votes
@Override
 public synchronized Long nextId(String sequenceName) {
     if (NEXT_ID_CACHE.get(sequenceName) != null) {
         this.nextId = NEXT_ID_CACHE.get(sequenceName);
     }
     if (MAX_ID_CACHE.get(sequenceName) != null) {
         this.maxId = MAX_ID_CACHE.get(sequenceName);
     }

     if (this.maxId == this.nextId) {
         /*
         * Need to use straight JDBC code because we need to make sure that the insert and select
* are performed on the same connection (otherwise we can't be sure that last_insert_id()
* returned the correct value)
*/

         Connection con = DataSourceUtils.getConnection(dataSource);
         Statement stmt = null;
         try {
             stmt = con.createStatement();
             DataSourceUtils.applyTransactionTimeout(stmt, dataSource);
             String updateSql = "update " + sequenceName + " set " + sequenceName + " = last_insert_id(" + sequenceName + " + " + getCacheSize() + ")";
             try {
                 // Increment the sequence column...
                 stmt.executeUpdate(updateSql);
             } catch (SQLException e) {
                 //发生异常,即不存在这张表
                 //1.执行新建这张表的语句
                 StringBuffer createSql = new StringBuffer();
                 createSql.append("create table ").append(sequenceName).append(" ( ");
                 createSql.append(sequenceName).append(" bigint(12) default null ");
                 createSql.append(" ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci ");
                 stmt.execute(createSql.toString());
                 //2.初始化这张表的数据(将name的值置为0)
                 String initDataSql = "insert into " + sequenceName + " values(0)";
                 stmt.executeUpdate(initDataSql);
                 //3.Increment the sequence column...
                 stmt.executeUpdate(updateSql);
             }
             // Retrieve the new max of the sequence column...
             ResultSet rs = stmt.executeQuery(VALUE_SQL);
             try {
                 if (!rs.next()) {
                     throw new DataAccessResourceFailureException("last_insert_id() failed after executing an update");
                 }
                 this.maxId = rs.getLong(1);
                 //更新缓存
                 MAX_ID_CACHE.put(sequenceName, this.maxId);
             } finally {
                 JdbcUtils.closeResultSet(rs);
             }
             this.nextId = this.maxId - getCacheSize() + 1;
             //更新缓存
             NEXT_ID_CACHE.put(sequenceName, this.nextId);
         } catch (SQLException ex) {
             throw new DataAccessResourceFailureException("Could not obtain last_insert_id()", ex);
         } finally {
             JdbcUtils.closeStatement(stmt);
             DataSourceUtils.releaseConnection(con, dataSource);
         }
     } else {
         this.nextId++;
         //更新缓存
         NEXT_ID_CACHE.put(sequenceName, this.nextId);
     }
     long result = this.nextId;

     //初始化nextId和maxId
     this.nextId = 0;
     this.maxId = 0;
     return result;
 }
 
Example 11
Project: spring4-understanding   File: MySQLMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.maxId == this.nextId) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that last_insert_id()
		* returned the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			// Increment the sequence column...
			String columnName = getColumnName();
			stmt.executeUpdate("update "+ getIncrementerName() + " set " + columnName +
					" = last_insert_id(" + columnName + " + " + getCacheSize() + ")");
			// Retrieve the new max of the sequence column...
			ResultSet rs = stmt.executeQuery(VALUE_SQL);
			try {
				if (!rs.next()) {
					throw new DataAccessResourceFailureException("last_insert_id() failed after executing an update");
				}
				this.maxId = rs.getLong(1);
			}
			finally {
				JdbcUtils.closeResultSet(rs);
			}
			this.nextId = this.maxId - getCacheSize() + 1;
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain last_insert_id()", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	else {
		this.nextId++;
	}
	return this.nextId;
}
 
Example 12
Project: class-guard   File: SybaseMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that @@identity
		* returnes the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate(getIncrementStatement());
				ResultSet rs = stmt.executeQuery("select @@identity");
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("@@identity failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not increment identity", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 13
Project: class-guard   File: SqlServerMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that @@identity
		* returnes the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate("insert into " + getIncrementerName() + " default values");
				ResultSet rs = stmt.executeQuery("select @@identity");
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("@@identity failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not increment identity", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 14
Project: class-guard   File: MySQLMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.maxId == this.nextId) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that last_insert_id()
		* returned the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			// Increment the sequence column...
			String columnName = getColumnName();
			stmt.executeUpdate("update "+ getIncrementerName() + " set " + columnName +
					" = last_insert_id(" + columnName + " + " + getCacheSize() + ")");
			// Retrieve the new max of the sequence column...
			ResultSet rs = stmt.executeQuery(VALUE_SQL);
			try {
				if (!rs.next()) {
					throw new DataAccessResourceFailureException("last_insert_id() failed after executing an update");
				}
				this.maxId = rs.getLong(1);
			}
			finally {
				JdbcUtils.closeResultSet(rs);
			}
			this.nextId = this.maxId - getCacheSize() + 1;
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain last_insert_id()", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	else {
		this.nextId++;
	}
	return this.nextId;
}
 
Example 15
Project: class-guard   File: DerbyMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same connection (otherwise we can't be sure that last_insert_id()
		* returned the correct value)
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate("insert into " + getIncrementerName() + " (" + getDummyName() + ") values(null)");
				ResultSet rs = stmt.executeQuery("select IDENTITY_VAL_LOCAL() from " + getIncrementerName());
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("IDENTITY_VAL_LOCAL() failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain IDENTITY value", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}
 
Example 16
Project: class-guard   File: HsqlMaxValueIncrementer.java   View Source Code Vote up 4 votes
@Override
protected synchronized long getNextKey() throws DataAccessException {
	if (this.nextValueIndex < 0 || this.nextValueIndex >= getCacheSize()) {
		/*
		* Need to use straight JDBC code because we need to make sure that the insert and select
		* are performed on the same Connection. Otherwise we can't be sure that last_insert_id()
		* returned the correct value.
		*/
		Connection con = DataSourceUtils.getConnection(getDataSource());
		Statement stmt = null;
		try {
			stmt = con.createStatement();
			DataSourceUtils.applyTransactionTimeout(stmt, getDataSource());
			this.valueCache = new long[getCacheSize()];
			this.nextValueIndex = 0;
			for (int i = 0; i < getCacheSize(); i++) {
				stmt.executeUpdate("insert into " + getIncrementerName() + " values(null)");
				ResultSet rs = stmt.executeQuery("select max(identity()) from " + getIncrementerName());
				try {
					if (!rs.next()) {
						throw new DataAccessResourceFailureException("identity() failed after executing an update");
					}
					this.valueCache[i] = rs.getLong(1);
				}
				finally {
					JdbcUtils.closeResultSet(rs);
				}
			}
			long maxValue = this.valueCache[(this.valueCache.length - 1)];
			stmt.executeUpdate("delete from " + getIncrementerName() + " where " + getColumnName() + " < " + maxValue);
		}
		catch (SQLException ex) {
			throw new DataAccessResourceFailureException("Could not obtain identity()", ex);
		}
		finally {
			JdbcUtils.closeStatement(stmt);
			DataSourceUtils.releaseConnection(con, getDataSource());
		}
	}
	return this.valueCache[this.nextValueIndex++];
}