python - 错误 : sqlite3. 操作错误 : no such table: main. m

Question

我在 python 中有一个非常简单的代码，基本上我尝试为数据库中的每个表创建索引(已经存在)。数据库和我的脚本文件位于同一文件夹中。获取表名称列表并尝试为第一个表创建索引后，我收到以下错误消息:

c.execute("CREATE INDEX IF NOT EXISTS "+tableName[m]+"Date ON "+tableName[m]+" (date)"); sqlite3.OperationalError: no such table: main.m

数据库中没有任何具有此名称的表(main.m)!

我的代码:

import sqlite3
DBname = 'myDatabase.sqlite';
# connect to the database
conn = sqlite3.connect(DBname);
c    = conn.cursor();
c.execute("SELECT name FROM sqlite_master WHERE type='table'");
tables = c.fetchall();
print("\nCreating the indices for each table in the database ...");
for m in range (0,len(tables)):
    tableName = tables[m][0];
    print(tableName)
    c.execute("CREATE INDEX IF NOT EXISTS "+tableName[m]+"Date ON "+tableName[m]+" (date)");
    c.execute("CREATE INDEX IF NOT EXISTS "+tableName[m]+"Year ON "+tableName[m]+" (year)");
conn.close()

感谢您的帮助!

Answer 1

如果 tableName 变量根据您的注释显示正确的表名称，则在创建 sql 语句时只需使用 tableName 而不是 tableName[m] :

c.execute("CREATE INDEX IF NOT EXISTS "+tableName+"Date ON "+tableName+" (date)");
c.execute("CREATE INDEX IF NOT EXISTS "+tableName+"Year ON "+tableName+" (year)");