{"id":32,"date":"2021-01-05T23:55:19","date_gmt":"2021-01-05T15:55:19","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=32"},"modified":"2021-01-08T01:27:40","modified_gmt":"2021-01-07T17:27:40","slug":"jdbc-%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-32.html","title":{"rendered":"JDBC \u6280\u672f"},"content":{"rendered":"\n<p>jdbc \u5168\u79f0\u4e3a java database connectivity\uff0c\u662f java \u64cd\u4f5c\u6570\u636e\u5e93\u7684\u6280\u672f\u3002<\/p>\n\n\n\n<p>jdbc \u7684\u672c\u8d28\u662f\u4e00\u5957\u64cd\u4f5c\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u63a5\u53e3\u3002\u5404\u4e2a\u6570\u636e\u5e93\u5382\u5546\u63d0\u4f9b\u5b9e\u73b0\u7684\u9a71\u52a8 jar \u5305\uff0c\u7531\u7a0b\u5e8f\u5458\u7f16\u5199\u64cd\u4f5c\u6570\u636e\u5e93\u4ee3\u7801\u3002<\/p>\n\n\n\n<h4>\u4e00. jdbc \u5b9e\u73b0\u589e\u5220\u6539\u67e5<\/h4>\n\n\n\n<p>1.\u5bfc\u5165\u9a71\u52a8jar \uff08 jar \u5305\u4e0b\u8f7d\uff0c\u70b9\u51fb<a href=\"https:\/\/pan.5252.online\/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7\/JavaJar\/jdbc\/\" data-type=\"URL\" data-id=\"https:\/\/pan.5252.online\/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7\/JavaJar\/jdbc\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u8fd9\u91cc<\/a>\uff09<\/p>\n\n\n\n<p>2.\u6ce8\u518c\u9a71\u52a8<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class.forName(\"com.mysql.jdbc.Driver\");<\/code><\/pre>\n\n\n\n<p>( 8.0 \u4ee5\u4e0a\u7248\u672c\u4e3a com.mysql.cj.jdbc.Driver )<\/p>\n\n\n\n<p>(\u4e0a\u9762\u7684\u5199\u6cd5\uff0c\u5b9e\u9645\u5c31\u662f\u5b9e\u4f8b\u5316 class \u7684\u4f5c\u7528\uff09<\/p>\n\n\n\n<p>(\u4e5f\u53ef\u4ee5  DriverManager.registerDriver(new com.mysql.cj.jdbc.Driver());   \uff09<\/p>\n\n\n\n<p>3.\u83b7\u53d6\u6570\u636e\u5e93\u8fde\u63a5\u5bf9\u8c61<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>connection conn =DriverManager.getConnection(\"jdbc:mysql:\/\/host:port\/db\",\"user\",\"password\");<\/code><\/pre>\n\n\n\n<p>4.\u5b9a\u4e49sql<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String sql = \"select * from user\";<\/code><\/pre>\n\n\n\n<p>5.\u83b7\u53d6\u6267\u884csql\u8bed\u53e5\u7684\u5bf9\u8c61statement<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Statement stmt = conn.createStatement();<\/code><\/pre>\n\n\n\n<p>6.\u6267\u884csql\uff0c\u63a5\u6536\u8fd4\u56de\u7ed3\u679c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int count = stmt.executeUpdate(sql);<\/code><\/pre>\n\n\n\n<p>7.\u5904\u7406\u7ed3\u679c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(count);<\/code><\/pre>\n\n\n\n<p>8.\u91ca\u653e\u8fde\u63a5\u5bf9\u8c61<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>stmt.close(conn);\nstmt.close(stmt);<\/code><\/pre>\n\n\n\n<h4>\u4e8c \u5bf9\u8c61\u8be6\u89e3<\/h4>\n\n\n\n<h5>1.DriverManager\uff1a\u9a71\u52a8\u7ba1\u7406\u5668<\/h5>\n\n\n\n<p>\u7528\u4e8e\u6ce8\u518c\u9a71\u52a8\uff1aclass.forName(&#8220;com.mysql.jdbc.Driver&#8221;);<\/p>\n\n\n\n<p>\uff08mysql 5 \u4ee5\u540e\u7684\u7248\u672cjar\u5305\u4f1a\u81ea\u52a8\u6ce8\u518c\u9a71\u52a8\uff09<\/p>\n\n\n\n<p>\u8fde\u63a5\u6570\u636e\u5e93\uff1aDriverManager.getConnection(&#8220;url&#8221;,&#8221;user&#8221;,&#8221;password&#8221;);<\/p>\n\n\n\n<p>\uff08 url \u7684\u5199\u6cd5 \uff1ajdbc:sql:\/\/host:port\/db\uff09<\/p>\n\n\n\n<h5>2.Connection\uff1a\u6570\u636e\u5e93\u8fde\u63a5\u5bf9\u8c61<\/h5>\n\n\n\n<p>\u83b7\u53d6\u6267\u884c sql \u5bf9\u8c61\uff1a<\/p>\n\n\n\n<ul><li>createStatement()<\/li><li>prepareStatement(String sql)<\/li><\/ul>\n\n\n\n<p>\u7ba1\u7406\u4e8b\u52a1<\/p>\n\n\n\n<ul><li>\u5f00\u542f\u4e8b\u52a1\uff1avoid setAutoCommit(boolean