update

netease_music/sql/export_sql_generator.js

@@ -0,0 +1,44 @@
+const export_gap = 50000000;
+const partition_gap = 50000000;
+const table = "comment_1024";
+const index = "comment_id";
+const exportTablePrefix = "comment_export_";
+
+// 数字转成字符串，同时在前面填充
+function fill(num, fillers, length) {
+    var result = `${num}`;
+    if (result.length < length)
+        result = new Array(length - result.length + 1).join(fillers) + result;
+    return result;
+}
+
+let sqlArr1 = [];
+let sqlArr2 = [];
+let sqlArr3 = [];
+for (let i = 200; i < 300; i++) {
+// for (let i = 100; i < 200; i++) {
+    let where = `${index} >= ${fill(i * export_gap, ' ', 12)} and ${index} < ${fill((i + 1) * export_gap, ' ', 12)}`;
+
+    let sql_create_table = `create table ${exportTablePrefix}${fill(i, '0', 4)} select * from ${table} where ${where};`;
+    sqlArr1.push(sql_create_table);
+
+    let sql_delete_rows = `DELETE FROM ${table} WHERE ${where};`;
+    sqlArr2.push(sql_delete_rows);
+
+    let sql_partition = `  PARTITION p${fill(i, '0', 4)} VALUES LESS THAN (${fill((i + 1) * partition_gap, ' ', 12)})`;
+    sqlArr3.push(sql_partition);
+}
+sqlArr3.push(`  PARTITION p_max VALUES LESS THAN MAXVALUE`);
+
+// 建表
+// console.log(sqlArr1.join('\n'));
+
+// 删除原表数据
+// console.log(sqlArr2.join('\n'));
+
+// 新创建表的分区
+// console.log(`partition (\n${sqlArr3.join(',\n')}\n)`);
+
+for (let i = 107; i < 200; i++) {
+    console.log(`DROP TABLE IF EXISTS comment_export_${fill(i, '0', 4)};`);
+}