{"id":452,"date":"2017-10-27T14:19:44","date_gmt":"2017-10-27T06:19:44","guid":{"rendered":"https:\/\/blog.jsjs.org\/?p=452"},"modified":"2017-10-27T14:19:44","modified_gmt":"2017-10-27T06:19:44","slug":"mycat%e9%ab%98%e7%ba%a7%e8%bf%9b%e9%98%b6-mycat%e6%b3%a8%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/blog.jsjs.org\/?p=452","title":{"rendered":"Mycat\u9ad8\u7ea7\u8fdb\u9636&#8212;Mycat\u6ce8\u89e3"},"content":{"rendered":"<h2 id=\"\u6ce8\u89e3\u539f\u7406\">\u6ce8\u89e3\u539f\u7406<\/h2>\n<p><strong>\u6982\u5ff5\uff1a<\/strong><br \/>\nMyCat\u5bf9\u81ea\u8eab\u4e0d\u652f\u6301\u7684Sql\u8bed\u53e5\u63d0\u4f9b\u4e86\u4e00\u79cd\u89e3\u51b3\u65b9\u6848\u2014\u2014\u5728\u8981\u6267\u884c\u7684SQL\u8bed\u53e5\u524d\u6dfb\u52a0\u989d\u5916\u7684\u4e00\u6bb5\u7531\u6ce8\u89e3SQL\u7ec4\u7ec7\u7684\u4ee3\u7801\uff0c\u8fd9\u6837Sql\u5c31\u80fd\u6b63\u786e\u6267\u884c\uff0c\u8fd9\u6bb5\u4ee3\u7801\u79f0\u4e4b\u4e3a\u201c\u6ce8\u89e3\u201d\u3002\u6ce8\u89e3\u7684\u4f7f\u7528\u76f8\u5f53\u4e8e\u5bf9mycat\u4e0d\u652f\u6301\u7684sql\u8bed\u53e5\u505a\u4e86\u4e00\u5c42\u900f\u660e\u4ee3\u7406\u8f6c\u53d1\uff0c\u76f4\u63a5\u4ea4\u7ed9\u76ee\u6807\u7684\u6570\u636e\u8282\u70b9\u8fdb\u884csql\u8bed\u53e5\u6267\u884c\uff0c\u5176\u4e2d\u6ce8\u89e3SQL\u7528\u4e8e\u786e\u5b9a\u6700\u7ec8\u6267\u884cSQL\u7684\u6570\u636e\u8282\u70b9\u3002\u6ce8\u89e3\u7684\u5f62\u5f0f\u662f\uff1a<\/p>\n<pre class=\"prettyprint\"><code class=\"hljs fix has-numbering\"><span class=\"hljs-attribute\">\/*!mycat: sql<\/span>=<span class=\"hljs-string\">\u6ce8\u89e3Sql\u8bed\u53e5*\/<\/span><\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p>\u6ce8\u89e3\u7684\u4f7f\u7528\u65b9\u5f0f\u662f\uff1a<\/p>\n<pre class=\"prettyprint\"><code class=\"hljs fix has-numbering\"><span class=\"hljs-attribute\">\/*!mycat: sql<\/span>=<span class=\"hljs-string\">\u6ce8\u89e3Sql\u8bed\u53e5*\/\u771f\u6b63\u6267\u884cSql<\/span><\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u65f6\u5c06=\u53f7\u540e\u7684\u201c\u6ce8\u89e3Sql\u8bed\u53e5\u201d\u66ff\u6362\u4e3a\u9700\u8981\u7684Sql\u8bed\u53e5\u5373\u53ef\uff0c\u540e\u9762\u4f1a\u63d0\u5230\u5177\u4f53\u7684\u7528\u6cd5\u3002<br \/>\n<strong>\u539f\u7406\uff1a<\/strong><br \/>\nMyCat\u6267\u884cSQL\u8bed\u53e5\u7684\u6d41\u7a0b\u662f\u5148\u8fdb\u884cSQL\u89e3\u6790\u5904\u7406\uff0c\u89e3\u6790\u51fa\u5206\u7247\u4fe1\u606f(\u8def\u7531\u4fe1\u606f)\u540e\uff0c\u7136\u540e\u5230\u8be5\u5206\u7247\u5bf9\u5e94\u7684\u7269\u7406\u5e93\u4e0a\u53bb\u6267\u884c\uff1b\u82e5\u4f20\u5165\u7684SQL\u8bed\u53e5MyCat\u65e0\u6cd5\u89e3\u6790\uff0c\u5219MyCat\u4e0d\u4f1a\u53bb\u6267\u884c\uff1b\u800c\u6ce8\u89e3\u5219\u662f\u544a\u8bc9MyCat\u6309\u7167\u6ce8\u89e3\u5185\u7684SQL\uff08\u79f0\u4e4b\u4e3a\u6ce8\u89e3SQL\uff09\u53bb\u8fdb\u884c\u89e3\u6790\u5904\u7406\uff0c\u89e3\u6790\u51fa\u5206\u7247\u4fe1\u606f\u540e\uff0c\u5c06\u6ce8\u89e3\u540e\u771f\u6b63\u8981\u6267\u884c\u7684SQL\u8bed\u53e5\uff08\u79f0\u4e4b\u4e3a\u539f\u59cbSQL\uff09\u53d1\u9001\u5230\u8be5\u5206\u7247\u5bf9\u5e94\u7684\u7269\u7406\u5e93\u4e0a\u53bb\u6267\u884c\u3002<br \/>\n\u4ece\u4e0a\u9762\u7684\u539f\u7406\u53ef\u4ee5\u770b\u5230\uff0c\u6ce8\u89e3\u53ea\u662f\u544a\u8bc9MyCat\u5230\u4f55\u5904\u53bb\u6267\u884c\u539f\u59cbSQL\uff1b\u56e0\u800c\u4f7f\u7528\u6ce8\u89e3\u524d\uff0c\u8981\u6e05\u695a\u7684\u77e5\u9053\u8be5\u539f\u59cbSQL\u53bb\u54ea\u4e2a\u5206\u7247\u6267\u884c\uff0c\u7136\u540e\u5728\u6ce8\u89e3SQL\u4e2d\u4e5f\u6307\u5411\u8be5\u5206\u7247\uff0c\u8fd9\u6837\u624d\u80fd\u4f7f\u7528\uff01\u4f8b\u5b50\u4e2d\u7684sharding_id=10010 \u5373\u662f\u6307\u660e\u5206\u7247\u4fe1\u606f\u7684\u3002<br \/>\n\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u82e5\u6ce8\u89e3SQL\u6ca1\u6709\u80fd\u660e\u786e\u5230\u5177\u4f53\u67d0\u4e2a\u5206\u7247\uff0c\u8b6c\u5982\u4f8b\u5b50\u4e2d\u7684\u6ce8\u89e3SQL\u6ca1\u6709\u6dfb\u52a0sharding_id=10010\u8fd9\u4e2a\u6761\u4ef6\uff0c\u5219MyCat\u4f1a\u5c06\u539f\u59cbSQL\u53d1\u9001\u5230persons\u8868\u6240\u5728\u7684\u6240\u6709\u5206\u7247\u4e0a\u53bb\u6267\u884c\u53bb\uff0c\u8fd9\u6837\u9020\u6210\u7684\u540e\u679c\u82e5\u662f\u63d2\u5165\u8bed\u53e5\uff0c\u5219\u5728\u591a\u4e2a\u5206\u7247\u4e0a\u90fd\u5b58\u5728\u91cd\u590d\u8bb0\u5f55\uff0c\u540c\u6837\u67e5\u8be2\u3001\u66f4\u65b0\u3001\u5220\u9664\u64cd\u4f5c\u4e5f\u4f1a\u5f97\u5230\u9519\u8bef\u7684\u7ed3\u679c\uff01<br \/>\n<strong>\u89e3\u51b3\u95ee\u9898\uff1a<\/strong><\/p>\n<ul>\n<li>\n<ul>\n<li>MySql\u4e0d\u652f\u6301\u7684\u8bed\u6cd5\u7ed3\u6784\uff0c\u5982insert \u2026select\u2026<\/li>\n<\/ul>\n<\/li>\n<li>\u540c\u4e00\u4e2a\u5b9e\u4f8b\u5185\u7684\u8de8\u5e93\u5173\u8054\u67e5\u8be2\uff0c\u5982\u7528\u6237\u5e93\u548c\u5e73\u53f0\u5e93\u5185\u7684\u8868\u5173\u8054<\/li>\n<li>\u5b58\u50a8\u8fc7\u7a0b\u8c03\u7528\u3002<\/li>\n<li>\u8868\uff0c\u5b58\u50a8\u8fc7\u7a0b\u521b\u5efa\u3002<br \/>\n<strong>\u6ce8\u89e3\u89c4\u8303<\/strong><\/li>\n<li>\u6ce8\u89e3SQL\u4f7f\u7528select\u8bed\u53e5\uff0c\u4e0d\u5141\u8bb8\u4f7f\u7528delete\/update\/insert\u7b49\u8bed\u53e5\uff1b\u867d\u7136delete\/update\/insert \u7b49\u8bed\u53e5\u4e5f\u80fd\u7528\u5728\u6ce8\u89e3\u4e2d\uff0c\u4f46\u8fd9\u4e9b\u8bed\u53e5\u5728Sql\u5904\u7406\u4e2d\u6709\u989d\u5916\u7684\u903b\u8f91\u5224\u65ad\uff0c\u4ece\u6027\u80fd\u8003\u8651\uff0c\u8bf7\u4f7f\u7528select\u8bed\u53e5<\/li>\n<li>\u6ce8\u89e3SQL\u7981\u7528\u8868\u5173\u8054\u8bed\u53e5<\/li>\n<li>\u6ce8\u89e3SQL\u5c3d\u91cf\u7528\u6700\u7b80\u5355\u7684SQL\u8bed\u53e5\uff0c\u5982select id from tab_a where id=\u201910000\u2019<\/li>\n<li>\u65e0\u8bba\u662f\u539f\u59cbSQL\u8fd8\u662f\u6ce8\u89e3SQL\uff0c\u7981\u6b62DDL\u8bed\u53e5<\/li>\n<li>\u80fd\u4e0d\u7528\u6ce8\u89e3\u7684\u5c3d\u91cf\u4e0d\u7528<\/li>\n<li>\u8be6\u7ec6\u8981\u6c42\u89c1\u4e0b\u9762<br \/>\n<strong>Select<\/strong><br \/>\n-\u9009\u62e9\u80fd\u552f\u4e00\u786e\u5b9a\u5206\u7247\u7684\u4e3b\u8868\uff0c\u5982\u4e0e\u7528\u6237\u8868\u5173\u8054\u7684\u65f6\u5019\u53ef\u4ee5\u9009\u62e9\u7528\u6237\u8868<\/li>\n<li>\u82e5\u662f\u4e1a\u52a1\u9700\u8981\u5728\u4e3b\u8868\u6240\u5728\u7684\u5404\u4e2a\u5206\u7247\u4e0a\u90fd\u6267\u884c\u53ef\u4ee5\u4e0d\u52a0\u80fd\u786e\u5b9a\u5206\u7247\u7684\u6761\u4ef6<br \/>\n<strong>Insert<\/strong><br \/>\n<strong>\u5bf9\u4e8e\u5206\u7247\u8868<\/strong><\/li>\n<li>\u4f7f\u7528insert\u7684\u8868\u505a\u6ce8\u89e3SQL<\/li>\n<li>\u6ce8\u89e3SQL\u5fc5\u987b\u80fd\u786e\u8ba4\u5177\u4f53\u5230\u67d0\u4e2a\u5206\u7247<\/li>\n<li>\u539f\u59cbSQL\u63d2\u5165\u7684\u5b57\u6bb5\u5fc5\u987b\u5305\u542b\u5206\u7247\u5b57\u6bb5<\/li>\n<li>\u539f\u59cbSQL\u4e2d\u5305\u542b\u7684\u5206\u7247\u5b57\u6bb5\u548c\u6ce8\u89e3SQL\u4e2d\u7684\u5206\u7247\u5b57\u6bb5\u786e\u5b9a\u7684\u5206\u7247\u52a1\u5fc5\u8981\u4e00\u81f4<\/li>\n<li>\u5bf9\u4e8einsert \u2026 select\u8fd9\u79cd\u8bed\u53e5\uff0c\u8bf7\u52a1\u5fc5\u786e\u8ba4\u63d2\u5165\u7684\u8bb0\u5f55\u90fd\u5728\u5f53\u524d\u67e5\u627e\u5230\u7684\u5206\u7247\u4e0a<br \/>\n<strong>\u975e\u5206\u7247\u8868<\/strong><\/li>\n<li>\u6ce8\u89e3SQL\u5fc5\u987b\u80fd\u5177\u4f53\u786e\u8ba4\u5230\u67d0\u4e2a\u5206\u7247<\/li>\n<li>\u6ce8\u89e3SQL\u5305\u542b\u7684\u5206\u7247\u5b57\u6bb5\u5176\u5206\u7247\u4e0a\u5fc5\u987b\u5305\u542b\u8fd9\u4e2a\u975e\u5206\u7247\u8868<br \/>\n<strong>Delete<\/strong><\/li>\n<li>\u5bf9\u4e8e\u5206\u7247\u8868\u4f7f\u7528\u8981\u5220\u9664\u8bb0\u5f55\u7684\u8868\u505a\u6ce8\u89e3SQL<br \/>\n<strong>Update<\/strong><\/li>\n<li>\u5bf9\u4e8e\u5206\u7247\u8868\u7528\u6240\u8981\u66f4\u65b0\u7684\u8868\u505a\u6ce8\u89e3SQL<\/li>\n<li>\u7981\u6b62\u66f4\u65b0\u5206\u7247\u8868\u7684\u5206\u7247\u5217<\/li>\n<li>\u6839\u636e\u4e1a\u52a1\u9700\u8981\u6dfb\u52a0\u6ce8\u89e3Sql\u7684\u5206\u7247\u5b57\u6bb5\u503c<br \/>\n<strong>Call<\/strong><\/li>\n<li>\u82e5\u662f\u8981\u5728\u6240\u6709\u7684\u5206\u7247\u4e0a\u90fd\u6267\u884c\u5b58\u50a8\u8fc7\u7a0b\uff0c\u5219\u4f7f\u7528\u4e00\u4e2a\u5728\u6240\u6709\u5206\u7247\u4e0a\u90fd\u5305\u542b\u7684\u8868\uff0c\u4e0d\u6dfb\u52a0\u4efb\u4f55\u5206\u7247\u6761\u4ef6 \u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b<\/li>\n<li>\u82e5\u662f\u5355\u4e2a\u5206\u7247\u6267\u884c\uff0c\u4f7f\u7528\u80fd\u786e\u8ba4\u5230\u8fd9\u4e2a\u5206\u7247\u7684\u8868\u4ee5\u53ca\u5206\u7247\u6761\u4ef6<br \/>\n\u8865\u5145\u8bf4\u660e:<br \/>\n\u4f7f\u7528\u6ce8\u89e3\u5e76\u4e0d\u989d\u5916\u589e\u52a0MyCat\u7684\u6267\u884c\u65f6\u95f4\uff1b\u4ece\u89e3\u6790\u590d\u6742\u5ea6\u4ee5\u53ca\u6027\u80fd\u8003\u8651\uff0c\u6ce8\u89e3SQL\u5e94\u5c3d\u91cf\u7b80\u5355\u3002\u81f3\u4e8e\u4e00\u4e2aSQL\u4f7f\u7528\u6ce8\u89e3\u548c\u4e0d\u4f7f\u7528\u6ce8\u89e3\u7684\u6027\u80fd\u5bf9\u6bd4\uff0c\u4e0d\u5b58\u5728\u53c2\u8003\u610f\u4e49\uff0c\u56e0\u4e3a\u524d\u63d0\u662fMyCat\u4e0d\u652f\u6301\u7684SQL\u624d\u4f7f\u7528\u6ce8\u89e3\u3002<\/li>\n<\/ul>\n<h2 id=\"\u6ce8\u89e3\u4f7f\u7528\u793a\u4f8b\"><a name=\"t1\"><\/a>\u6ce8\u89e3\u4f7f\u7528\u793a\u4f8b<\/h2>\n<p>\u6ce8\u89e3\u652f\u6301\u7684\u2019!\u2019\u4e0d\u88abmysql\u5355\u5e93\u517c\u5bb9\uff0c<br \/>\n\u6ce8\u89e3\u652f\u6301\u7684\u2019#\u2019\u4e0d\u88abmybatis\u517c\u5bb9<br \/>\n\u65b0\u589e\u52a0mycat\u5b57\u7b26\u524d\u7f00\u6807\u5fd7Hintsql:\u201d\/<em>* mycat:\u00a0<\/em>\/\u201d<br \/>\n\u4ece1.6\u5f00\u59cb\u652f\u6301\u4e09\u79cd\u6ce8\u89e3\u65b9\u5f0f\uff1a<\/p>\n<pre class=\"prettyprint\"><code class=\"hljs java has-numbering\"><span class=\"hljs-comment\">\/*#mycat:db_type=master*\/<\/span> select * from travelrecord <span class=\"hljs-comment\">\/*!mycat:db_type=slave*\/<\/span> select * from travelrecord <span class=\"hljs-javadoc\">\/**mycat:db_type=master*\/<\/span> select * from travelrecord<\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p><strong>Mycat\u7aef\u6267\u884c\u5b58\u50a8\u521b\u5efa\u8868\u6216\u5b58\u50a8\u8fc7\u7a0b\u4e3a\uff1a<\/strong><br \/>\n\u5b58\u50a8\u8fc7\u7a0b\uff1a<\/p>\n<pre class=\"prettyprint\"><code class=\"hljs sql has-numbering\"><span class=\"hljs-comment\">\/*!mycat: sql=select 1 from test *\/<\/span> <span class=\"hljs-operator\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">PROCEDURE<\/span> <span class=\"hljs-string\">`test_proc`<\/span>() <span