{"id":38,"date":"2021-01-05T23:57:51","date_gmt":"2021-01-05T15:57:51","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=38"},"modified":"2021-05-23T21:35:49","modified_gmt":"2021-05-23T13:35:49","slug":"jdbctemplate","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-38.html","title":{"rendered":"JDBCTemplate"},"content":{"rendered":"\n<p>JDBCTemplate \u662f Spring \u6846\u67b6\u64cd\u4f5c\u6570\u636e\u5e93\u7684\u7b80\u5355\u5c01\u88c5\uff0c\u53ef\u4ee5\u7b80\u5316\u5bf9 JDBC \u7684\u5f00\u53d1<\/p>\n\n\n\n<p>\uff08\u6bd4\u5982\u7b80\u5316 PrepareStatement \u53c2\u6570\uff0c\u4ee5\u53ca\u81ea\u52a8\u5f52\u8fd8\u8fde\u63a5\u5bf9\u8c61\u7b49\uff09<\/p>\n\n\n\n<h5>1.\u5bfc\u5165 jar \u5305<\/h5>\n\n\n\n<p>\u70b9\u51fb<a data-type=\"URL\" data-id=\"https:\/\/pan.5252.online\/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7\/JavaJar\/jdbc\/\" rel=\"noreferrer noopener\" href=\"https:\/\/pan.5252.online\/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7\/JavaJar\/jdbc\/\" target=\"_blank\">\u8fd9\u91cc<\/a>\u8fdb\u884c\u4e0b\u8f7d , \u9700\u8981\u5bfc\u5165 5 \u4e2a jar \u5305<\/p>\n\n\n\n<p>maven\u5f15\u5165\u5982\u4e0b\u5750\u6807<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    &lt;dependency>\n      &lt;groupId>org.springframework&lt;\/groupId>\n      &lt;artifactId>spring-jdbc&lt;\/artifactId>\n      &lt;version>5.0.8.RELEASE&lt;\/version>\n    &lt;\/dependency><\/code><\/pre>\n\n\n\n<h5>2.\u521b\u5efa JDBCTemplate \u5bf9\u8c61\uff0c\u5b83\u4f9d\u8d56\u4e8e\u6570\u636e\u6e90 DataSource<\/h5>\n\n\n\n<p>( \u8fd9\u4e2a\u6570\u636e\u6e90\u5c31\u662f \u201c\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u201d \u5bf9\u8c61\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>JdbcTemplate template = new JdbcTemplate(ds);<\/code><\/pre>\n\n\n\n<h5>3.\u8c03\u7528 JdbcTemplate \u65b9\u6cd5\u5b8c\u6210 CRUD \u64cd\u4f5c<\/h5>\n\n\n\n<ul><li>update();                      \u6267\u884c DML \u8bed\u53e5\uff0c\u589e\u5220\u6539<\/li><li>queryForMap();          \u5c06\u67e5\u8be2\u7ed3\u679c\u5c01\u88c5\u4e3a map \u96c6\u5408<\/li><li>queryForList();            \u5c06\u67e5\u8be2\u7ed3\u679c\u5c01\u88c5\u4e3a list \u96c6\u5408<\/li><li>query();                         \u5c06\u7ed3\u679c\u5c01\u88c5\u4e3a JavaBean \u5bf9\u8c61<\/li><li>queryForObject();       \u67e5\u8be2\u7ed3\u679c\uff0c\u5c01\u88c5\u4e3a\u5bf9\u8c61<\/li><\/ul>\n\n\n\n<h5>4.\u5bf9 Update \u7684\u8be6\u7ec6\u89e3\u91ca\uff1a<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>int count = template.update(sql,\"\u53c2\u65701\",\"\u53c2\u65702\"...);<\/code><\/pre>\n\n\n\n<p>\u8fd4\u56de\u503c\uff1a\u8fd9\u91cc\u8fd4\u56de\u5f71\u54cd\u7684\u6761\u6570<\/p>\n\n\n\n<p>\u53c2\u6570\u5217\u8868\uff1a\u7b2c\u4e00\u4e2a\u662f sql \u8bed\u53e5\uff0c\u540e\u9762\u7684\u662f ?  \u7684\u5185\u5bb9<\/p>\n\n\n\n<h5>5.\u5bf9 queryForMap \u7684\u8be6\u7ec6\u89e3\u91ca<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>Map&lt;String, Object> map = template.queryForMap(sql, \"args1\",\"args2\"...);<\/code><\/pre>\n\n\n\n<p>\u53ea\u80fd\u8fd4\u56de\u4e00\u6761\u7ed3\u679c\uff0c\u5426\u5219\u62a5\u9519<\/p>\n\n\n\n<p>\u53ef\u4ee5\u7528\u4e8e\u67e5\u8be2\u4e00\u6761\u6570\u636e, \u8fd4\u56de\u7684\u662f\u952e\u503c\u5bf9\u7684\u5f62\u5f0f<\/p>\n\n\n\n<h5>6. queryForList \u7684\u8be6\u7ec6\u89e3\u91ca<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Map&lt;String, Object>> list = template.queryForList(sql,\"args1\",\"args2\"..);<\/code><\/pre>\n\n\n\n<p>\u6bcf\u4e2alist \u90fd\u662f\u4e00\u4e2a map \uff0c\u5176\u4e2d\u7684\u6bcf\u4e00\u6761\u4fe1\u606f\uff0c\u5c31\u662f \u4e00\u4e2a