102 lines
2.4 KiB
Java
102 lines
2.4 KiB
Java
package org.hwo.pulscounter.db;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import org.hwo.pulscounter.SnapShot;
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import static org.hwo.logging.Logging.*;
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import static org.hwo.logging.LogLevel.*;
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public class PulsCounterDatabase {
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private Connection dbConnection;
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public PulsCounterDatabase(){
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try {
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getClass().getClassLoader().loadClass("org.hsqldb.jdbcDriver");
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dbConnection = DriverManager.getConnection("jdbc:hsqldb:file:synololog-hsql", "SA", "");
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} catch (SQLException e) {
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e.printStackTrace();
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} catch (ClassNotFoundException e) {
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log(ERROR,"HyperSQL Driver could not be loaded. [%s]",e.toString());
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}
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}
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public void close(){
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try {
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dbConnection.close();
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} catch (SQLException e) {
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log(ERROR,"Exception while closing database: %s",e.toString());
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}
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}
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private ResultSet executeSimpleSQL(String query,Object... args){
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try {
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PreparedStatement stmt = dbConnection.prepareStatement(query);
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for (int i=0;i<args.length;i++){
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stmt.setObject(i+1, args[i]);
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}
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stmt.execute();
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ResultSet result = stmt.getResultSet();
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stmt.closeOnCompletion();
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return result;
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} catch (SQLException e) {
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log(ERROR,"SQL Statement failed: %s",query);
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log(ERROR,"Exception: %s", e.toString());
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}
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return null;
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}
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private String executeVerySimpleQuery(String query,Object... args){
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ResultSet result = executeSimpleSQL(query,args);
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if (result != null){
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try {
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if (result.next()){
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return result.getString(1);
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}
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} catch (SQLException e) {
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log(ERROR,"SQL Statement failed: %s",query);
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log(ERROR,"Exception: %s", e.toString());
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}
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}
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return null;
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}
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public String getProperty(String name){
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return executeVerySimpleQuery("SELECT value FROM properties WHERE name=?", name);
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}
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public void setProperty(String name,String value){
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executeSimpleSQL("MERGE INTO properties USING (VALUES(?,?)) as p(name,value) ON properties.name = p.name WHEN MATCHED THEN UPDATE SET properties.value = p.value WHEN NOT MATCHED THEN INSERT VALUES uuid(), p.name, p.value", name,value);
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}
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public void removeProperty(String name){
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executeSimpleSQL("DELETE FROM properties WHERE properties.name = ?", name);
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}
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public String getSchemaVersion(){
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return getProperty("db.schema.version");
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}
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public void storeSnapshots(SnapShot[] snapShots){
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}
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}
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