{"id":335,"date":"2020-10-31T15:53:03","date_gmt":"2020-10-31T07:53:03","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=335"},"modified":"2020-12-10T14:23:59","modified_gmt":"2020-12-10T06:23:59","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e5%85%a5%e9%97%a8%e5%ad%a6%e4%b9%a0%ef%bc%88%e4%ba%8c%ef%bc%89-%e4%bd%bf%e7%94%a8jdbc%e5%ae%9e%e7%8e%b0%e5%af%b9%e6%95%b0%e6%8d%ae%e5%ba%93%e7%9a%84","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/javastudy\/mysql\/335.html","title":{"rendered":"MySQL\u6570\u636e\u5e93\u5165\u95e8\u5b66\u4e60\uff08\u4e8c\uff09\u2014\u2014\u4f7f\u7528JDBC\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u5220\u67e5\u6539\u529f\u80fd"},"content":{"rendered":"\n

MySQL\u6570\u636e\u5e93\u5165\u95e8\u5b66\u4e60\uff08\u4e8c\uff09\u2014\u2014\u4f7f\u7528JDBC\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u5220\u67e5\u6539\u529f\u80fd<\/h1>\n\n\n\n

1.\u524d\u8a00<\/h2>\n\n\n\n

\u5728\u4e0a\u7bc7\u6587\u7ae0\u4e2d\u5df2\u7ecf\u5efa\u7acb\u4e86\u6570\u636e\u5e93\u548c\u8868\uff0c\u5e76\u4e14\u4f7f\u7528JDBC\u8fde\u63a5\u4e86\u6570\u636e\u5e93\u5b9e\u73b0\u4e86\u5411\u6570\u636e\u5e93\u4e2d\u63d2\u5165\u6570\u636e\u7684\u529f\u80fd\uff1a\u8be6\u60c5\u8bf7\u770b\uff1aMySQL\u6570\u636e\u5e93\u5165\u95e8\u5b66\u4e60\uff08\u4e00\uff09\u2014\u2014\u521b\u5efa\u6570\u636e\u5e93\u5e76Java\u5b9e\u73b0JDBC\u8fde\u63a5\u6570\u636e\u5e93\u540e\u6dfb\u52a0\u6570\u636e<\/a><\/p>\n\n\n\n

2.MySQL\u7684\u589e\u5220\u9664\u8be5<\/h2>\n\n\n\n

\u5e38\u7528\u7684Statement\u65b9\u6cd5\uff1a<\/strong>
1\uff0cboolean execute \u5141\u8bb8\u6267\u884c\u67e5\u8be2\u8bed\u53e5\u3001\u66f4\u65b0\u8bed\u53e5\u3001DDL\u8bed\u53e5
\u8fd4\u56de\u503c\u4e3atrue\u65f6\uff0c\u8868\u793a\u6267\u884c\u7684\u662f\u67e5\u8be2\u8bed\u53e5\uff0c\u53ef\u4ee5\u901a\u8fc7getResultSet\u65b9\u6cd5\u83b7\u53d6\u7ed3\u679c\uff1b\u8fd4\u56de\u503c\u4e3afalse\u65f6\uff0c\u6267\u884c\u7684\u662f\u66f4\u65b0\u8bed\u53e5\u6216DDL\u8bed\u53e5\u3002
2\uff0cgetUpdateCount\u65b9\u6cd5 \u83b7\u53d6\u66f4\u65b0\u7684\u8bb0\u5f55\u6570\u91cf\u3002
3\uff0cint executeUpdate(String sql)\u6267\u884c\u7ed9\u5b9a SQL \u8bed\u53e5
\u8be5\u8bed\u53e5\u53ef\u80fd\u4e3a INSERT\u3001UPDATE \u6216 DELETE \u8bed\u53e5\uff0c\u6216\u8005\u4e0d\u8fd4\u56de\u4efb\u4f55\u5185\u5bb9\u7684 SQL \u8bed\u53e5\uff08\u5982 SQL DDL \u8bed\u53e5\uff09\u3002
4\uff0cResultSet executeQuery(String sql) \u6267\u884c\u7ed9\u5b9a\u7684 SQL \u8bed\u53e5
\u8be5\u8bed\u53e5\u8fd4\u56de\u5355\u4e2a ResultSet \u5bf9\u8c61\u3002\u8fd4\u56de\u503c\u662f\u66f4\u65b0\u7684\u8bb0\u5f55\u6570\u91cf\u3002
