DB2 table data migration db2 command db2 download db2 database introductory tutorial

The system uses a remote database. The location is in the USA and the connection speed is extremely slow. The DBA doesn’t guide the database
I had to write a database table migration method myself. But it can only be imported slowly one table at a time. Written in PHP

<code><span><?php</span><span>//原数据库</span><span>$databaseOri</span> = <span>'原数据库名称'</span>;
    <span>$hostnameOri</span> = <span>'IP地址'</span>;
    <span>$portOri</span> = <span>'端口号'</span>;
    <span>$userOri</span> = <span>'用户名'</span>;
    <span>$passwordOri</span> = <span>'密码'</span>;
    <span>$csOri</span>=<span>"DATABASE=$databaseOri;HOSTNAME=$hostnameOri;PORT=$portOri;PROTOCOL=TCPIP;UID=$userOri;PWD=$passwordOri;"</span>;
    <span>$dbOri</span> = db2_connect (<span>$csOri</span>, <span>$userOri</span>, <span>$passwordOri</span>);
    <span>//目标数据库</span><span>$databaseDes</span> = <span>'要转移到的数据库的名称'</span>;
    <span>$hostnameDes</span> = <span>'IP地址'</span>;
    <span>$portDes</span> = <span>'端口号'</span>;
    <span>$userDes</span> = <span>'用户名'</span>;
    <span>$passwordDes</span> = <span>'密码'</span>;
    <span>$csDes</span>=<span>"DATABASE=$databaseDes;HOSTNAME=$hostnameDes;PORT=$portDes;PROTOCOL=TCPIP;UID=$userDes;PWD=$passwordDes;"</span>;
    <span>$dbDes</span> = db2_connect (<span>$csDes</span>, <span>$userDes</span>, <span>$passwordDes</span>);

    <span>//执行sql的方法</span><span><span>function</span><span>fetcher</span><span>(<span>$db</span>, <span>$query</span>,<span>$par</span> = array<span>()</span>)</span>{</span><span>$stmt</span> = db2_prepare(<span>$db</span>, <span>$query</span>);
        <span>$res</span>=<span>array</span>();
        <span>if</span>(<span>$stmt</span>) {
          <span>//print_r($stmt);</span><span>$ex</span> = db2_execute(<span>$stmt</span>,<span>$par</span>);
          <span>if</span>(<span>$ex</span>) {
            <span>try</span>{
                <span>while</span>(<span>$row</span> = db2_fetch_assoc(<span>$stmt</span>)) {
                    array_push(<span>$res</span>, <span>$row</span>);
                } 
            }<span>catch</span>(<span>Exception</span><span>$e</span>){}
          }<span>else</span>{
            print_r(<span>$query</span>);
          }
        }
        <span>return</span><span>$res</span>;
    }

    <span>//插入数据库的方法</span><span><span>function</span><span>insertIntoDes</span><span>(<span>$db</span>, <span>$query</span>,<span>$par</span> = array<span>()</span>)</span>{</span><span>$stmt</span> = db2_prepare(<span>$db</span>, <span>$query</span>);
        <span>$res</span>=<span>array</span>();
        <span>if</span>(<span>$stmt</span>) {
          <span>$ex</span> = db2_execute(<span>$stmt</span>,<span>$par</span>);
          <span>if</span>(!<span>$ex</span>){
            print_r(<span>$query</span>);
          }
        }
        <span>return</span><span>$res</span>;
    }

    <span><span>function</span><span>transferDB</span><span>(<span>$tableName</span>,<span>$dbOri</span>,<span>$dbDes</span>)</span> {</span><span>//拼出要转移的table的所有字段名</span><span>$tableCloums</span> = fetcher(
            <span>$dbOri</span>,
            <span>"select NAME from sysibm.syscolumns where tbname='"</span>.<span>$tableName</span>.<span>"'"</span>,
            <span>array</span>()
        );
        <span>$tableParams</span> = <span>""</span>;
        <span>$insertParamsLength</span> = count(<span>$tableCloums</span>);
        <span>for</span>(<span>$temp</span>=<span>0</span>;<span>$temp</span><<span>$insertParamsLength</span>;<span>$temp</span>++){
            <span>$tmpName</span> = <span>$tableCloums</span>[<span>$temp</span>][<span>"NAME"</span>];
            <span>$tableParams</span> = <span>$tableParams</span>.<span>$tmpName</span>;
            <span>//print_r($tableCloums[$temp]["NAME"]);</span><span>if</span>(<span>$temp</span> < <span>$insertParamsLength</span> - <span>1</span> ){
                <span>$tableParams</span> = <span>$tableParams</span>.<span>","</span>;
            }
        }
        <span>//找出table的主键</span><span>$resultKeyArray</span> = fetcher(
            <span>$dbOri</span>,
            <span>"select NAME from sysibm.syscolumns where tbname='"</span>.<span>$tableName</span>.<span>"' and keyseq = '1'"</span>,
            <span>array</span>()
        );
        <span>if</span>(<span>$resultKeyArray</span>[<span>0</span>][<span>"NAME"</span>]){
            <span>$keyCloum</span> = <span>$resultKeyArray</span>[<span>0</span>][<span>"NAME"</span>];
        }<span>else</span>{
            <span>$keyCloum</span> = <span>"ID"</span>;
        }


