jdbcxydataset.html

jfreechart最新源代码

<FONT color="green">159</FONT>         * @throws SQLException if there is a problem connecting to the database.<a name="line.159"></a>
<FONT color="green">160</FONT>         */<a name="line.160"></a>
<FONT color="green">161</FONT>        public JDBCXYDataset(Connection con) throws SQLException {<a name="line.161"></a>
<FONT color="green">162</FONT>            this();<a name="line.162"></a>
<FONT color="green">163</FONT>            this.connection = con;<a name="line.163"></a>
<FONT color="green">164</FONT>        }<a name="line.164"></a>
<FONT color="green">165</FONT>    <a name="line.165"></a>
<FONT color="green">166</FONT>        /**<a name="line.166"></a>
<FONT color="green">167</FONT>         * Creates a new dataset using the specified database connection, and <a name="line.167"></a>
<FONT color="green">168</FONT>         * populates it using data obtained with the supplied query.<a name="line.168"></a>
<FONT color="green">169</FONT>         *<a name="line.169"></a>
<FONT color="green">170</FONT>         * @param con  the connection.<a name="line.170"></a>
<FONT color="green">171</FONT>         * @param query  the SQL query.<a name="line.171"></a>
<FONT color="green">172</FONT>         * <a name="line.172"></a>
<FONT color="green">173</FONT>         * @throws SQLException if there is a problem executing the query.<a name="line.173"></a>
<FONT color="green">174</FONT>         */<a name="line.174"></a>
<FONT color="green">175</FONT>        public JDBCXYDataset(Connection con, String query) throws SQLException {<a name="line.175"></a>
<FONT color="green">176</FONT>            this(con);<a name="line.176"></a>
<FONT color="green">177</FONT>            executeQuery(query);<a name="line.177"></a>
<FONT color="green">178</FONT>        }<a name="line.178"></a>
<FONT color="green">179</FONT>    <a name="line.179"></a>
<FONT color="green">180</FONT>        /**<a name="line.180"></a>
<FONT color="green">181</FONT>         * Returns &lt;code&gt;true&lt;/code&gt; if the dataset represents time series data, <a name="line.181"></a>
<FONT color="green">182</FONT>         * and &lt;code&gt;false&lt;/code&gt; otherwise.<a name="line.182"></a>
<FONT color="green">183</FONT>         * <a name="line.183"></a>
<FONT color="green">184</FONT>         * @return A boolean.<a name="line.184"></a>
<FONT color="green">185</FONT>         */<a name="line.185"></a>
<FONT color="green">186</FONT>        public boolean isTimeSeries() {<a name="line.186"></a>
<FONT color="green">187</FONT>            return this.isTimeSeries;<a name="line.187"></a>
<FONT color="green">188</FONT>        }<a name="line.188"></a>
<FONT color="green">189</FONT>    <a name="line.189"></a>
<FONT color="green">190</FONT>        /**<a name="line.190"></a>
<FONT color="green">191</FONT>         * Sets a flag that indicates whether or not the data represents a time <a name="line.191"></a>
<FONT color="green">192</FONT>         * series.<a name="line.192"></a>
<FONT color="green">193</FONT>         * <a name="line.193"></a>
<FONT color="green">194</FONT>         * @param timeSeries  the new value of the flag.<a name="line.194"></a>
<FONT color="green">195</FONT>         */<a name="line.195"></a>
<FONT color="green">196</FONT>        public void setTimeSeries(boolean timeSeries) {<a name="line.196"></a>
<FONT color="green">197</FONT>            this.isTimeSeries = timeSeries;<a name="line.197"></a>
<FONT color="green">198</FONT>        }<a name="line.198"></a>
<FONT color="green">199</FONT>    <a name="line.199"></a>
<FONT color="green">200</FONT>        /**<a name="line.200"></a>
<FONT color="green">201</FONT>         * ExecuteQuery will attempt execute the query passed to it against the<a name="line.201"></a>
<FONT color="green">202</FONT>         * existing database connection.  If no connection exists then no action<a name="line.202"></a>
<FONT color="green">203</FONT>         * is taken.<a name="line.203"></a>
<FONT color="green">204</FONT>         *<a name="line.204"></a>
<FONT color="green">205</FONT>         * The results from the query are extracted and cached locally, thus<a name="line.205"></a>
<FONT color="green">206</FONT>         * applying an upper limit on how many rows can be retrieved successfully.<a name="line.206"></a>
<FONT color="green">207</FONT>         *<a name="line.207"></a>
<FONT color="green">208</FONT>         * @param  query  the query to be executed.<a name="line.208"></a>
<FONT color="green">209</FONT>         * <a name="line.209"></a>
<FONT color="green">210</FONT>         * @throws SQLException if there is a problem executing the query.<a name="line.210"></a>
<FONT color="green">211</FONT>         */<a name="line.211"></a>
<FONT color="green">212</FONT>        public void executeQuery(String query) throws SQLException {<a name="line.212"></a>
<FONT color="green">213</FONT>            executeQuery(this.connection, query);<a name="line.213"></a>
<FONT color="green">214</FONT>        }<a name="line.214"></a>