class=\"hljs-keyword\">BEGIN<\/span> <span class=\"hljs-keyword\">END<\/span> ;<\/span><\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p>\u8868\uff1a<\/p>\n<pre class=\"prettyprint\"><code class=\"hljs sql has-numbering\"> <span class=\"hljs-comment\">\/*!mycat: sql=select 1 from test *\/<\/span><span class=\"hljs-operator\"><span class=\"hljs-keyword\">create<\/span> <span class=\"hljs-keyword\">table<\/span> test2(id <span class=\"hljs-keyword\">int<\/span>);<\/span><\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p>\u6ce8\u610f\u6ce8\u89e3\u4e2d\u8bed\u53e5\u662f\u8282\u70b9\u7684\u8868\u8bf7\u66ff\u6362\u6210\u81ea\u5df1\u8868\u5982select 1 from \u8868 \uff0c\u6ce8\u89e3\u5185\u8bed\u53e5\u67e5\u51fa\u6765\u7684\u6570\u636e\u5728\u54ea\u4e2a\u5206\u7247\uff0c\u6570\u636e\u5728\u90a3\u4e2a\u8282\u70b9\u5f80\u54ea\u4e2a\u8282\u70b9\u5efa.<br \/>\n<strong>\u7279\u6b8a\u8bed\u53e5\u81ea\u5b9a\u4e49\u5206\u7247\uff1a<\/strong><\/p>\n<pre class=\"prettyprint\"><code class=\"hljs applescript has-numbering\"> \/*!mycat: sql=select <span class=\"hljs-number\">1<\/span> <span class=\"hljs-keyword\">from<\/span> test *\/insert <span class=\"hljs-keyword\">into<\/span> t_user(<span class=\"hljs-property\">id<\/span>,<span class=\"hljs-property\">name<\/span>) select <span class=\"hljs-property\">id<\/span>,<span class=\"hljs-property\">name<\/span> <span class=\"hljs-keyword\">from<\/span> t_user2;<\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p><strong>\u8bfb\u5199\u5206\u79bb<\/strong><br \/>\n\u914d\u7f6e\u4e86Mycat\u8bfb\u5199\u5206\u79bb\u540e\uff0c\u9ed8\u8ba4\u67e5\u8be2\u90fd\u4f1a\u4ece\u8bfb\u8282\u70b9\u83b7\u53d6\u6570\u636e\uff0c\u4f46\u662f\u6709\u4e9b\u573a\u666f\u9700\u8981\u83b7\u53d6\u5b9e\u65f6\u6570\u636e\uff0c\u5982\u679c\u4ece\u8bfb\u8282\u70b9\u83b7\u53d6\u6570\u636e\u53ef\u80fd\u56e0\u5ef6\u65f6\u800c\u65e0\u6cd5\u5b9e\u73b0\u5b9e\u65f6\uff0cMycat\u652f\u6301\u901a\u8fc7\u6ce8\u89e3\/<em>balance<\/em>\/\u6765\u5f3a\u5236\u4ece\u5199\u8282\u70b9\u67e5\u8be2\u6570\u636e\uff1a<\/p>\n<pre class=\"prettyprint\"><code class=\"hljs livecodeserver has-numbering\"><span class=\"hljs-operator\">a<\/span>. \u4e8b\u52a1\u5185\u7684SQL\uff0c\u9ed8\u8ba4\u8d70\u5199\u8282\u70b9\uff0c\u4ee5\u6ce8\u89e3<span class=\"hljs-comment\">\/*balance*\/<\/span>\u5f00\u5934\uff0c\u5219\u4f1a\u6839\u636eschema.xml\u7684dataHost\u6807\u7b7e\u5c5e\u6027\u7684balance=\u201c<span class=\"hljs-number\">1<\/span>\u201d\u6216\u201c<span class=\"hljs-number\">2<\/span>\u201d\u53bb\u83b7\u53d6\u8282\u70b9 <\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<pre class=\"prettyprint\"><code class=\"hljs sql has-numbering\">b. \u975e\u4e8b\u52a1\u5185\u7684SQL\uff0c\u5f00\u542f\u8bfb\u5199\u5206\u79bb\u9ed8\u8ba4\u6839\u636ebalance=\u201c1\u201d\u6216\u201c2\u201d\u53bb\u83b7\u53d6\uff0c\u4ee5\u6ce8\u89e3<span class=\"hljs-comment\">\/*balance*\/<\/span>\u5f00\u5934\u5219\u4f1a\u8d70\u5199\u8282\u70b9\u89e3\u51b3\u90e8\u5206\u5df2\u7ecf\u5f00\u542f\u8bfb\u5199\u5206\u79bb\uff0c\u4f46\u662f\u9700\u8981\u5f3a\u4e00\u81f4\u6027\u6570\u636e\u5b9e\u65f6\u83b7\u53d6\u7684\u573a\u666f\u8d70\u5199\u8282\u70b9\n <span class=\"hljs-comment\">\/*balance*\/<\/span> <span class=\"hljs-operator\"><span class=\"hljs-keyword\">select<\/span> a.* <span class=\"hljs-keyword\">from<\/span> customer a <span class=\"hljs-keyword\">where<\/span> a.company_id=<span class=\"hljs-number\">1<\/span>;<\/span><\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<li>2<\/li>\n<\/ul>\n<p><strong>\u591a\u8868<\/strong><\/p>\n<pre class=\"prettyprint\"><code class=\"hljs livecodeserver has-numbering\"> ShareJoin <span class=\"hljs-comment\">\/*!mycat:catlet=demo.catlets.ShareJoin *\/<\/span> select <span class=\"hljs-operator\">a<\/span>.*,b.id, b.name <span class=\"hljs-keyword\">as<\/span> tit <span class=\"hljs-built_in\">from<\/span> customer <span class=\"hljs-operator\">a<\/span>,company b <span class=\"hljs-command\"><span class=\"hljs-keyword\">on<\/span> <span class=\"hljs-title\">a<\/span>.<span class=\"hljs-title\">company_id<\/span>=<span class=\"hljs-title\">b<\/span>.<span class=\"hljs-title\">id<\/span>;<\/span><\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p><strong>\u8bfb\u5199\u5206\u79bb\u6570\u636e\u6e90\u9009\u62e9<\/strong><\/p>\n<pre class=\"prettyprint\"><code class=\"hljs cs has-numbering\"><span class=\"hljs-comment\">\/*!mycat:db_type=master*\/<\/span> <span class=\"hljs-keyword\">select<\/span> * <span class=\"hljs-keyword\">from<\/span> travelrecord <span class=\"hljs-comment\">\/*!mycat:db_type=slave*\/<\/span> <span class=\"hljs-keyword\">select<\/span> * <span class=\"hljs-keyword\">from<\/span> travelrecord <span class=\"hljs-comment\">\/*#mycat:db_type=master*\/<\/span> <span class=\"hljs-keyword\">select<\/span> * <span class=\"hljs-keyword\">from<\/span> travelrecord <span class=\"hljs-comment\">\/*#mycat:db_type=slave*\/<\/span> <span class=\"hljs-keyword\">select<\/span> * <span class=\"hljs-keyword\">from<\/span> travelrecord<\/code><\/pre>\n<ul class=\"pre-numbering\">\n<li>1<\/li>\n<\/ul>\n<p><strong>\u591a\u79df\u6237\u652f\u6301<\/strong><br \/>\n\u901a\u8fc7\u6ce8\u89e3\u65b9\u5f0f\u5728\u914d\u7f6e\u591a\u4e2aschema\u60c5\u51b5\u4e0b\uff0c\u6307\u5b9a\u8d70\u54ea\u4e2a\u914d\u7f6e\u7684schema\u3002<br \/>\nweb\u90e8\u5206\u4fee\u6539\uff1a a.