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How would this look like? How do you add this table to a database?

How would this look like? How do you add this table to a database?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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How would this look like? How do you add this table to a database?
**Educational Website Transcription** --- **Lab Instructions: Creating Tables in Databases** In this lab, you will build a function to handle one query: 1. **CREATE TABLE <NAME> <ID> <ID> ...** - `<ID>` represents the names of table columns. ### Selecting a Database Since the system manages multiple databases, users must select which database they wish to create their tables in. The command to select a database is: ``` USE <DATABASENAME> ``` Here, `<DATABASENAME>` is the database where the user intends to create tables. This command updates the global variable `currentDB` to `<DATABASENAME>`, which is necessary for this lab. ### LAB Exercise **Objective**: You will not alter anything in `main`. Your task is to write the code for an `addTable` function. #### CREATE TABLE Command This command establishes the linkage from Databases to Tables. In the `main` function of `lab1.o.cpp`, locate the case for `CREATE` which calls `createTable`. This function is pivotal for creating tables. It accepts a name and string with options. The options vector lists the column names, while `createTable` uses an intermediate boolean-returning function, `addTable`. #### addTable Function Prototype: ```cpp bool addTable(string, const vector<string>&) ``` ##### Steps for Adding a Table 1. **Table Check**: Determine if the table already exists. - Open the CSV file for the current database at: ``` "csv/" + currentDB + "_tables.csv" ``` - Skip headers, fetch the first row, and utilize `vectorizeRow(string)`. - The `vectorizeRow` returns a structure `[DB, exTable, 2]`. - If the table exists, output: `error: Table already exists.` 2. **Creating a Table**: If absent, append to the CSV. - Construct a new CSV row with: ``` currentDB,tableName,columnCount ``` - Insert this at: ``` "csv/" + currentDB + "_tables.csv" ``` - Write the updated file, adding the new table structure. **Conclusion**: This lab ensures you understand table creation in databases, manage database selections, and use file operations efficiently. --- **Notes**: - Follow step-by
Transcribed Image Text:**Educational Website Transcription** --- **Lab Instructions: Creating Tables in Databases** In this lab, you will build a function to handle one query: 1. **CREATE TABLE <NAME> <ID> <ID> ...** - `<ID>` represents the names of table columns. ### Selecting a Database Since the system manages multiple databases, users must select which database they wish to create their tables in. The command to select a database is: ``` USE <DATABASENAME> ``` Here, `<DATABASENAME>` is the database where the user intends to create tables. This command updates the global variable `currentDB` to `<DATABASENAME>`, which is necessary for this lab. ### LAB Exercise **Objective**: You will not alter anything in `main`. Your task is to write the code for an `addTable` function. #### CREATE TABLE Command This command establishes the linkage from Databases to Tables. In the `main` function of `lab1.o.cpp`, locate the case for `CREATE` which calls `createTable`. This function is pivotal for creating tables. It accepts a name and string with options. The options vector lists the column names, while `createTable` uses an intermediate boolean-returning function, `addTable`. #### addTable Function Prototype: ```cpp bool addTable(string, const vector<string>&) ``` ##### Steps for Adding a Table 1. **Table Check**: Determine if the table already exists. - Open the CSV file for the current database at: ``` "csv/" + currentDB + "_tables.csv" ``` - Skip headers, fetch the first row, and utilize `vectorizeRow(string)`. - The `vectorizeRow` returns a structure `[DB, exTable, 2]`. - If the table exists, output: `error: Table already exists.` 2. **Creating a Table**: If absent, append to the CSV. - Construct a new CSV row with: ``` currentDB,tableName,columnCount ``` - Insert this at: ``` "csv/" + currentDB + "_tables.csv" ``` - Write the updated file, adding the new table structure. **Conclusion**: This lab ensures you understand table creation in databases, manage database selections, and use file operations efficiently. --- **Notes**: - Follow step-by
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