<FONT color="green">215</FONT>    <a name="line.215"></a>
<FONT color="green">216</FONT>        /**<a name="line.216"></a>
<FONT color="green">217</FONT>         * ExecuteQuery will attempt execute the query passed to it against the<a name="line.217"></a>
<FONT color="green">218</FONT>         * provided database connection.  If connection is null then no action is <a name="line.218"></a>
<FONT color="green">219</FONT>         * taken.<a name="line.219"></a>
<FONT color="green">220</FONT>         *<a name="line.220"></a>
<FONT color="green">221</FONT>         * The results from the query are extracted and cached locally, thus<a name="line.221"></a>
<FONT color="green">222</FONT>         * applying an upper limit on how many rows can be retrieved successfully.<a name="line.222"></a>
<FONT color="green">223</FONT>         *<a name="line.223"></a>
<FONT color="green">224</FONT>         * @param  query  the query to be executed.<a name="line.224"></a>
<FONT color="green">225</FONT>         * @param  con  the connection the query is to be executed against.<a name="line.225"></a>
<FONT color="green">226</FONT>         * <a name="line.226"></a>
<FONT color="green">227</FONT>         * @throws SQLException if there is a problem executing the query.<a name="line.227"></a>
<FONT color="green">228</FONT>         */<a name="line.228"></a>
<FONT color="green">229</FONT>        public void executeQuery(Connection con, String query) <a name="line.229"></a>
<FONT color="green">230</FONT>            throws SQLException {<a name="line.230"></a>
<FONT color="green">231</FONT>    <a name="line.231"></a>
<FONT color="green">232</FONT>            if (con == null) {<a name="line.232"></a>
<FONT color="green">233</FONT>                throw new SQLException(<a name="line.233"></a>
<FONT color="green">234</FONT>                    "There is no database to execute the query."<a name="line.234"></a>
<FONT color="green">235</FONT>                );<a name="line.235"></a>
<FONT color="green">236</FONT>            }<a name="line.236"></a>
<FONT color="green">237</FONT>    <a name="line.237"></a>
<FONT color="green">238</FONT>            ResultSet resultSet = null;<a name="line.238"></a>
<FONT color="green">239</FONT>            Statement statement = null;<a name="line.239"></a>
<FONT color="green">240</FONT>            try {<a name="line.240"></a>
<FONT color="green">241</FONT>                statement = con.createStatement();<a name="line.241"></a>
<FONT color="green">242</FONT>                resultSet = statement.executeQuery(query);<a name="line.242"></a>
<FONT color="green">243</FONT>                ResultSetMetaData metaData = resultSet.getMetaData();<a name="line.243"></a>
<FONT color="green">244</FONT>    <a name="line.244"></a>
<FONT color="green">245</FONT>                int numberOfColumns = metaData.getColumnCount();<a name="line.245"></a>
<FONT color="green">246</FONT>                int numberOfValidColumns = 0;<a name="line.246"></a>
<FONT color="green">247</FONT>                int [] columnTypes = new int[numberOfColumns];<a name="line.247"></a>
<FONT color="green">248</FONT>                for (int column = 0; column &lt; numberOfColumns; column++) {<a name="line.248"></a>
<FONT color="green">249</FONT>                    try {<a name="line.249"></a>
<FONT color="green">250</FONT>                        int type = metaData.getColumnType(column + 1);<a name="line.250"></a>
<FONT color="green">251</FONT>                        switch (type) {<a name="line.251"></a>
<FONT color="green">252</FONT>    <a name="line.252"></a>
<FONT color="green">253</FONT>                            case Types.NUMERIC:<a name="line.253"></a>
<FONT color="green">254</FONT>                            case Types.REAL:<a name="line.254"></a>
<FONT color="green">255</FONT>                            case Types.INTEGER:<a name="line.255"></a>
<FONT color="green">256</FONT>                            case Types.DOUBLE:<a name="line.256"></a>
<FONT color="green">257</FONT>                            case Types.FLOAT:<a name="line.257"></a>
<FONT color="green">258</FONT>                            case Types.DECIMAL:<a name="line.258"></a>
<FONT color="green">259</FONT>                            case Types.BIT:<a name="line.259"></a>
<FONT color="green">260</FONT>                            case Types.DATE:<a name="line.260"></a>
<FONT color="green">261</FONT>                            case Types.TIME:<a name="line.261"></a>
<FONT color="green">262</FONT>                            case Types.TIMESTAMP:<a name="line.262"></a>
<FONT color="green">263</FONT>                            case Types.BIGINT:<a name="line.263"></a>
<FONT color="green">264</FONT>                            case Types.SMALLINT:<a name="line.264"></a>
<FONT color="green">265</FONT>                                ++numberOfValidColumns;<a name="line.265"></a>
<FONT color="green">266</FONT>                                columnTypes[column] = type;<a name="line.266"></a>
