Move Sqlite wrapper class from Osmium in here.

The wrapper never fit into Osmium. So we'll put it here. Also there was an
example program in Osmium to test the Statistics handler. This has moved
here now, too (osmstats).

1 files changed, 195 insertions, 0 deletions

diff --git a/tagstats/sqlite.hpp b/tagstats/sqlite.hpp
new file mode 100644
index 0000000..fac6bcf
--- /dev/null
+++ b/tagstats/sqlite.hpp
@@ -0,0 +1,195 @@
+#ifndef TAGSTATS_SQLITE_HPP
+#define TAGSTATS_SQLITE_HPP
+
+/*
+
+Copyright 2012 Jochen Topf <jochen@topf.org> and others (see README).
+
+This file is part of Taginfo (https://github.com/joto/taginfo).
+
+Osmium is free software: you can redistribute it and/or modify it under the
+terms of the GNU Lesser General Public License or (at your option) the GNU
+General Public License as published by the Free Software Foundation, either
+version 3 of the Licenses, or (at your option) any later version.
+
+Osmium is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU Lesser General Public License and the GNU
+General Public License for more details.
+
+You should have received a copy of the Licenses along with Osmium. If not, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+#include <iostream>
+#include <stdexcept>
+#include <stdint.h>
+#include <string>
+
+#include <sqlite3.h>
+
+/**
+*  @brief The %Sqlite classes wrap the %Sqlite C library.
+*/
+namespace Sqlite {
+
+    /**
+    *  Exception returned by Sqlite wrapper classes when there are errors in the Sqlite3 lib
+    */
+    class Exception : public std::runtime_error {
+
+    public:
+
+        Exception(const std::string& msg, const std::string& error) :
+            std::runtime_error(msg + ": " + error + '\n') {
+        }
+
+    };
+
+    class Statement;
+
+    /**
+    *  Wrapper class for Sqlite database
+    */
+    class Database {
+
+    private:
+
+        sqlite3* m_db;
+
+    public:
+
+        Database(const char* filename) {
+            if (sqlite3_open_v2(filename, &m_db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, 0)) {
+                sqlite3_close(m_db);
+                throw Sqlite::Exception("Can't open database", errmsg());
+            }
+        }
+
+        ~Database() {
+            sqlite3_close(m_db);
+        }
+
+        const std::string& errmsg() const {
+            static std::string error = std::string(sqlite3_errmsg(m_db));
+            return error;
+        }
+
+        sqlite3* get_sqlite3() {
+            return m_db;
+        }
+
+        void begin_transaction() {
+            if (SQLITE_OK != sqlite3_exec(m_db, "BEGIN TRANSACTION;", 0, 0, 0)) {
+                std::cerr << "Database error: " << sqlite3_errmsg(m_db) << "\n";
+                sqlite3_close(m_db);
+                throw std::runtime_error("Sqlite error");
+            }
+        }
+
+        void commit() {
+            if (SQLITE_OK != sqlite3_exec(m_db, "COMMIT;", 0, 0, 0)) {
+                std::cerr << "Database error: " << sqlite3_errmsg(m_db) << "\n";
+                sqlite3_close(m_db);
+                throw std::runtime_error("Sqlite error");
+            }
+        }
+
+        Statement* prepare(const char* sql);
+
+    }; // class Database
+
+    /**
+    * Wrapper class for Sqlite prepared statement.
+    */
+    class Statement {
+
+    private:
+
+        Database* m_db;
+        sqlite3_stmt* m_statement;
+        int m_bindnum;
+
+    public:
+
+        Statement(Database* db, const char* sql) :
+            m_db(db),
+            m_statement(0),
+            m_bindnum(1) {
+            sqlite3_prepare_v2(db->get_sqlite3(), sql, -1, &m_statement, 0);
+            if (m_statement == 0) {
+                throw Sqlite::Exception("Can't prepare statement", m_db->errmsg());
+            }
+        }
+
+        ~Statement() {
+            sqlite3_finalize(m_statement);
+        }
+
+        Statement* bind_null() {
+            if (SQLITE_OK != sqlite3_bind_null(m_statement, m_bindnum++)) {
+                throw Sqlite::Exception("Can't bind null value", m_db->errmsg());
+            }
+            return this;
+        }
+
+        Statement* bind_text(const char* value) {
+            if (SQLITE_OK != sqlite3_bind_text(m_statement, m_bindnum++, value, -1, SQLITE_STATIC)) {
+                throw Sqlite::Exception("Can't bind text value", m_db->errmsg());
+            }
+            return this;
+        }
+
+        Statement* bind_text(const std::string& value) {
+            if (SQLITE_OK != sqlite3_bind_text(m_statement, m_bindnum++, value.c_str(), -1, SQLITE_STATIC)) {
+                throw Sqlite::Exception("Can't bind text value", m_db->errmsg());
+            }
+            return this;
+        }
+
+        Statement* bind_int(int value) {
+            if (SQLITE_OK != sqlite3_bind_int(m_statement, m_bindnum++, value)) {
+                throw Sqlite::Exception("Can't bind int value", m_db->errmsg());
+            }
+            return this;
+        }
+
+        Statement* bind_int64(int64_t value) {
+            if (SQLITE_OK != sqlite3_bind_int64(m_statement, m_bindnum++, value)) {
+                throw Sqlite::Exception("Can't bind int64 value", m_db->errmsg());
+            }
+            return this;
+        }
+
+        Statement* bind_double(double value) {
+            if (SQLITE_OK != sqlite3_bind_double(m_statement, m_bindnum++, value)) {
+                throw Sqlite::Exception("Can't bind double value", m_db->errmsg());
+            }
+            return this;
+        }
+
+        Statement* bind_blob(const void* value, int length) {
+            if (SQLITE_OK != sqlite3_bind_blob(m_statement, m_bindnum++, value, length, 0)) {
+                throw Sqlite::Exception("Can't bind blob value", m_db->errmsg());
+            }
+            return this;
+        }
+
+        void execute() {
+            sqlite3_step(m_statement);
+            if (SQLITE_OK != sqlite3_reset(m_statement)) {
+                throw Sqlite::Exception("Can't execute statement", m_db->errmsg());
+            }
+            m_bindnum = 1;
+        }
+
+    }; // class Statement
+
+    inline Statement* Database::prepare(const char* sql) {
+        return new Statement(this, sql);
+    }
+
+} // namespace Sqlite
+
+#endif // TAGSTATS_SQLITE_HPP