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Add Webquery example
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‎.gitignore‎

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.DS_Store

‎examples/sqlite3_webquery/data/babyname.db‎

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‎examples/sqlite3_webquery/sqlite3_webquery.ino‎

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/*
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This example shows how to retrieve data from Sqlite3 databases from SD Card
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through the Web Server and display in the form of HTML page.
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It also demonstrates query filtering by parameter passing and chunked encoding.
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Before running please copy following files to SD Card:
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data/babyname.db
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This database contains around 30000 baby names and corresponding data.
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For more information, visit https://github.com/siara-cc/esp32_arduino_sqlite3_lib
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Copyright (c) 2018, Siara Logics (cc)
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*/
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/*
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Copyright (c) 2015, Majenko Technologies
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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* * Neither the name of Majenko Technologies nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <WiFi.h>
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#include <WiFiClient.h>
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#include <WebServer.h>
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#include <ESPmDNS.h>
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#include <sqlite3.h>
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#include <FS.h>
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#include "SD_MMC.h"
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const char *ssid = "Nokia1";
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const char *password = "nokiafour";
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WebServer server(80);
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const int led = 13;
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void handleRoot() {
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digitalWrite ( led, 1 );
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String temp;
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int sec = millis() / 1000;
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int min = sec / 60;
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int hr = min / 60;
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temp = "<html><head>\
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<title>ESP32 Demo</title>\
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<style>\
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body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; font-size: large; Color: #000088; }\
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</style>\
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</head>\
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<body>\
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<h1>Hello from ESP32!</h1>\
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<p>Uptime: ";
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temp += hr;
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temp += ":";
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temp += min % 60;
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temp += ":";
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temp += sec % 60;
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temp += "</p>\
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<h2>Query gendered names database</h2>\
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<form name='params' method='GET' action='query_db'>\
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Enter from: <input type=text style='font-size: large' value='Bob' name='from'/> \
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<br>to: <input type=text style='font-size: large' value='Bobby' name='to'/> \
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<br><br><input type=submit style='font-size: large' value='Query database'/>\
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</form>\
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</body>\
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</html>";
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server.send ( 200, "text/html", temp.c_str() );
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digitalWrite ( led, 0 );
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}
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void handleNotFound() {
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digitalWrite ( led, 1 );
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String message = "File Not Found\n\n";
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message += "URI: ";
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message += server.uri();
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message += "\nMethod: ";
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message += ( server.method() == HTTP_GET ) ? "GET" : "POST";
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message += "\nArguments: ";
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message += server.args();
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message += "\n";
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for ( uint8_t i = 0; i < server.args(); i++ ) {
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message += " " + server.argName ( i ) + ": " + server.arg ( i ) + "\n";
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}
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server.send ( 404, "text/plain", message );
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digitalWrite ( led, 0 );
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}
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sqlite3 *db1;
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int rc;
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sqlite3_stmt *res;
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int rec_count = 0;
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const char *tail;
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int openDb(const char *filename, sqlite3 **db) {
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int rc = sqlite3_open(filename, db);
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if (rc) {
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Serial.printf("Can't open database: %s\n", sqlite3_errmsg(*db));
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return rc;
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} else {
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Serial.printf("Opened database successfully\n");
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}
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return rc;
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}
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void setup ( void ) {
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pinMode(led, OUTPUT);
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digitalWrite(led, 0);
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Serial.begin(115200);
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WiFi.mode(WIFI_STA);
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WiFi.begin(ssid, password);
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Serial.println("");
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// Wait for connection
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while ( WiFi.status() != WL_CONNECTED ) {
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delay ( 500 );
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Serial.print ( "." );
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}
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Serial.println ( "" );
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Serial.print ( "Connected to " );