<FONT color="green">267</FONT>                                break;<a name="line.267"></a>
<FONT color="green">268</FONT>                            default:<a name="line.268"></a>
<FONT color="green">269</FONT>                                Log.warn(<a name="line.269"></a>
<FONT color="green">270</FONT>                                    "Unable to load column "<a name="line.270"></a>
<FONT color="green">271</FONT>                                    + column + " (" + type + ","<a name="line.271"></a>
<FONT color="green">272</FONT>                                    + metaData.getColumnClassName(column + 1) <a name="line.272"></a>
<FONT color="green">273</FONT>                                    + ")"<a name="line.273"></a>
<FONT color="green">274</FONT>                                );<a name="line.274"></a>
<FONT color="green">275</FONT>                                columnTypes[column] = Types.NULL;<a name="line.275"></a>
<FONT color="green">276</FONT>                                break;<a name="line.276"></a>
<FONT color="green">277</FONT>                        }<a name="line.277"></a>
<FONT color="green">278</FONT>                    }<a name="line.278"></a>
<FONT color="green">279</FONT>                    catch (SQLException e) {<a name="line.279"></a>
<FONT color="green">280</FONT>                        columnTypes[column] = Types.NULL;<a name="line.280"></a>
<FONT color="green">281</FONT>                        throw e;<a name="line.281"></a>
<FONT color="green">282</FONT>                    }<a name="line.282"></a>
<FONT color="green">283</FONT>                }<a name="line.283"></a>
<FONT color="green">284</FONT>    <a name="line.284"></a>
<FONT color="green">285</FONT>    <a name="line.285"></a>
<FONT color="green">286</FONT>                if (numberOfValidColumns &lt;= 1) {<a name="line.286"></a>
<FONT color="green">287</FONT>                    throw new SQLException(<a name="line.287"></a>
<FONT color="green">288</FONT>                        "Not enough valid columns where generated by query."<a name="line.288"></a>
<FONT color="green">289</FONT>                    );<a name="line.289"></a>
<FONT color="green">290</FONT>                }<a name="line.290"></a>
<FONT color="green">291</FONT>    <a name="line.291"></a>
<FONT color="green">292</FONT>                /// First column is X data<a name="line.292"></a>
<FONT color="green">293</FONT>                this.columnNames = new String[numberOfValidColumns - 1];<a name="line.293"></a>
<FONT color="green">294</FONT>                /// Get the column names and cache them.<a name="line.294"></a>
<FONT color="green">295</FONT>                int currentColumn = 0;<a name="line.295"></a>
<FONT color="green">296</FONT>                for (int column = 1; column &lt; numberOfColumns; column++) {<a name="line.296"></a>
<FONT color="green">297</FONT>                    if (columnTypes[column] != Types.NULL) {<a name="line.297"></a>
<FONT color="green">298</FONT>                        this.columnNames[currentColumn] <a name="line.298"></a>
<FONT color="green">299</FONT>                            = metaData.getColumnLabel(column + 1);<a name="line.299"></a>
<FONT color="green">300</FONT>                        ++currentColumn;<a name="line.300"></a>
<FONT color="green">301</FONT>                    }<a name="line.301"></a>
<FONT color="green">302</FONT>                }<a name="line.302"></a>
<FONT color="green">303</FONT>    <a name="line.303"></a>
<FONT color="green">304</FONT>                // Might need to add, to free memory from any previous result sets<a name="line.304"></a>
<FONT color="green">305</FONT>                if (this.rows != null) {<a name="line.305"></a>
<FONT color="green">306</FONT>                    for (int column = 0; column &lt; this.rows.size(); column++) {<a name="line.306"></a>
<FONT color="green">307</FONT>                        ArrayList row = (ArrayList) this.rows.get(column);<a name="line.307"></a>
<FONT color="green">308</FONT>                        row.clear();<a name="line.308"></a>
<FONT color="green">309</FONT>                    }<a name="line.309"></a>
<FONT color="green">310</FONT>                    this.rows.clear();<a name="line.310"></a>
<FONT color="green">311</FONT>                }<a name="line.311"></a>
<FONT color="green">312</FONT>    <a name="line.312"></a>
<FONT color="green">313</FONT>                // Are we working with a time series.<a name="line.313"></a>
<FONT color="green">314</FONT>                switch (columnTypes[0]) {<a name="line.314"></a>
<FONT color="green">315</FONT>                    case Types.DATE:<a name="line.315"></a>
<FONT color="green">316</FONT>                    case Types.TIME:<a name="line.316"></a>
<FONT color="green">317</FONT>                    case Types.TIMESTAMP:<a name="line.317"></a>
<FONT color="green">318</FONT>                        this.isTimeSeries = true;<a name="line.318"></a>
<FONT color="green">319</FONT>                        break;<a name="line.319"></a>