        <span>//获取表的所有行数，因为如果表太大有几百万行的话，一下全导入到内存中会照成内存溢出</span><span>$count</span> = fetcher(
            <span>$dbOri</span>,
            <span>"select COUNT(*) from public."</span>.<span>$tableName</span>,
            <span>array</span>()
        );
        <span>$dataCount</span> = <span>$count</span>[<span>0</span>][<span>1</span>];
        <span>//确定要执行几次</span><span>$executeloops</span> = floor(<span>$dataCount</span> / <span>10000</span> + <span>1</span>);
        <span>//$executeloops = 1;</span><span>//循环执行</span><span>for</span>(<span>$i</span>=<span>0</span>;<span>$i</span><<span>$executeloops</span>;<span>$i</span>++){
            <span>$pageIndex</span> = <span>$i</span>;
            <span>$beginIndex</span> = <span>$i</span>*<span>10000</span>;
            <span>$endIndex</span> = (<span>$i</span>+<span>1</span>) * <span>10000</span>;
            <span>//通过分页查询，每次从原表中获取1万条数据</span><span>$getDataFromOriTab</span> = 
            <span>"select "</span>.<span>$tableParams</span>.<span>" from (
                select ROW_NUMBER() OVER(ORDER BY "</span>.<span>$keyCloum</span>.<span>" DESC) AS ROWNUM, "</span>.<span>$tableParams</span>.<span>" from public."</span>.<span>$tableName</span>.<span>"  
            ) a where ROWNUM > "</span>.<span>$beginIndex</span>.<span>" and ROWNUM <= "</span>.<span>$endIndex</span> ;
            <span>//fwrite($myfile, $getDataFromOriTab);</span><span>$tmpData</span> = fetcher(<span>$dbOri</span>,<span>$getDataFromOriTab</span>,<span>array</span>());
            <span>//拼接出insert语句中字段的value的值</span><span>$valueStr</span> = <span>""</span>;
            <span>foreach</span>(<span>$tmpData</span><span>as</span><span>$index</span> => <span>$row</span>){
                <span>$valueStr</span> = <span>""</span>;
                <span>foreach</span> (<span>$row</span><span>as</span><span>$cloumName</span> => <span>$value</span>) {
                    <span>if</span>(<span>empty</span>(<span>$value</span>)){
                        <span>$valueStr</span> = <span>$valueStr</span> . <span>"'',"</span>;
                    }<span>else</span><span>if</span> (is_null(<span>$value</span>)) {
                        <span>$valueStr</span> = <span>$valueStr</span> . <span>"null,"</span>;
                    }<span>else</span>{
                        <span>$valueStr</span> = <span>$valueStr</span> . <span>"$value,"</span>;
                    }
                }
                <span>$valueStr</span> = substr(<span>$valueStr</span>, <span>0</span>, -<span>1</span>);
                <span>$insertSql</span> = <span>"INSERT INTO public."</span>.<span>$tableName</span>.<span>" ("</span>.<span>$tableParams</span>.<span>") VALUES ("</span>.<span>$valueStr</span>.<span>");"</span>;
                insertIntoDes(<span>$dbDes</span>,<span>$insertSql</span>,<span>array</span>()); 
            }
        }

    }
    <span>//参数为要导的表的表名</span>
    transferDB(<span>"表名"</span>,<span>$dbOri</span>,<span>$dbDes</span>);
<span>?></span></span></code>

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The above has introduced DB2 table data migration, including db2 and migration aspects. I hope it will be helpful to friends who are interested in PHP tutorials.