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Serial.println ( ssid );
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Serial.print ( "IP address: " );
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Serial.println ( WiFi.localIP() );
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if ( MDNS.begin ( "esp32" ) ) {
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Serial.println ( "MDNS responder started" );
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}
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SD_MMC.begin();
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sqlite3_initialize();
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// Open database
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if (openDb("/sdcard/babyname.db", &db1))
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return;
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server.on ( "/", handleRoot );
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server.on ( "/query_db", []() {
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String sql = "Select count(*) from gendered_names where name between '";
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sql += server.arg("from");
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sql += "' and '";
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sql += server.arg("to");
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sql += "'";
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rc = sqlite3_prepare_v2(db1, sql.c_str(), 1000, &res, &tail);
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if (rc != SQLITE_OK) {
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String resp = "Failed to fetch data: ";
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resp += sqlite3_errmsg(db1);
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resp += ".<br><br><input type=button onclick='location.href=\"/\"' value='back'/>";
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server.send ( 200, "text/html", resp.c_str());
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Serial.println(resp.c_str());
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return;
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}
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while (sqlite3_step(res) == SQLITE_ROW) {
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rec_count = sqlite3_column_int(res, 0);
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if (rec_count > 5000) {
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String resp = "Too many records: ";
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resp += rec_count;
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resp += ". Please select different range";
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resp += ".<br><br><input type=button onclick='location.href=\"/\"' value='back'/>";
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server.send ( 200, "text/html", resp.c_str());
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Serial.println(resp.c_str());
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sqlite3_finalize(res);
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return;
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}
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}
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sqlite3_finalize(res);
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sql = "Select year, state, name, total_babies, primary_sex, primary_sex_ratio, per_100k_in_state from gendered_names where name between '";
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sql += server.arg("from");
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sql += "' and '";
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sql += server.arg("to");
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sql += "'";
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rc = sqlite3_prepare_v2(db1, sql.c_str(), 1000, &res, &tail);
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if (rc != SQLITE_OK) {
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String resp = "Failed to fetch data: ";
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resp += sqlite3_errmsg(db1);
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resp += "<br><br><a href='/'>back</a>";
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server.send ( 200, "text/html", resp.c_str());
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Serial.println(resp.c_str());
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return;
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}
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rec_count = 0;
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server.setContentLength(CONTENT_LENGTH_UNKNOWN);
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String resp = "<html><head><title>ESP32 Sqlite local database query through web server</title>\
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<style>\
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body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; font-size: large; Color: #000088; }\
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</style><head><body><h1>ESP32 Sqlite local database query through web server</h1><h2>";
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resp += sql;
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resp += "</h2><br><table cellspacing='1' cellpadding='1' border='1'><tr><td>Year</td><td>State</td><td>Name</td><td>Total babies</td><td>Primary Sex</td><td>Ratio</td><td>Per 100k</td></tr>";
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server.send ( 200, "text/html", resp.c_str());
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while (sqlite3_step(res) == SQLITE_ROW) {
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resp = "<tr><td>";
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resp += sqlite3_column_int(res, 0);
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resp += "</td><td>";
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resp += (const char *) sqlite3_column_text(res, 1);
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resp += "</td><td>";
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resp += (const char *) sqlite3_column_text(res, 2);
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resp += "</td><td>";
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resp += sqlite3_column_int(res, 3);
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resp += "</td><td>";
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resp += (const char *) sqlite3_column_text(res, 4);
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resp += "</td><td>";
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resp += sqlite3_column_double(res, 5);
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resp += "</td><td>";
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resp += sqlite3_column_double(res, 6);
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resp += "</td></tr>";
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server.sendContent(resp);
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rec_count++;
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}
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resp = "</table><br><br>Number of records: ";
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resp += rec_count;
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resp += ".<br><br><input type=button onclick='location.href=\"/\"' value='back'/>";
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server.sendContent(resp);
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sqlite3_finalize(res);
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} );
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server.onNotFound ( handleNotFound );
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server.begin();
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Serial.println ( "HTTP server started" );
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}
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void loop ( void ) {
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server.handleClient();
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}

‎output_web_1.png‎

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‎output_web_2.png‎

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‎siara_cc_visiting_card.png‎

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