\u4e8b\u5b9e\u4e0a\uff0cMySQL\u7684 \u201c\u589e\u5220\u67e5\u6539\u201d\u5176\u5b9e\u5c31\u662f\u5206\u4e3a\u4e24\u7c7b\uff0c\u4e00\u7c7b\u662f\u66f4\u65b0\u64cd\u4f5c\uff1aint executeUpdate(String sql)\u5305\u62ec\u4e86\u63d2\u5165\uff08insert\uff09\uff0c\u66f4\u65b0\uff08update\uff09\uff0c\u5220\u9664\uff08delete\uff09\uff1b\u53e6\u5916\u4e00\u7c7b\u662f\u67e5\u8be2\u64cd\u4f5c\uff08select\uff09\uff0c\u7531ResultSet executeQuery(String sql) \u5b9e\u73b0\u3002<\/p>\n\n\n\n

3.\u4f7f\u7528jdbc\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u6570\u636e\u7684\u66f4\u65b0\uff0c\u5220\u9664\uff0c\u67e5\u627e\u529f\u80fd\u3002<\/h2>\n\n\n\n

\u6211\u4eec\u77e5\u9053\u4f7f\u7528Statement\u548cPreparedStatement\u90fd\u80fd\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u64cd\u4f5c\uff0c\u4f46\u662f\u5728\u6211\u4eec\u5728\u5177\u4f53\u7684\u751f\u4ea7\u73af\u5883\u4e2d\u603b\u662f\u666e\u904d\u4f7f\u7528PreparedStatement\u8fdb\u884c\u5bf9\u6570\u636e\u5e93\u64cd\u4f5c\uff0c\u9632\u6b62SQL\u6ce8\u5165\u7684\u98ce\u9669\u3002\u56e0\u6b64\u4ee5\u4e0b\u4ee3\u7801\u5747\u4f7f\u7528PreparedStatement\u8fdb\u884c\u64cd\u4f5c\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n

3.1\u66f4\u65b0\u64cd\u4f5c\uff0c\u5220\u9664\u64cd\u4f5c<\/h3>\n\n\n\n
 \/**\n     * \u66f4\u65b0book\n     * @param newBook\n     * @return \u8fd4\u56de\u53d7\u5f71\u54cd\u7684\u884c\u6570\n     *\/\n    public int updateBookByPreparedStatement(Book newBook) {\n    \t\n    \t\/\/\u62fc\u63a5\u9700\u8981\u6267\u884c\u7684\u66f4\u65b0sql\u8bed\u53e5\n    \tString sql = \"update  book  set name=?,price = ?,status = ?,discount = ?,isBorrowed = ?,createTime = ? where id = ?\";\n    \tint result = 0;\n    \ttry {\n    \t\t\/\/\u83b7\u53d6\u521b\u5efa\u8fde\u63a5\n\t\t\tConnection connection = JDBCUtil.getConnection();\n\t\t\t\/\/\u521b\u5efa\u9884\u5904\u7406\u5bf9\u8c61\n\t\t\tPreparedStatement preparedStatement = connection.prepareStatement(sql);\n\t\t\t\/\/\u8bbe\u7f6ename\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c\n\t\t\tpreparedStatement.setString(1, newBook.getName());\n\t\t\t\/\/\u8bbe\u7f6eprice\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c\n\t\t\tpreparedStatement.setDouble(2, newBook.getPrice());\n\t\t\t\/\/\u8bbe\u7f6estatus\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c\n\t\t\tpreparedStatement.setByte(3, newBook.getStatus());\n\t\t\t\/\/\u8bbe\u7f6ediscount\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c\n\t\t\tpreparedStatement.setFloat(4, newBook.getDiscount());\n\t\t\t\/\/\u8bbe\u7f6eisBorrowed\u5bf9\u5e94\u5360\u4f4d\u7b26\u7684\u503c\n\t\t\tpreparedStatement.setBoolean(5, newBook.isBorrowed());\n\t\t\t\/\/\u8bbe\u7f6ecreateTime\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c,\u9700\u8981\u5c06 