DSA-Python-Cap06-01-Criando um Banco de Dados SQLite-checkpoint.ipynb

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  {
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   "metadata": {},
   "source": [
    "# <font color='blue'>Data Science Academy - Python Fundamentos - Capítulo 6</font>\n",
    "\n",
    "## Download: http://github.com/dsacademybr"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Versão da Linguagem Python\n",
    "from platform import python_version\n",
    "print('Versão da Linguagem Python Usada Neste Jupyter Notebook:', python_version())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Documentação SQLite: http://www.sqlite.org/docs.html"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Acessando Banco de Dados com Python"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Reemove o arquivo com o banco de dados SQLite (caso exista)\n",
    "import os\n",
    "os.remove(\"escola.db\") if os.path.exists(\"escola.db\") else None"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Importando o módulo de acesso ao SQLite\n",
    "import sqlite3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Cria uma conexão com o banco de dados. \n",
    "# Se o banco de dados não existir, ele é criado neste momento.\n",
    "con = sqlite3.connect('escola.db')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "type(con)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Criando um cursor \n",
    "# (Um cursor permite percorrer todos os registros em um conjunto de dados)\n",
    "cur = con.cursor()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "type(cur)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Cria uma instrução sql\n",
    "sql_create = 'create table cursos '\\\n",
    "'(id integer primary key, '\\\n",
    "'titulo varchar(100), '\\\n",
    "'categoria varchar(140))'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Executando a instrução sql no cursor\n",
    "cur.execute(sql_create)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Criando outra sentença SQL para inserir registros\n",
    "sql_insert = 'insert into cursos values (?, ?, ?)'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Dados\n",
    "recset = [(1000, 'Ciência de Dados', 'Data Science'),\n",
    "          (1001, 'Big Data Fundamentos', 'Big Data'),\n",
    "          (1002, 'Python Fundamentos', 'Análise de Dados')]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Inserindo os registros\n",
    "for rec in recset:\n",
    "    cur.execute(sql_insert, rec)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Grava a transação\n",
    "con.commit()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Criando outra sentença SQL para selecionar registros\n",
    "sql_select = 'select * from cursos'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Seleciona todos os registros e recupera os registros\n",
    "cur.execute(sql_select)\n",
    "dados = cur.fetchall()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Mostra\n",
    "for linha in dados:\n",
    "    print ('Curso Id: %d, Título: %s, Categoria: %s \\n' % linha)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Gerando outros registros\n",
    "recset = [(1003, 'Gestão de Dados com MongoDB', 'Big Data'),\n",
    "          (1004, 'R Fundamentos', 'Análise de Dados')]\n",
    "\n",
    "# Inserindo os registros\n",
    "for rec in recset:\n",
    "    cur.execute(sql_insert, rec)\n",
    "    \n",
    "# Gravando a transação\n",
    "con.commit()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Seleciona todos os registros\n",
    "cur.execute('select * from cursos')\n",
    "\n",
    "# Recupera os resultados\n",
    "recset = cur.fetchall()\n",
    "\n",
    "# Mostra\n",
    "for rec in recset:\n",
    "    print ('Curso Id: %d, Título: %s, Categoria: %s \\n' % rec)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Fecha a conexão\n",
    "con.close()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Fim"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Obrigado - Data Science Academy - <a href=\"http://facebook.com/dsacademybr\">facebook.com/dsacademybr</a>"
   ]
  }
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