\u5728\u7528\u6237\u767b\u5f55\u65f6\uff0c\u5728\u7ebf\u7a0b\u53d8\u91cf\uff08ThreadLocal\uff09\u4e2d\u8bb0\u5f55\u79df\u6237\u7684id b.\u4fee\u6539jdbc\u7684\u5b9e\u73b0\uff1a\u5728\u63d0\u4ea4sql\u65f6\uff0c\u4eceThreadLocal\u4e2d\u83b7\u53d6\u79df\u6237id, \u6dfb\u52a0sql \u6ce8\u91ca\uff0c\u628a\u79df\u6237\u7684schema \u653e\u5230\u6ce8\u91ca\u4e2d\u3002\u4f8b\u5982\uff1a\/<em>!mycat : schema = test_01\u00a0<\/em>\/ sql ;<br \/>\n\u5728db\u524d\u9762\u5efa\u7acbproxy\u5c42\uff0c\u4ee3\u7406\u6240\u6709web\u8fc7\u6765\u7684\u6570\u636e\u5e93\u8bf7\u6c42\u3002proxy\u5c42\u662f\u7528mycat\u5b9e\u73b0\u7684\uff0cweb\u63d0\u4ea4\u7684sql\u8fc7\u6765\u65f6\u5728\u6ce8\u91ca\u4e2d\u6307\u5b9aschema, proxy\u5c42\u6839\u636e\u6307\u5b9a\u7684schema\u8f6c\u53d1sql\u8bf7\u6c42\u3002<\/p>\n<pre class=\"prettyprint\"><code class=\"hljs fix has-numbering\"><span class=\"hljs-attribute\"> \/*!mycat : schema <\/span>=<span class=\"hljs-string\"> test_01 *\/ sql ;<\/span><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6ce8\u89e3\u539f\u7406 \u6982\u5ff5\uff1a MyCat\u5bf9\u81ea\u8eab\u4e0d\u652f\u6301\u7684Sql\u8bed\u53e5\u63d0\u4f9b\u4e86\u4e00\u79cd\u89e3\u51b3\u65b9\u6848\u2014\u2014\u5728\u8981\u6267\u884c\u7684SQL\u8bed\u53e5\u524d\u6dfb\u52a0\u989d\u5916\u7684\u4e00\u6bb5\u7531\u6ce8\u89e3SQL\u7ec4\u7ec7\u7684\u4ee3\u7801\uff0c\u8fd9\u6837Sql\u5c31\u80fd\u6b63\u786e\u6267\u884c\uff0c\u8fd9\u6bb5\u4ee3\u7801\u79f0\u4e4b\u4e3a\u201c\u6ce8\u89e3\u201d\u3002\u6ce8\u89e3\u7684\u4f7f\u7528\u76f8\u5f53\u4e8e\u5bf9mycat\u4e0d\u652f\u6301\u7684sql\u8bed\u53e5\u505a\u4e86\u4e00\u5c42\u900f\u660e\u4ee3\u7406\u8f6c\u53d1\uff0c\u76f4\u63a5\u4ea4\u7ed9\u76ee\u6807\u7684\u6570\u636e\u8282\u70b9\u8fdb\u884csql\u8bed\u53e5\u6267\u884c\uff0c\u5176\u4e2d\u6ce8\u89e3SQL\u7528\u4e8e\u786e\u5b9a\u6700\u7ec8\u6267\u884cSQL\u7684\u6570\u636e\u8282\u70b9\u3002\u6ce8\u89e3\u7684\u5f62\u5f0f\u662f\uff1a \/*!mycat: sql=\u6ce8\u89e3Sql\u8bed\u53e5*\/ 1 \u6ce8\u89e3\u7684\u4f7f\u7528\u65b9\u5f0f\u662f\uff1a \/*!mycat: sql=\u6ce8\u89e3Sql\u8bed\u53e5*\/\u771f\u6b63\u6267\u884cSql 1 \u4f7f\u7528\u65f6\u5c06=\u53f7\u540e\u7684\u201c\u6ce8\u89e3Sql\u8bed\u53e5\u201d\u66ff\u6362\u4e3a\u9700\u8981\u7684Sql\u8bed\u53e5\u5373\u53ef\uff0c\u540e\u9762\u4f1a\u63d0\u5230\u5177\u4f53\u7684\u7528\u6cd5\u3002 \u539f\u7406\uff1a MyCat\u6267\u884cSQL\u8bed\u53e5\u7684\u6d41\u7a0b\u662f\u5148\u8fdb\u884cSQL\u89e3\u6790\u5904\u7406\uff0c\u89e3\u6790\u51fa\u5206\u7247\u4fe1\u606f(\u8def\u7531\u4fe1\u606f)\u540e\uff0c\u7136\u540e\u5230\u8be5\u5206\u7247\u5bf9\u5e94\u7684\u7269\u7406\u5e93\u4e0a\u53bb\u6267\u884c\uff1b\u82e5\u4f20\u5165\u7684SQL\u8bed\u53e5MyCat\u65e0\u6cd5\u89e3\u6790\uff0c\u5219MyCat\u4e0d\u4f1a\u53bb\u6267\u884c\uff1b\u800c\u6ce8\u89e3\u5219\u662f\u544a\u8bc9MyCat\u6309\u7167\u6ce8\u89e3\u5185\u7684SQL\uff08\u79f0\u4e4b\u4e3a\u6ce8\u89e3SQL\uff09\u53bb\u8fdb\u884c\u89e3\u6790\u5904\u7406\uff0c\u89e3\u6790\u51fa\u5206\u7247\u4fe1\u606f\u540e\uff0c\u5c06\u6ce8\u89e3\u540e\u771f\u6b63\u8981\u6267\u884c\u7684SQL\u8bed\u53e5\uff08\u79f0\u4e4b\u4e3a\u539f\u59cbSQL\uff09\u53d1\u9001\u5230\u8be5\u5206\u7247\u5bf9\u5e94\u7684\u7269\u7406\u5e93\u4e0a\u53bb\u6267\u884c\u3002 \u4ece\u4e0a\u9762\u7684\u539f\u7406\u53ef\u4ee5\u770b\u5230\uff0c\u6ce8\u89e3\u53ea\u662f\u544a\u8bc9MyCat\u5230\u4f55\u5904\u53bb\u6267\u884c\u539f\u59cbSQL\uff1b\u56e0\u800c\u4f7f\u7528\u6ce8\u89e3\u524d\uff0c\u8981\u6e05\u695a\u7684\u77e5\u9053\u8be5\u539f\u59cbSQL\u53bb\u54ea\u4e2a\u5206\u7247\u6267\u884c\uff0c\u7136\u540e\u5728\u6ce8\u89e3SQL\u4e2d\u4e5f\u6307\u5411\u8be5\u5206\u7247\uff0c\u8fd9\u6837\u624d\u80fd\u4f7f\u7528\uff01\u4f8b\u5b50\u4e2d\u7684sharding_id=10010 \u5373\u662f\u6307\u660e\u5206\u7247\u4fe1\u606f\u7684\u3002 \u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u82e5\u6ce8\u89e3SQL\u6ca1\u6709\u80fd\u660e\u786e\u5230\u5177\u4f53\u67d0\u4e2a\u5206\u7247\uff0c\u8b6c\u5982\u4f8b\u5b50\u4e2d\u7684\u6ce8\u89e3SQL\u6ca1\u6709\u6dfb\u52a0sharding_id=10010\u8fd9\u4e2a\u6761\u4ef6\uff0c\u5219MyCat\u4f1a\u5c06\u539f\u59cbSQL\u53d1\u9001\u5230persons\u8868\u6240\u5728\u7684\u6240\u6709\u5206\u7247\u4e0a\u53bb\u6267\u884c\u53bb\uff0c\u8fd9\u6837\u9020\u6210\u7684\u540e\u679c\u82e5\u662f\u63d2\u5165\u8bed\u53e5\uff0c\u5219\u5728\u591a\u4e2a\u5206\u7247\u4e0a\u90fd\u5b58\u5728\u91cd\u590d\u8bb0\u5f55\uff0c\u540c\u6837\u67e5\u8be2\u3001\u66f4\u65b0\u3001\u5220\u9664\u64cd\u4f5c\u4e5f\u4f1a\u5f97\u5230\u9519\u8bef\u7684\u7ed3\u679c\uff01 \u89e3\u51b3\u95ee\u9898\uff1a MySql\u4e0d\u652f\u6301\u7684\u8bed\u6cd5\u7ed3\u6784\uff0c\u5982insert \u2026select\u2026 \u540c\u4e00\u4e2a\u5b9e\u4f8b\u5185\u7684\u8de8\u5e93\u5173\u8054\u67e5\u8be2\uff0c\u5982\u7528\u6237\u5e93\u548c\u5e73\u53f0\u5e93\u5185\u7684\u8868\u5173\u8054 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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