java.Util.Date \u8f6c\u5316\u4e3a java.sql.Date\u624d\u53ef\u4ee5\n\t\t\tpreparedStatement.setDate(6,new Date(newBook.getCreateTime().getTime()));\n\t\t\t\/\/\u8bbe\u7f6eid\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c\n\t\t\tpreparedStatement.setInt(7, newBook.getId());\n\t\t\t\/\/\u5f00\u59cb\u6267\u884c\u66f4\u65b0,\u5e76\u8fd4\u56de\u5f71\u54cd\u7684\u884c\u6570\n\t\t\tresult = preparedStatement.executeUpdate();\n\t\t\t\/\/\u91ca\u653e\u8d44\u6e90,\u5148\u5f00\u542f\u7684\u540e\u91ca\u653e\n\t\t\tpreparedStatement.close();\n\t\t\tconnection.close();\n\t\t} catch (SQLException e) {\n\t\t\t\/\/ TODO Auto-generated catch block\n\t\t\te.printStackTrace();\n\t\t}\n    \t\n    \t\n\t\treturn result;\n    \t\n    }\n    \/**\n     * \u5220\u9664book\n     * @param id \u9700\u8981\u5220\u9664\u4e66\u7c4d\u7684ID\n     * @return \u8fd4\u56de\u53d7\u5f71\u54cd\u7684\u884c\u6570\n     *\/\n    public int deleteBookById(int id) {\n    \t\n    \t\/\/\u62fc\u63a5\u9700\u8981\u6267\u884c\u7684\u5220\u9664\u7684sql\u8bed\u53e5\n    \tString sql = \"delete from book  where id = ?\";\n    \tint result = 0;\n    \t\n    \ttry {\n    \t\t\/\/\u83b7\u53d6\u521b\u5efa\u8fde\u63a5\n\t\t\tConnection connection = JDBCUtil.getConnection();\n\t\t\t\/\/\u521b\u5efa\u9884\u5904\u7406\u5bf9\u8c61\n\t\t\tPreparedStatement preparedStatement = connection.prepareStatement(sql);\n\t\t\t\/\/\u8bbe\u7f6eid\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c\n\t\t\tpreparedStatement.setInt(1, id);\n\t\t\t\/\/\u5f00\u59cb\u6267\u884c\u66f4\u65b0,\u5e76\u8fd4\u56de\u5f71\u54cd\u7684\u884c\u6570\n\t\t\tresult = preparedStatement.executeUpdate();\n\t\t\t\/\/\u91ca\u653e\u8d44\u6e90,\u5148\u5f00\u542f\u7684\u540e\u91ca\u653e\n\t\t\tpreparedStatement.close();\n\t\t\tconnection.close();\n\t\t} catch (SQLException e) {\n\t\t\te.printStackTrace();\n\t\t}\n\t\treturn result;\n    \t\n    }\n    <\/code><\/pre>\n\n\n\n
3.2\u67e5\u8be2\u64cd\u4f5c\uff1a\u67e5\u8be2\u5355\u4e2a\uff0c\u67e5\u8be2\u6240\u6709<\/h3>\n\n\n\n
3.2.1ResultSet\u7b80\u4ecb<\/h4>\n\n\n\n
\u7ed3\u679c\u96c6(ResultSet)\u662f\u6570\u636e\u4e2d\u67e5\u8be2\u7ed3\u679c\u8fd4\u56de\u7684\u4e00\u79cd\u5bf9\u8c61\uff0c\u53ef\u4ee5\u8bf4\u7ed3\u679c\u96c6\u662f\u4e00\u4e2a\u5b58\u50a8\u67e5\u8be2\u7ed3\u679c\u7684\u5bf9\u8c61\uff0c\u4f46\u662f\u7ed3\u679c\u96c6\u5e76\u4e0d\u4ec5\u4ec5\u5177\u6709\u5b58\u50a8\u7684\u529f\u80fd\uff0c\u5b83\u540c\u65f6\u8fd8\u5177\u6709\u64cd\u7eb5\u6570\u636e\u7684\u529f\u80fd\uff0c\u53ef\u80fd\u5b8c\u6210\u5bf9\u6570\u636e\u7684\u66f4\u65b0\u7b49.\u3002
