1 | package org.greenstone.gsdl3.sql.derby;
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2 |
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3 | import org.greenstone.gsdl3.sql.*;
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4 |
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5 |
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6 | import java.sql.Connection;
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7 | import java.sql.ResultSet;
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8 | import java.sql.ResultSetMetaData;
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9 | import java.sql.SQLException;
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10 | import java.sql.SQLWarning;
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11 | import java.sql.Statement;
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12 |
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13 | import java.util.ArrayList;
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14 | import java.util.HashMap;
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15 | import java.util.Iterator;
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16 |
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17 |
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18 | import org.greenstone.gsdl3.util.DBInfo;
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19 |
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20 | import org.apache.log4j.*;
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21 |
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22 | public class DerbyDBWrapper implements MetadataDBWrapper{
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23 | protected SQLServer sqlServer = null;
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24 | protected SQLStatements sqlState = null;
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25 | protected Connection connection = null;
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26 | protected Statement statement = null;
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27 | protected static Logger logger = Logger.getLogger(org.greenstone.gsdl3.sql.derby.DerbyDBWrapper.class.getName());
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28 |
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29 |
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30 | public DBInfo getInfo(String id){
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31 | if(sqlState == null) return null;
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32 | String dbInfoState = sqlState.getDBInfoStatement(id);
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33 | ArrayList result = executeQuery(dbInfoState);
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34 | if (result.size() == 0) return null;
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35 | DBInfo info = new DBInfo();
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36 | for(int i=0; i<result.size();i++){
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37 | HashMap arow = (HashMap)result.get(i);
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38 | Iterator ite = arow.keySet().iterator();
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39 | while(ite.hasNext()){
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40 | String key = (String)ite.next();
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41 | Object value = arow.get(key);
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42 | //logger.info(key + "=>" +value);
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43 | if (value == null || value.equals("")) continue;
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44 | info.addInfo(key.toLowerCase(),sqlState.undoDBSafe(value));
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45 | }
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46 | }
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47 |
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48 | return info;
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49 | }
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50 |
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51 | public void setSQLServer(SQLServer server){
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52 | sqlServer = server;
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53 | }
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54 |
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55 | public void setSQLStatements(SQLStatements state){
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56 | sqlState = state;
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57 | }
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58 |
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59 | public boolean openConnection(String databasepath){
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60 | connection = sqlServer.connect(databasepath);
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61 |
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62 | if (connection == null) return false;
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63 |
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64 | try{
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65 | connection.setAutoCommit(false);
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66 | statement = connection.createStatement();
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67 | }
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68 | catch(SQLException sqle){
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69 | logger.debug("Database Error occured when creating a statement object",sqle);
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70 | return false;
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71 | }
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72 | return true;
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73 | }
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74 |
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75 | public boolean openAndCreateConnection(String databasepath){
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76 | connection = sqlServer.connectAndCreate(databasepath);
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77 |
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78 | if (connection == null) {
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79 | logger.error("sql connection is null. database path="+databasepath);
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80 | return false;
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81 | }
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82 |
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83 | try{
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84 | connection.setAutoCommit(true);
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85 | //by passing the two arguments, the ResultSet returned from executeQuery is updatable
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86 | statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
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87 | if (statement == null) {
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88 | logger.error("statement is null");
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89 | return false;
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90 | }
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91 |
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92 | }
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93 | catch(SQLException sqle){
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94 | logger.debug("Database Error occured when creating a statement object",sqle);
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95 | return false;
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96 | }
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97 | return true;
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98 | }
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99 |
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100 | public synchronized ArrayList executeQuery(String query_statement){
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101 | //the database hasn't been correct yet
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102 | ArrayList results = new ArrayList();
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103 | try{
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104 |
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105 | if (statement == null){
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106 | logger.info("the database hasn't been correct yet");
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107 | return new ArrayList();
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108 | }
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109 |
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110 | ResultSet rs = statement.executeQuery(query_statement);
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111 | ResultSetMetaData rsmd = rs.getMetaData();
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112 | int numOfColumns = rsmd.getColumnCount();
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113 | while(rs.next()){
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114 | HashMap arow = new HashMap();
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115 | for(int i = 1; i <= numOfColumns ; i++){
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116 | arow.put(rsmd.getColumnName(i).toLowerCase(), rs.getObject(i));
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117 | }
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118 | results.add(arow);
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119 | }
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120 | }
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121 | catch(SQLException sqle){
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122 | logger.debug("Database Error occured when executeQuery " + query_statement,sqle);
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123 | return results;
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124 | }
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125 | catch(Exception e){
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126 | logger.debug(e);
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127 | return null;
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128 | }
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129 | return results;
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130 | }
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131 | /**
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132 | * Same as executeQuery except the return type is ResultSet
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133 | * @param stat
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134 | * @return ResultSet of querying the statement 'stat'
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135 | */
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136 | public synchronized ResultSet queryResultSet(String stat){
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137 | ResultSet rs = null;
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138 | try{
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139 | if (statement == null){
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140 | logger.info("Null sql statement provided.");
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141 | return null;
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142 | }
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143 | logger.debug(stat);
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144 | rs = statement.executeQuery(stat);
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145 |
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146 | logger.info("sql stat="+stat+ " result="+rs);
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147 | }
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148 | catch(SQLException sqle){
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149 | logger.info("Database Error occured when execute query " + stat, sqle);
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150 | return null;
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151 | }
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152 | catch(Exception e){
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153 | logger.info("Exception="+e);
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154 | return null;
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155 | }
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156 | logger.debug(" result="+rs);
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157 | return rs;
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158 | }
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159 | /**
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160 | * Used by create (table)
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161 | */
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162 | public synchronized boolean execute(String stat) {
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163 | boolean rs;
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164 | try{
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165 | if (statement == null){
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166 | logger.info("statement is null.");
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167 | return false;
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168 | }
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169 |
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170 | rs = statement.execute(stat);
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171 | // connection.commit();
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172 | }
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173 | catch(SQLException sqle){
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174 | logger.debug("Database Error occured when execute query " + stat, sqle);
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175 | return false;
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176 | }
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177 | catch(Exception e){
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178 | logger.debug(e);
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179 | return false;
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180 | }
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181 | return rs;
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182 | }
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183 | /**
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184 | * Used by insert, update, and delete
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185 | */
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186 | public synchronized boolean executeUpdate(String stat) {
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187 | int rs;
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188 | try{
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189 | if (statement == null){
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190 | logger.info("statement is null.");
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191 | return false;
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192 | }
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193 |
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194 | //either the row count of INSERT, UPDATE OR DELETE statement, or 0 if the statement returns nothing
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195 | rs = statement.executeUpdate(stat);
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196 | // connection.commit();
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197 | logger.info("sql stat="+stat+ " result="+rs);
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198 | }
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199 | catch(SQLException sqle){
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200 | logger.info("Database Error occured when execute query " + stat, sqle);
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201 | return false;
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202 | }
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203 | catch(Exception e){
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204 | logger.info("Exception="+e);
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205 | return false;
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206 | }
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207 | logger.info(" result="+rs);
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208 | return (rs==-1)? false : true;
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209 | }
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210 | /**
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211 | * Used by checking the existence of table
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212 | * Same as the method 'execute' except throws SQLException
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213 | */
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214 | public void check4Table(String stat) throws SQLException {
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215 | statement.executeQuery(stat);
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216 | }
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217 |
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218 | public void closeConnection(String databasepath){
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219 | sqlServer.disconnect(databasepath);
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220 | }
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221 |
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222 | } |
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