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/*
* Copyright (c) 2007 David Crawshaw
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package org.sqlite.core;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.regex.Pattern;
import org.sqlite.SQLiteConnection;
public abstract class CoreDatabaseMetaData implements DatabaseMetaData
{
protected SQLiteConnection conn;
protected PreparedStatement
getTables = null, getTableTypes = null,
getTypeInfo = null, getCatalogs = null,
getSchemas = null, getUDTs = null,
getColumnsTblName = null, getSuperTypes = null,
getSuperTables = null, getTablePrivileges = null,
getIndexInfo = null, getProcedures = null,
getProcedureColumns = null, getAttributes = null,
getBestRowIdentifier = null, getVersionColumns = null,
getColumnPrivileges = null;
/**
* Used to save generating a new statement every call.
*/
protected PreparedStatement getGeneratedKeys = null;
/**
* Constructor that applies the Connection object.
* @param conn Connection object.
*/
protected CoreDatabaseMetaData(SQLiteConnection conn) {
this.conn = conn;
}
public abstract ResultSet getGeneratedKeys() throws SQLException;
/**
* @throws SQLException
*/
protected void checkOpen() throws SQLException {
if (conn == null) {
throw new SQLException("connection closed");
}
}
/**
* @throws SQLException
*/
public synchronized void close() throws SQLException {
if (conn == null) {
return;
}
try {
if (getTables != null) {
getTables.close();
}
if (getTableTypes != null) {
getTableTypes.close();
}
if (getTypeInfo != null) {
getTypeInfo.close();
}
if (getCatalogs != null) {
getCatalogs.close();
}
if (getSchemas != null) {
getSchemas.close();
}
if (getUDTs != null) {
getUDTs.close();
}
if (getColumnsTblName != null) {
getColumnsTblName.close();
}
if (getSuperTypes != null) {
getSuperTypes.close();
}
if (getSuperTables != null) {
getSuperTables.close();
}
if (getTablePrivileges != null) {
getTablePrivileges.close();
}
if (getIndexInfo != null) {
getIndexInfo.close();
}
if (getProcedures != null) {
getProcedures.close();
}
if (getProcedureColumns != null) {
getProcedureColumns.close();
}
if (getAttributes != null) {
getAttributes.close();
}
if (getBestRowIdentifier != null) {
getBestRowIdentifier.close();
}
if (getVersionColumns != null) {
getVersionColumns.close();
}
if (getColumnPrivileges != null) {
getColumnPrivileges.close();
}
if (getGeneratedKeys != null) {
getGeneratedKeys.close();
}
getTables = null;
getTableTypes = null;
getTypeInfo = null;
getCatalogs = null;
getSchemas = null;
getUDTs = null;
getColumnsTblName = null;
getSuperTypes = null;
getSuperTables = null;
getTablePrivileges = null;
getIndexInfo = null;
getProcedures = null;
getProcedureColumns = null;
getAttributes = null;
getBestRowIdentifier = null;
getVersionColumns = null;
getColumnPrivileges = null;
getGeneratedKeys = null;
}
finally {
conn = null;
}
}
/**
* Adds SQL string quotes to the given string.
* @param tableName The string to quote.
* @return The quoted string.
*/
protected static String quote(String tableName) {
if (tableName == null) {
return "null";
}
else {
return String.format("'%s'", tableName);
}
}
/**
* Applies SQL escapes for special characters in a given string.
* @param val The string to escape.
* @return The SQL escaped string.
*/
protected String escape(final String val) {
// TODO: this function is ugly, pass this work off to SQLite, then we
// don't have to worry about Unicode 4, other characters needing
// escaping, etc.
int len = val.length();
StringBuilder buf = new StringBuilder(len);
for (int i = 0; i < len; i++) {
if (val.charAt(i) == '\'') {
buf.append('\'');
}
buf.append(val.charAt(i));
}
return buf.toString();
}
// inner classes
/**
* Pattern used to extract column order for an unnamed primary key.
*/
protected final static Pattern PK_UNNAMED_PATTERN =
Pattern.compile(".*\\sPRIMARY\\s+KEY\\s+\\((.*?,+.*?)\\).*",
Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
/**
* Pattern used to extract a named primary key.
*/
protected final static Pattern PK_NAMED_PATTERN =
Pattern.compile(".*\\sCONSTRAINT\\s+(.*?)\\s+PRIMARY\\s+KEY\\s+\\((.*?)\\).*",
Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
/**
* @see java.lang.Object#finalize()
*/
protected void finalize() throws Throwable {
close();
}
}