\u7ed3\u679c\u96c6\u8bfb\u53d6\u6570\u636e\u7684\u65b9\u6cd5\u4e3b\u8981\u662fgetXXX()\uff0c\u5b83\u7684\u53c2\u6570\u53ef\u4ee5\u662f\u6574\u578b\u8868\u793a\u7b2c\u51e0\u5217\uff08\u662f\u4ece1\u5f00\u59cb\u7684\uff09\uff0c\u8fd8\u53ef\u4ee5\u662f\u5217\u540d\u3002\u8fd4\u56de\u7684\u662f\u5bf9\u5e94\u7684XXX\u7c7b\u578b\u7684\u503c\u3002\u5982\u679c\u5bf9\u5e94\u90a3\u5217 \u662f\u7a7a\u503c\uff0cXXX\u662f\u5bf9\u8c61\u7684\u8bdd\u8fd4\u56deXXX\u578b\u7684\u7a7a\u503c\uff0c\u5982\u679cXXX\u662f\u6570\u5b57\u7c7b\u578b\uff0c\u5982Float\u7b49\u5219\u8fd4\u56de0,boolean\u8fd4\u56defalse.\u4f7f\u7528getString()\u53ef\u4ee5\u8fd4\u56de\u6240\u6709\u7684\u5217\u7684\u503c\uff0c\u4e0d\u8fc7\u8fd4\u56de\u7684\u90fd\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u3002XXX\u53ef\u4ee5\u4ee3\u8868\u7684\u7c7b\u578b\u6709: \u57fa\u672c\u7684\u6570\u636e\u7c7b\u578b\u5982\u6574\u578b(int)\uff0c\u5e03\u5c14\u578b(Boolean)\uff0c\u6d6e\u70b9\u578b(Float,Double)\u7b49\uff0c\u6bd4\u7279\u578b(byte)\uff0c\u8fd8\u5305\u62ec\u4e00\u4e9b\u7279\u6b8a\u7684\u7c7b\u578b\uff0c\u5982\uff1a\u65e5 \u671f\u7c7b\u578b\uff08java.sql.Date\uff09\uff0c\u65f6\u95f4\u7c7b\u578b(java.sql.Time)\uff0c\u65f6\u95f4\u6233\u7c7b\u578b(java.sql.Timestamp)\uff0c\u5927\u6570\u578b (BigDecimal\u548cBigInteger\u7b49)\u7b49\u3002\u8fd8\u53ef\u4ee5\u4f7f\u7528getArray(intcolindex\/String columnname)\uff0c\u901a\u8fc7\u8fd9\u4e2a\u65b9\u6cd5\u83b7\u5f97\u5f53\u524d\u884c\u4e2d\uff0ccolindex\u6240\u5728\u5217\u7684\u5143\u7d20\u7ec4\u6210\u7684\u5bf9\u8c61\u7684\u6570\u7ec4\u3002\u4f7f\u7528 getAsciiStream(intcolindex\/String colname)\u53ef\u4ee5\u83b7\u5f97\u8be5\u5217\u5bf9\u5e94\u7684\u5f53\u524d\u884c\u7684ascii\u6d41\u3002\u4e5f\u5c31\u662f\u8bf4\u6240\u6709\u7684getXXX\u65b9\u6cd5\u90fd\u662f\u5bf9\u5f53\u524d\u884c\u8fdb\u884c\u64cd\u4f5c\u3002
\u7ed3\u679c\u96c6\u4ece\u5176\u4f7f\u7528\u7684\u7279\u70b9\u4e0a \u53ef\u4ee5\u5206\u4e3a\u56db\u7c7b\uff0c\u8fd9\u56db\u7c7b\u7684\u7ed3\u679c\u96c6\u7684\u6240\u5177\u5907\u7684\u7279\u70b9\u90fd\u662f\u548cStatement\uff08\u6216\u8005Statement\u7684\u5b50\u7c7b\uff09\u8bed\u53e5\u7684\u521b\u5efa\u6709\u5173\uff0c\u56e0\u4e3a\u7ed3\u679c\u96c6\u662f\u901a\u8fc7Statement\u8bed\u53e5\u6267\u884c\u540e\u4ea7\u751f\u7684\uff0c\u6240\u4ee5\u53ef\u4ee5 \u8bf4\uff0c\u7ed3\u679c\u96c6\u5177\u5907\u4f55\u79cd\u7279\u70b9\uff0c\u5b8c\u5168\u51b3\u5b9a\u4e8eStatement\u3002
