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/**
* H2GIS is a library that brings spatial support to the H2 Database Engine
* . H2GIS is developed by CNRS
* .
*
* This code is part of the H2GIS project. H2GIS is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* Lesser General Public License as published by the Free Software Foundation;
* version 3.0 of the License.
*
* H2GIS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details .
*
*
* For more information, please consult:
* or contact directly: info_at_h2gis.org
*/
package org.h2gis.utilities;
import org.h2gis.api.ProgressVisitor;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.List;
/**
* DBMS should follow standard but it is not always the case, this class do some common operations.
* Compatible with H2 and PostgreSQL.
* @author Nicolas Fortin
* @author Erwan Bocher
* @author Adam Gouge
*/
public class JDBCUtilities {
public enum FUNCTION_TYPE { ALL, BUILT_IN, ALIAS}
public static final String H2_DRIVER_NAME = "H2 JDBC Driver";
private JDBCUtilities() {}
private static ResultSet getTablesView(Connection connection, String catalog, String schema, String table) throws SQLException {
Integer catalogIndex = null;
Integer schemaIndex = null;
Integer tableIndex = 1;
StringBuilder sb = new StringBuilder("SELECT * from INFORMATION_SCHEMA.TABLES where ");
if(!catalog.isEmpty()) {
sb.append("UPPER(table_catalog) = ? AND ");
catalogIndex = 1;
tableIndex++;
}
if(!schema.isEmpty()) {
sb.append("UPPER(table_schema) = ? AND ");
schemaIndex = tableIndex;
tableIndex++;
}
sb.append("UPPER(table_name) = ? ");
PreparedStatement geomStatement = connection.prepareStatement(sb.toString());
if(catalogIndex!=null) {
geomStatement.setString(catalogIndex,catalog.toUpperCase());
}
if(schemaIndex!=null) {
geomStatement.setString(schemaIndex,schema.toUpperCase());
}
geomStatement.setString(tableIndex,table.toUpperCase());
return geomStatement.executeQuery();
}
/**
* Return true if table tableName contains field fieldName.
*
* @param connection Connection
* @param tableName Table name
* @param fieldName Field name
* @return True if the table contains the field
* @throws SQLException
*/
public static boolean hasField(Connection connection, String tableName, String fieldName) throws SQLException {
final Statement statement = connection.createStatement();
try {
final ResultSet resultSet = statement.executeQuery(
"SELECT * FROM " + TableLocation.parse(tableName) + " LIMIT 0;");
try {
return hasField(resultSet.getMetaData(), fieldName);
} finally {
resultSet.close();
}
} catch (SQLException ex) {
return false;
} finally {
statement.close();
}
}
private static boolean hasField(ResultSetMetaData resultSetMetaData, String fieldName) throws SQLException {
return getFieldIndex(resultSetMetaData, fieldName) != -1;
}
/**
* Fetch the metadata, and check field name
* @param resultSetMetaData Active result set meta data.
* @param fieldName Field name, ignore case
* @return The field index [1-n]; -1 if the field is not found
* @throws SQLException
*/
public static int getFieldIndex(ResultSetMetaData resultSetMetaData, String fieldName) throws SQLException {
for(int columnId = 1; columnId <= resultSetMetaData.getColumnCount(); columnId++) {
if(fieldName.equalsIgnoreCase(resultSetMetaData.getColumnName(columnId))) {
return columnId;
}
}
return -1;
}
/**
* @param meta DataBase meta data
* @param table Table identifier [[catalog.]schema.]table
* @param fieldIndex Field ordinal position [1-n]
* @return The field name, empty if the field position or table is not found
* @throws SQLException If jdbc throws an error
*/
public static String getFieldName(DatabaseMetaData meta, String table, int fieldIndex) throws SQLException {
TableLocation location = TableLocation.parse(table);
ResultSet rs = meta.getColumns(location.getCatalog(null), location.getSchema(null), location.getTable(), null);
try {
while(rs.next()) {
if(rs.getInt("ORDINAL_POSITION") == fieldIndex) {
return rs.getString("COLUMN_NAME");
}
}
} finally {
rs.close();
}
return "";
}
/**
* Returns the list of all the field name of a table.
*
* @param meta DataBase meta data
* @param table Table identifier [[catalog.]schema.]table
* @return The list of field name.