autoCommit);<\/li><li>\u63d0\u4ea4\u4e8b\u52a1\uff1acommit();<\/li><li>\u56de\u6eda\u4e8b\u52a1\uff1arollback();<\/li><\/ul>\n\n\n\n<h5>3.Statement\uff1a\u6267\u884c sql \u7684\u5bf9\u8c61<\/h5>\n\n\n\n<p>\u6267\u884c sql <\/p>\n\n\n\n<ul><li>boolean execute(String sql); \u53ef\u6267\u884c\u4efb\u610fsql<\/li><li>int executeUpdate(String sql); \u6267\u884cDML\uff0cDDL<\/li><li>ResultSet executeQuery(String sql); \u6267\u884cDQL\u8bed\u53e5<\/li><\/ul>\n\n\n\n<h5>4.ResultSet\uff1a\u7ed3\u679c\u96c6\u5bf9\u8c61<\/h5>\n\n\n\n<p>\u662f\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5305\u542b\u4e86\u591a\u6761\u6570\u636e\uff0c\u662f sql \u67e5\u8be2\u5230\u7684\u6240\u6709\u6570\u636e<\/p>\n\n\n\n<p>\u6bcf\u6b21\u64cd\u4f5c\u4e00\u6761\u6570\u636e\uff0c\u901a\u8fc7\u79fb\u52a8\u6e38\u6807\u4e0d\u65ad\u83b7\u53d6\u6570\u636e<\/p>\n\n\n\n<ul><li>boolean rs.next(); \u5411\u540e\u79fb\u52a8\u4e00\u6761\u6570\u636e\uff0c\uff08\u5b83\u540c\u65f6\u8fd4\u56de\u4e00\u4e2a boolean\uff09<\/li><li>XXX getXXX(&#8220;name&#8221;); \u83b7\u53d6 XXX \u7c7b\u578b\u7684\u6570\u636e\uff0c\u540d\u79f0\u4e3a name<\/li><\/ul>\n\n\n\n<h5>5.Preparestatement\u5bf9\u8c61\uff0c\u9884\u7f16\u8bd1sql\u5bf9\u8c61<\/h5>\n\n\n\n<p>sql \u7684\u7f16\u5199\u5982\u679c\u662f\u9759\u6001\u7684\uff0c\u9700\u8981\u8fde\u63a5\u5b57\u7b26\u4e32\uff0c\u5bb9\u6613\u88ab\u6ce8\u5165sql<\/p>\n\n\n\n<p>\u7528 ? \u4f5c\u4e3a\u5360\u4f4d\u7b26\uff0c\u7f16\u8bd1\u65f6\uff0c\u518d\u6362\u6210\u771f\u6b63\u7684\u5b57\u7b26\uff0c\u8fd9\u6837\u66f4\u5b89\u5168<\/p>\n\n\n\n<p>\u5728\u6267\u884c\u524d\uff0c\u5bf9 \uff1f \u901a\u8fc7 pstmt.setXXX( index, value);\u8d4b\u503c<\/p>\n\n\n\n<h4>\u4e09 \u4e8b\u52a1\u7ba1\u7406<\/h4>\n\n\n\n<p>\u8fd9\u91cc\u7684\u4e8b\u52a1\uff0c\u5305\u542b\u591a\u4e2a\u8bed\u53e5\uff0c\u5982\u4f55\u4fdd\u8bc1\u4e2d\u9014\u9519\u8bef\u65f6\uff0c\u56de\u6eda\uff1f<\/p>\n\n\n\n<p>\u5728\u83b7\u53d6\u8fde\u63a5\u4e4b\u540e\uff08getConnection)\uff0c\u9996\u5148\u5c31\u8981\u5f00\u542f\u4e8b\u52a1<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>            \/\/\u5f00\u542f\u4e8b\u52a1\n            conn.setAutoCommit(false);<\/code><\/pre>\n\n\n\n<p>\u5728\u6267\u884c\u5b8c sql \u8bed\u53e5\uff0c\u8fdb\u884c\u63d0\u4ea4\u4e8b\u52a1<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>            \/\/\u63d0\u4ea4\u4e8b\u52a1\n            conn.commit();<\/code><\/pre>\n\n\n\n<p>\u63a5\u7740\uff0c\u6355\u83b7 exception \uff0c\u7136\u540e\u5728 exception \u4e2d\u518d\u6355\u83b7\uff0c\u770b\u662f\u5426\u5b58\u5728\u4e8b\u52a1\u5f02\u5e38\uff0c\u5982\u679c\u5b58\u5728\u4e8b\u52a1\u5f02\u5e38\uff0c\u90a3\u4e48\u4e8b\u52a1\u56de\u6eda<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>catch (Exception e) {\n            \/\/\u4e8b\u52a1\u56de\u6eda\n            try {\n                if(conn != null) {\n                    conn.rollback();\n                }\n            } catch (SQLException e1) {\n                e1.printStackTrace();\n            }\n            e.printStackTrace();\n        }<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>jdbc \u5168\u79f0\u4e3a java database connectivity\uff0c\u662f java \u64cd\u4f5c\u6570\u636e\u5e93\u7684\u6280\u672f\u3002 jd&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/java\/post-32.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">JDBC \u6280\u672f<\/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\/32"}],"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=32"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/32\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=32"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=32"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=32"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}