\u672c\u6587\u53ea\u7b80\u5355\u4ecb\u7ecd\u5176\u4e2d\u6700\u57fa\u672c\u7684\u4e00\u79cd\u7528\u6cd5\uff1a
\u4e4b\u6240\u4ee5\u8bf4\u662f\u6700\u57fa\u672c\u7684ResultSet\u662f\u56e0\u4e3a\u8fd9\u4e2aResultSet\u5b83\u8d77\u5230\u7684\u4f5c\u7528\u5c31\u662f\u5b8c\u6210\u4e86\u67e5\u8be2\u7ed3\u679c\u7684\u5b58\u50a8\u529f\u80fd\uff0c\u800c\u4e14\u53ea\u80fd\u8bfb\u53d6\u4e00\u6b21\uff0c\u4e0d\u80fd\u591f\u6765\u56de\u7684\u6eda\u52a8\u8bfb\u53d6\u3002\u8fd9\u79cd\u7ed3\u679c\u96c6\u7684\u521b\u5efa\u65b9\u5f0f\u5982\u4e0b:<\/p>\n\n\n\n
Statement st = conn.CreateStatement()\nResultSet rs = Statement.excuteQuery(sqlStr);<\/code><\/pre>\n\n\n\n
\u7531\u4e8e\u8fd9\u79cd\u7ed3\u679c\u96c6\u4e0d\u652f\u6301\u6eda\u52a8\u7684\u8bfb\u53d6\u529f\u80fd,\u6240\u4ee5\u5982\u679c\u83b7\u5f97\u8fd9\u6837\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u53ea\u80fd\u4f7f\u7528\u5b83\u91cc\u9762\u7684next()\u65b9\u6cd5\uff0c\u9010\u4e2a\u7684\u8bfb\u53bb\u6570\u636e.\u3002\u6ce8\u610f\uff0c\u5728\u8bfb\u53d6ResultSet \u7684\u6570\u636e\u524d\uff0c\u4e00\u5b9a\u8981\u5148\u4f7f\u7528resultSet.next()\u9996\u5148\u5224\u5b9a\u6709\u6ca1\u6709\u6570\u636e\u5e76\u4e14\u79fb\u52a8\u6e38\u6807\u5230\u7b2c\u4e00\u4e2a\u8bb0\u5f55\u7684\u4f4d\u7f6e\u3002\u8fd9\u662f\u56e0\u4e3a\uff1a
\u5f00\u59cb\u6307\u9488\u4f4d\u7f6e\u4f4d\u4e8e\u7b2c\u4e00\u884c\u4e4b\u524d\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u7b2c\u4e00\u6b21\u8c03\u7528next()\u65b9\u6cd5\u540e\u624d\u80fd\u5f00\u59cb\u83b7\u53d6\u6570\u636e\u3002\u8fd9\u79cd\u505a\u6cd5\u7684\u597d\u5904\u5728\u4e8e\u53ef\u4ee5\u65b9\u4fbf\u5730\u914d\u5408while\u8fdb\u884c\u904d\u5386\uff0c\u800c\u4e0d\u7528\u62c5\u5fc3\u53d6\u4e0d\u5230\u7b2c\u4e00\u884c\u3002<\/p>\n\n\n\n
while(resultSet.next()){\n    \/\/resultSet.getXXX()\n}<\/code><\/pre>\n\n\n\n
  1. \u6307\u9488\u79fb\u52a8\u5230\u6700\u540e\u4e00\u884c\u4e4b\u540e\u8fd4\u56defalse\uff0c\u53ef\u4ee5\u7528\u4f5c\u5faa\u73af\u7ed3\u675f\u7684\u6761\u4ef6\u3002\u5728\u4e24\u79cd\u60c5\u51b5\u4e0b\uff1a\u904d\u5386\u5230\u6700\u540e\u4e00\u884c\u4e4b\u540e\uff1b\u6216\u8005\u5f53 ResultSet \u4e2d\u6ca1\u6709\u5143\u7d20\u3001\u884c\u6570\u4e3a0\u65f6\uff0c\u8fd4\u56defalse\u9000\u51fa\u5faa\u73af<\/li><\/ol>\n\n\n\n
    3.2.2 \u5982\u60f3\u66f4\u52a0\u6df1\u5165\u4e86\u89e3ResultSet \u7684\u5176\u5b83\u7528\u6cd5\uff0c\u8bf7\u81ea\u884c\u767e\u5ea6\u3002<\/h4>\n\n\n\n
    3.2.3\u5177\u4f53\u4ee3\u7801\u5b9e\u73b0<\/h4>\n\n\n\n