map, \u53ef\u4ee5\u7528\u4e8e\u67e5\u8be2\u591a\u6761\u8bb0\u5f55, \u591a\u4e2a\u8bb0\u5f55\u5c31\u4f7f\u7528\u5b83<\/p>\n\n\n\n<h5>7. query \u65b9\u6cd5\u7684\u8be6\u7ec6\u89e3\u91ca<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>List&lt;Emp> list = template.query(sql, new BeanPropertyRowMapper&lt;Emp>(Emp.class));<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u9700\u8981\u4e00\u4e2a rowMapper \u7c7b\u578b\u7684\u6570\u636e\uff08\u5047\u8bbe\u5c01\u88c5\u7684\u7c7b\u4e3a Emp \uff09<\/p>\n\n\n\n<p>\uff08\u8fd9\u4e2a\u7c7b\uff0c\u9700\u8981\u628a\u666e\u901a\u7c7b\u578b\uff0c\u8f6c\u6362\u4e3a \u5f15\u7528\u7c7b\u578b\uff0c\u5982 int -&gt; Interger )<\/p>\n\n\n\n<h5>8. queryForObject \u7684\u8be6\u7ec6\u89e3\u91ca<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>Long total = template.queryForObject(sql, Long.class);<\/code><\/pre>\n\n\n\n<p>\u5c01\u88c5\u4e3a\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8fd9\u91cc\u5047\u8bbe\u662f Long \u7c7b\u578b<\/p>\n\n\n\n<p>\u5c01\u88c5\u4e3a\u6307\u5b9a\u7684\u5bf9\u8c61\u65f6, \u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u8868\u5c5e\u6027\u5fc5\u987b\u5bf9\u5e94, \u5426\u5219\u4e0d\u5bf9\u5e94\u7684\u5b57\u6bb5\u4e3anull, \u82e5\u8bbe\u8ba1\u65f6\u65e0\u6cd5\u5bf9\u5e94, \u90a3\u4e48\u4f60\u8981\u4f7f\u7528forMap, \u5b83\u80fd\u624b\u52a8\u5c01\u88c5<\/p>\n\n\n\n<p><strong>9.\u7b80\u5355\u7528\u6cd5, \u8fd9\u91cc\u4ec5\u5c55\u793a\u4e00\u4e0b\u5feb\u901f\u4f7f\u7528<\/strong><\/p>\n\n\n\n<p> \u4ec5\u9700 2 \u6b65\u5c31\u53ef\u4ee5\u5b8c\u6210jdbc\u64cd\u4f5c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package dao.impl;\n\nimport dao.UserDao;\nimport domain.User;\nimport util.JDBCUtils;\nimport org.springframework.jdbc.core.BeanPropertyRowMapper;\nimport org.springframework.jdbc.core.JdbcTemplate;\n\nimport java.util.List;\n\npublic class UserDaoImpl implements UserDao {\n\n    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());\n\n    @Override\n    public List&lt;User> findAll() {\n        \/\/\u4f7f\u7528JDBC\u64cd\u4f5c\u6570\u636e\u5e93\n        \/\/1.\u5b9a\u4e49sql\n        String sql =  \"select * from user\";\n        \/\/2.\u4f7f\u7528\n        List&lt;User> users =  template.query(sql,new BeanPropertyRowMapper&lt;User>(User.class));\n\n        return users;\n    }\n    @Override\n    public User findUserByUsernameAndPassword(String username, String password) {\n        try {\n            String sql = \"select * from user where username = ? and password = ?\";\n            User user = template.queryForObject(sql, new BeanPropertyRowMapper&lt;User>(User.class), username, password);\n            return user;\n        } catch (Exception e) {\n            e.printStackTrace();\n            return null;\n        }\n\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>JDBCTemplate \u662f Spring \u6846\u67b6\u64cd\u4f5c\u6570\u636e\u5e93\u7684\u7b80\u5355\u5c01\u88c5\uff0c\u53ef\u4ee5\u7b80\u5316\u5bf9 JDBC \u7684\u5f00\u53d1 \uff08\u6bd4\u5982\u7b80\u5316&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/java\/post-38.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">JDBCTemplate<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/38"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=38"}],"version-history":[{"count":2,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/38\/revisions"}],"predecessor-version":[{"id":1346,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/38\/revisions\/1346"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=38"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=38"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=38"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}