* @throws SQLException If jdbc throws an error
*/
public static List getFieldNames(DatabaseMetaData meta, String table) throws SQLException {
List fieldNameList = new ArrayList();
TableLocation location = TableLocation.parse(table);
ResultSet rs = meta.getColumns(location.getCatalog(null), location.getSchema(null), location.getTable(), null);
try {
while(rs.next()) {
fieldNameList.add(rs.getString("COLUMN_NAME"));
}
} finally {
rs.close();
}
return fieldNameList;
}
/**
* Fetch the row count of a table.
* @param connection Active connection.
* @param tableReference Table reference
* @return Row count
* @throws SQLException If the table does not exists, or sql request fail.
*/
public static int getRowCount(Connection connection, String tableReference) throws SQLException {
Statement st = connection.createStatement();
int rowCount = 0;
try {
ResultSet rs = st.executeQuery(String.format("select count(*) rowcount from %s", TableLocation.parse(tableReference)));
try {
if(rs.next()) {
rowCount = rs.getInt(1);
}
} finally {
rs.close();
}
}finally {
st.close();
}
return rowCount;
}
/**
* Read INFORMATION_SCHEMA.TABLES in order to see if the provided table reference is a temporary table.
* @param connection Active connection not closed by this method
* @param tableReference Table reference
* @return True if the provided table is temporary.
* @throws SQLException If the table does not exists.
*/
public static boolean isTemporaryTable(Connection connection, String tableReference) throws SQLException {
TableLocation location = TableLocation.parse(tableReference);
ResultSet rs = getTablesView(connection, location.getCatalog(), location.getSchema(), location.getTable());
boolean isTemporary = false;
try {
if(rs.next()) {
String tableType;
if(hasField(rs.getMetaData(), "STORAGE_TYPE")) {
// H2
tableType = rs.getString("STORAGE_TYPE");
} else {
// Standard SQL
tableType = rs.getString("TABLE_TYPE");
}
isTemporary = tableType.contains("TEMPORARY");
} else {
throw new SQLException("The table "+location+" does not exists");
}
} finally {
rs.close();
}
return isTemporary;
}
/**
* Read INFORMATION_SCHEMA.TABLES in order to see if the provided table reference is a linked table.
* @param connection Active connection not closed by this method
* @param tableReference Table reference
* @return True if the provided table is linked.
* @throws SQLException If the table does not exists.
*/
public static boolean isLinkedTable(Connection connection, String tableReference) throws SQLException {
TableLocation location = TableLocation.parse(tableReference);
ResultSet rs = getTablesView(connection, location.getCatalog(), location.getSchema(), location.getTable());
boolean isLinked;
try {
if(rs.next()) {
String tableType = rs.getString("TABLE_TYPE");
isLinked = tableType.contains("TABLE LINK");
} else {
throw new SQLException("The table "+location+" does not exists");
}
} finally {
rs.close();
}
return isLinked;
}
/**
* @param metaData Database meta data
* @return True if the provided metadata is a h2 database connection.
* @throws SQLException
*/
public static boolean isH2DataBase(DatabaseMetaData metaData) throws SQLException {
return metaData.getDriverName().equals(H2_DRIVER_NAME);
}
/**
* @param connection Connection
* @param tableReference table identifier
* @return The integer primary key used for edition[1-n]; 0 if the source is closed or if the table has no primary
* key or more than one column as primary key
*/
public static int getIntegerPrimaryKey(Connection connection, String tableReference) throws SQLException {
if (!tableExists(connection, tableReference)) {
throw new SQLException("Table " + tableReference + " not found.");
}
final DatabaseMetaData meta = connection.getMetaData();
TableLocation tableLocation = TableLocation.parse(tableReference);
String columnNamePK = null;
ResultSet rs = meta.getPrimaryKeys(tableLocation.getCatalog(null), tableLocation.getSchema(null),
tableLocation.getTable());
try {
while (rs.next()) {
// If the schema is not specified, public must be the schema
if(!tableLocation.getSchema().isEmpty() || "public".equalsIgnoreCase(rs.getString("TABLE_SCHEM"))) {
if(columnNamePK == null) {
columnNamePK = rs.getString("COLUMN_NAME");
} else {
// Multi-column PK is not supported
columnNamePK = null;
break;
}
}
}
} finally {
rs.close();
}
if (columnNamePK != null) {
rs = meta.getColumns(tableLocation.getCatalog(null), tableLocation.getSchema(null),
tableLocation.getTable(), columnNamePK);
try {
while (rs.next()) {
if(!tableLocation.getSchema().isEmpty() || "public".equalsIgnoreCase(rs.getString("TABLE_SCHEM"))) {
int dataType = rs.getInt("DATA_TYPE");
if (dataType == Types.BIGINT || dataType == Types.INTEGER || dataType == Types.ROWID) {
return rs.getInt("ORDINAL_POSITION");
}
}
}
} finally {
rs.close();
}
}
return 0;
}
/**
* Return true if the table exists.