     \/**\n     * \u901a\u8fc7ID\u67e5\u8be2book\n     * @param id \u8981\u67e5\u8be2\u7684book\u7684ID\n     * @return \u8fd4\u56deID\u5bf9\u5e94\u7684book\n     *\/\n    public Book findBookById(int id) {\n    \t\/\/\u62fc\u63a5\u9700\u8981\u6267\u884c\u7684\u67e5\u627e\u7684sql\u8bed\u53e5\n    \tString sql = \"select * from book  where id = ?\";\n    \t\/\/\u7ed3\u679c\u96c6\n    \tResultSet resultSet = null;\n    \tBook book = null;\n    \ttry {\n    \t\t\/\/\u83b7\u53d6\u521b\u5efa\u8fde\u63a5\n\t\t\tConnection connection = JDBCUtil.getConnection();\n\t\t\t\/\/\u521b\u5efa\u9884\u5904\u7406\u5bf9\u8c61\n\t\t\tPreparedStatement preparedStatement = connection.prepareStatement(sql);\n\t\t\t\/\/\u8bbe\u7f6eid\u5360\u4f4d\u7b26\u5bf9\u5e94\u7684\u503c\n\t\t\tpreparedStatement.setInt(1, id);\n\t\t\t\/\/\u5f00\u59cb\u6267\u884c\u67e5\u8be2\u8bed\u53e5,\u5e76\u8fd4\u56de\u67e5\u8be2\u7684\u7ed3\u679c\u96c6\n\t\t\tresultSet = preparedStatement.executeQuery();\n\t\t\t\/\/\u5982\u679c\u67e5\u8be2\u5230\u7ed3\u679c\u4e0d\u4e3a\u7a7a\u800c\u662f\u6709\u8bb0\u5f55\n\t\t\tif(resultSet.next()) {\n\t\t\t\/\/\u83b7\u53d6book\u7684name\n\t\t\tString name = resultSet.getString(\"name\");\n\t\t\t\/\/\u83b7\u53d6book\u7684status\n\t\t\tbyte status = resultSet.getByte(\"status\");\n\t\t\t\/\/\u83b7\u53d6book\u7684price\n\t\t\tdouble price = resultSet.getDouble(\"price\");\n\t\t\t\/\/\u83b7\u53d6book\u7684discount\n\t\t\tfloat discount = resultSet.getFloat(\"discount\");\n\t\t\t\/\/\u83b7\u53d6book\u7684isBorrowed\n\t\t\tboolean isBorrowed = resultSet.getBoolean(\"isBorrowed\");\n\t\t\t\/\/\u83b7\u53d6book\u7684createTime\n\t\t\tDate date = resultSet.getDate(\"createTime\");\n\t\t\tbook = new Book();\n\t\t\tbook.setBorrowed(isBorrowed);\n\t\t\tbook.setDiscount(discount);\n\t\t\tbook.setId(id);\n\t\t\tbook.setPrice(price);\n\t\t\tbook.setName(name);\n\t\t\tbook.setStatus(status);\n\t\t\tbook.setCreateTime(date);\n\t\t\t}\n\t\t\t\/\/\u91ca\u653e\u8d44\u6e90,\u5148\u5f00\u542f\u7684\u540e\u91ca\u653e\n\t\t\tresultSet.close();\n\t\t\tpreparedStatement.close();\n\t\t\tconnection.close();\n\t\t} catch (SQLException e) {\n\t\t\te.printStackTrace();\n\t\t\tbook = null;\n\t\t}\n    \t\n    \t\n\t\treturn book;\n    \t\n    }\n    \/**\n     * \u67e5\u8be2\u6240\u6709\u56fe\u4e66\n     * @return \u8fd4\u56deList<book>\n     *\/\n    public List<Book> findAllBook() {\n    \t\/\/\u62fc\u63a5\u9700\u8981\u6267\u884c\u7684\u67e5\u627e\u7684sql\u8bed\u53e5\n    \tString sql = \"select * from book \";\n    \t\/\/\u7ed3\u679c\u96c6\n    \tResultSet resultSet = null;\n    \tList<Book> bookList = null;\n    \ttry {\n    \t\t\/\/\u83b7\u53d6\u521b\u5efa\u8fde\u63a5\n\t\t\tConnection connection = JDBCUtil.getConnection();\n\t\t\t\/\/\u521b\u5efa\u9884\u5904\u7406\u5bf9\u8c61\n\t\t\tPreparedStatement preparedStatement = connection.prepareStatement(sql);\n\t\t\t\/\/\u5f00\u59cb\u6267\u884c\u67e5\u8be2\u8bed\u53e5,\u5e76\u8fd4\u56de\u67e5\u8be2\u7684\u7ed3\u679c\u96c6\n\t\t\tresultSet = preparedStatement.executeQuery();\n\t\t\tbookList = new ArrayList<>();\n\t\t\t\/\/\u5982\u679c\u67e5\u8be2\u5230\u7ed3\u679c\u4e0d\u4e3a\u7a7a\u800c\u662f\u6709\u8bb0\u5f55\n\t\t\twhile(resultSet.next()) {\n\t\t\t\/\/\u83b7\u53d6book\u7684ID\n\t\t\tint id = resultSet.getInt(\"id\");\n\t\t\t\/\/\u83b7\u53d6book\u7684name\n\t\t\tString name = resultSet.getString(\"name\");\n\t\t\t\/\/\u83b7\u53d6book\u7684status\n\t\t\tbyte status = resultSet.getByte(\"status\");\n\t\t\t\/\/\u83b7\u53d6book\u7684price\n\t\t\tdouble price = resultSet.getDouble(\"price\");\n\t\t\t\/\/\u83b7\u53d6book\u7684discount\n\t\t\tfloat discount = resultSet.getFloat(\"discount\");\n\t\t\t\/\/\u83b7\u53d6book\u7684isBorrowed\n\t\t\tboolean isBorrowed = resultSet.getBoolean(\"isBorrowed\");\n\t\t\t\/\/\u83b7\u53d6book\u7684createTime\n\t\t\tDate date = resultSet.getDate(\"createTime\");\n\t\t\tBook book = new Book();\n\t\t\tbook.setBorrowed(isBorrowed);\n\t\t\tbook.setDiscount(discount);\n\t\t\tbook.setId(id);\n\t\t\tbook.setPrice(price);\n\t\t\tbook.setName(name);\n\t\t\tbook.setStatus(status);\n\t\t\tbook.setCreateTime(date);\n\t\t\tbookList.add(book);\n\t\t\t}\n\t\t\t\n\t\t\t\/\/\u91ca\u653e\u8d44\u6e90,\u5148\u5f00\u542f\u7684\u540e\u91ca\u653e\n\t\t\tresultSet.close();\n\t\t\tpreparedStatement.close();\n\t\t\tconnection.close();\n\t\t} catch (SQLException e) {\n\t\t\te.printStackTrace();\n\t\t\tbookList = null;\n\t\t}\n    \t\n    \t\n\t\treturn bookList;\n    \t\n    }<\/code><\/pre>\n\n\n\n
    4.\u6d4b\u8bd5\u4ee3\u7801<\/h2>\n\n\n\n
    @Test\n    void testUpdateBook() {\n        Book newBook = new Book();\n        newBook.setId(1);\n        newBook.setName(\"\u7ea2\u697c\u68a6\");\n        newBook.setCreateTime(new Date());\n        newBook.setBorrowed(Book.isBorrowed_FALSE);\n        newBook.setPrice(60.5);\n        newBook.setStatus(Book.STATUS_NORMAL);\n        BookDao bookDao = new BookDao();\n        int result = bookDao.updateBookByPreparedStatement(newBook);\n        if(result == 1) {\n            System.out.println(\"\u66f4\u65b0\u4e66\u7c4d\u6210\u529f\uff01\");\n        }else {\n            System.out.println(\"\u66f4\u65b0\u4e66\u7c4d\u5931\u8d25\uff01\");\n        }\n\n    }\n    @Test\n    void testdeleteBookById() {\n        BookDao bookDao = new BookDao();\n        int result = bookDao.deleteBookById(2);\n        if(result == 1) {\n            System.out.println(\"\u5220\u9664\u4e66\u6210\u529f\uff01\");\n        }else {\n            System.out.println(\"\u5220\u9664\u4e66\u5931\u8d25\uff01\");\n        }\n\n    }\n    @Test\n    void testFindBookById() {\n        BookDao bookDao = new BookDao();\n        Book book = bookDao.findBookById(3);\n        if(book != null) {\n          System.out.println(\"\u67e5\u627e\u4e66\u7c4d\u6210\u529f:\"+ book);\n        }else {\n            System.out.println(\"\u6570\u636e\u5e93\u4e2d\u4e0d\u5b58\u5728\u8be5\u4e66\u7c4d\uff01\");\n        }\n\n    }\n    @Test\n    void testFindAllBook() {\n        BookDao bookDao = new BookDao();\n        List<Book> bookList = bookDao.findAllBook();\n        if(bookList == null || bookList.size() == 0) {\n            System.out.println(\"\u4e66\u7c4d\u4e3a\u7a7a\uff01\");\n        }else {\n            for(Book book : bookList) {\n                System.out.println(book);\n            }\n        }\n\n\n    }<\/code><\/pre>\n\n\n\n
    \u4e4b\u540e\u4f7f\u7528JUnit\u5355\u5143\u6d4b\u8bd5\u7684\u65b9\u6cd5\u8fdb\u884c\u6d4b\u8bd5\u5373\u53ef\u3002<\/p>\n\n\n\n
    5.\u672c\u9879\u76ee\u6e90\u4ee3\u7801\u4e0b\u8f7d\uff08eclipse2019\uff0cJDK1.8\uff0cMySQL8.0\uff09\uff1a<\/h2>\n\n\n\n
    mysqlProject2<\/a>\u4e0b\u8f7d<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
    MySQL\u6570\u636e\u5e93\u5165\u95e8\u5b66\u4e60\uff08\u4e8c\uff09\u2014\u2014\u4f7f\u7528JDBC\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u5220\u67e5\u6539\u529f\u80fd 1.\u524d\u8a00 \u5728\u4e0a\u7bc7\u6587\u7ae0\u4e2d\u5df2\u7ecf\u5efa\u7acb\u4e86\u6570\u636e\u5e93\u548c\u8868\uff0c\u5e76\u4e14\u4f7f\u7528JDB …<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[94],"tags":[95,100,24,101],"_links":{"self":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/335"}],"collection":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/comments?post=335"}],"version-history":[{"count":2,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/335\/revisions"}],"predecessor-version":[{"id":341,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/335\/revisions\/341"}],"wp:attachment":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/media?parent=335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/categories?post=335"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/tags?post=335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}