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)};`);
}