*
* @param connection Connection
* @param tableName Table name
* @return true if the table exists
* @throws java.sql.SQLException
*/
public static boolean tableExists(Connection connection, String tableName) throws SQLException {
try (Statement statement = connection.createStatement()) {
statement.execute("SELECT * FROM " + TableLocation.parse(tableName) + " LIMIT 0;");
return true;
} catch (SQLException ex) {
return false;
}
}
/**
* Returns the list of table names.
*
* @param metaData Database meta data
* @param catalog A catalog name. Must match the catalog name as it is stored in the database.
* "" retrieves those without a catalog; null means that the catalog name should not be used to
* narrow the search
* @param schemaPattern A schema name pattern. Must match the schema name as it is stored in the database.
* "" retrieves those without a schema.
* null means that the schema name should not be used to narrow the search
* @param tableNamePattern A table name pattern. Must match the table name as it is stored in the database
* @param types A list of table types, which must be from the list of table types returned from getTableTypes(),
* to include. null returns all types
* @return The integer primary key used for edition[1-n]; 0 if the source is closed or if the table has no primary
* key or more than one column as primary key
*/
public static List getTableNames(DatabaseMetaData metaData, String catalog, String schemaPattern,
String tableNamePattern, String [] types) throws SQLException {
List tableList = new ArrayList();
ResultSet rs = metaData.getTables(catalog, schemaPattern, tableNamePattern, types);
boolean isH2 = isH2DataBase(metaData);
try {
while (rs.next()) {
tableList.add(new TableLocation(rs).toString(isH2));
}
} finally {
rs.close();
}
return tableList;
}
/**
* Returns the list of distinct values contained by a field from a table from the database
*
* @param connection Connection
* @param tableName Name of the table containing the field.
* @param fieldName Name of the field containing the values.
* @return The list of distinct values of the field.
*/
public static List getUniqueFieldValues(Connection connection, String tableName, String fieldName) throws SQLException {
final Statement statement = connection.createStatement();
List fieldValues = new ArrayList();
try {
ResultSet result = statement.executeQuery("SELECT DISTINCT "+TableLocation.quoteIdentifier(fieldName)+" FROM "+TableLocation.parse(tableName));
while(result.next()){
fieldValues.add(result.getString(1));
}
} finally {
statement.close();
}
return fieldValues;
}
/**
* A method to create an empty table (no columns)
* @param connection Connection
* @param tableReference Table name
* @throws java.sql.SQLException
*/
public static void createEmptyTable(Connection connection, String tableReference) throws SQLException {
try (Statement statement = connection.createStatement()) {
statement.execute("CREATE TABLE "+ tableReference+ " ()");
}
}
/**
*
* @param st Statement to cancel
* @param progressVisitor Progress to link with
* @return call
* {@link org.h2gis.api.ProgressVisitor#removePropertyChangeListener(java.beans.PropertyChangeListener)}
* with this object as argument
*/
public static PropertyChangeListener attachCancelResultSet(Statement st, ProgressVisitor progressVisitor) {
PropertyChangeListener propertyChangeListener = new CancelResultSet(st);
progressVisitor.addPropertyChangeListener(ProgressVisitor.PROPERTY_CANCELED, propertyChangeListener);
return propertyChangeListener;
}
/**
* Call cancel of statement
*/
private static final class CancelResultSet implements PropertyChangeListener {
private final Statement st;
private CancelResultSet(Statement st) {
this.st = st;
}
@Override
public void propertyChange(PropertyChangeEvent evt) {
try {
st.cancel();
} catch (SQLException ex) {
// Ignore
}
}
}
}
