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/*
* Copyright 2004-2010 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.server.web;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import org.h2.command.Parser;
import org.h2.util.New;
import org.h2.util.StringUtils;
/**
* Keeps meta data information about a database.
* This class is used by the H2 Console.
*/
public class DbContents {
/**
* The list of schemas.
*/
DbSchema[] schemas;
/**
* The default schema.
*/
DbSchema defaultSchema;
/**
* True if this is an Oracle database.
*/
boolean isOracle;
/**
* True if this is a H2 database.
*/
boolean isH2;
/**
* True if this is a H2 database in MySQL mode.
*/
boolean isH2ModeMySQL;
/**
* True if this is a PostgreSQL database.
*/
boolean isPostgreSQL;
/**
* True if this is a MySQL database.
*/
boolean isMySQL;
/**
* True if this is an Apache Derby database.
*/
boolean isDerby;
/**
* True if this is a Firebird database.
*/
boolean isFirebird;
/**
* True if this is an SQLite database.
*/
boolean isSQLite;
/**
* True if the unquoted names are stored as upper case.
* False for MySQL and PostgreSQL.
*/
boolean storedUpperCaseIdentifiers;
/**
* Get the column index of a column in a result set. If the column is not
* found, the default column index is returned.
* This is a workaround for a JDBC-ODBC bridge problem.
*
* @param rs the result set
* @param columnName the column name
* @param defaultColumnIndex the default column index
* @return the column index
*/
static int findColumn(ResultSet rs, String columnName, int defaultColumnIndex) {
try {
return rs.findColumn(columnName);
} catch (SQLException e) {
return defaultColumnIndex;
}
}
/**
* Read the contents of this database from the database meta data.
*
* @param meta the database meta data
*/
void readContents(DatabaseMetaData meta) throws SQLException {
String prod = StringUtils.toLowerEnglish(meta.getDatabaseProductName());
isSQLite = prod.indexOf("sqlite") >= 0;
String url = meta.getURL();
if (url != null) {
isH2 = url.startsWith("jdbc:h2:");
if (isH2) {
Statement stat = meta.getConnection().createStatement();
ResultSet rs = stat.executeQuery(
"SELECT UPPER(VALUE) FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME='MODE'");
rs.next();
if ("MYSQL".equals(rs.getString(1))) {
isH2ModeMySQL = true;
}
rs.close();
stat.close();
}
isOracle = url.startsWith("jdbc:oracle:");
isPostgreSQL = url.startsWith("jdbc:postgresql:");
// isHSQLDB = url.startsWith("jdbc:hsqldb:");
isMySQL = url.startsWith("jdbc:mysql:");
isDerby = url.startsWith("jdbc:derby:");
isFirebird = url.startsWith("jdbc:firebirdsql:");
}
storedUpperCaseIdentifiers = meta.storesUpperCaseIdentifiers();
String defaultSchemaName = getDefaultSchemaName(meta);
String[] schemaNames = getSchemaNames(meta);
schemas = new DbSchema[schemaNames.length];
for (int i = 0; i < schemaNames.length; i++) {
String schemaName = schemaNames[i];
boolean isDefault = defaultSchemaName == null || defaultSchemaName.equals(schemaName);
DbSchema schema = new DbSchema(this, schemaName, isDefault);
if (schema.isDefault) {
defaultSchema = schema;
}
schemas[i] = schema;
String[] tableTypes = { "TABLE", "SYSTEM TABLE", "VIEW", "SYSTEM VIEW",
"TABLE LINK", "SYNONYM" };
schema.readTables(meta, tableTypes);
}
if (defaultSchema == null) {
String best = null;
for (DbSchema schema : schemas) {
if ("dbo".equals(schema.name)) {
// MS SQL Server
defaultSchema = schema;
break;
}
if (defaultSchema == null || best == null || schema.name.length() < best.length()) {
best = schema.name;
defaultSchema = schema;
}
}
}
}
private String[] getSchemaNames(DatabaseMetaData meta) throws SQLException {
if (isMySQL) {
return new String[] { "" };
} else if (isFirebird) {
return new String[] { null };
}
ResultSet rs = meta.getSchemas();
ArrayList schemaList = New.arrayList();
while (rs.next()) {
String schema = rs.getString(findColumn(rs, "TABLE_SCHEM", 1));
if (isOracle) {
for (String ignore : new String[] {
"CTXSYS", "DIP", "DBSNMP", "DMSYS", "EXFSYS", "MDDATA", "MDSYS",
"MGMT_VIEW", "OLAPSYS", "ORDSYS", "ORDPLUGINS", "OUTLN", "SI_INFORMTN_SCHEMA", "SYS", "SYSMAN",
"SYSTEM", "TSMSYS", "WMSYS", "XDB"
}) {
if (ignore.equals(schema)) {
schema = null;
break;
}
}
}
if (schema == null) {
continue;
}
schemaList.add(schema);
}
rs.close();
String[] list = new String[schemaList.size()];
schemaList.toArray(list);
return list;
}
private String getDefaultSchemaName(DatabaseMetaData meta) {
String defaultSchemaName = "";
try {
if (isOracle) {
return meta.getUserName();
} else if (isPostgreSQL) {
return "public";
} else if (isMySQL) {
return "";
} else if (isDerby) {
return StringUtils.toUpperEnglish(meta.getUserName());
} else if (isFirebird) {
return null;
}
ResultSet rs = meta.getSchemas();
int index = rs.findColumn("IS_DEFAULT");
while (rs.next()) {
if (rs.getBoolean(index)) {
defaultSchemaName = rs.getString("TABLE_SCHEM");
}
}
} catch (SQLException e) {
// IS_DEFAULT not found
}
return defaultSchemaName;
}
/**
* Add double quotes around an identifier if required.
* For the H2 database, all identifiers are quoted.
*
* @param identifier the identifier
* @return the quoted identifier
*/
String quoteIdentifier(String identifier) {
if (identifier == null) {
return null;
}
if (isH2 && !isH2ModeMySQL) {
return Parser.quoteIdentifier(identifier);
}
return StringUtils.toUpperEnglish(identifier);
}
/**
* Check whether an identifier from the database meta data needs to be
* quoted. This depends on how the database stores the identifiers ("test"
* doesn't need to be quoted if the database stores identifiers lowercase)
*
* @param identifier the identifier
* @return true if the identifier needs to be quoted
*/
boolean needsQuotes(String identifier) {
if (storedUpperCaseIdentifiers) {
if (identifier.equals(identifier.toUpperCase())) {
return false;
}
} else {
if (identifier.equals(identifier.toLowerCase())) {
return false;
}
}
return true;
}
}
