database - 使用存储过程模拟 postgresql

Question

我一直在浏览 https://github.com/DATA-DOG/go-sqlmock 的测试文件弄清楚如何创建用于模拟目的的存储过程。我有:

_, err = db.Exec(`
    CREATE OR REPLACE FUNCTION val() RETURNS INT AS 
        $$ SELECT 1; $$ 
    LANGUAGE sql;   
`)

if err != nil {
    t.Fatal(err)
}

我得到:

all expectations were already fulfilled, call to exec 'CREATE OR REPLACE FUNCTION val() RETURNS INT AS $$ SELECT 1; $$ LANGUAGE sql;' query with args [] was not expected

相反，如果我尝试使用

        mock.ExpectExec(`
            CREATE OR REPLACE FUNCTION val() RETURNS INT AS
                $$ SELECT 1; $$
            LANGUAGE sql;
        `,
        ).WillReturnResult(sqlmock.NewResult(0, 0))

        if err := mock.ExpectationsWereMet(); err != nil {
            t.Fatal(err)
        }

我得到:

there is a remaining expectation which was not matched: ExpectedExec => expecting Exec which:
              - matches sql: 'CREATE OR REPLACE FUNCTION val() RETURNS INT AS $$ SELECT 1; $$ LANGUAGE sql;'
              - is without arguments
              - should return Result having:
                  LastInsertId: 0
                  RowsAffected: 0

我真的很困惑如何设置一个基本的存储过程。

Answer 1

sqlmock 库对此非常有效。

但请注意，ExpectExec 接收正则表达式以匹配:

// ExpectExec expects Exec() to be called with sql query
// which match sqlRegexStr given regexp.
// the *ExpectedExec allows to mock database response
ExpectExec(sqlRegexStr string) *ExpectedExec

您正在向该函数发送您期望接收的确切字符串，无需任何转义。

要转义字符串，添加:

import (
   "regexp"
)

然后在添加期望时，转义您的字符串(注意 regexp.QuoteMeta):

mock.ExpectExec(regexp.QuoteMeta(`
    CREATE OR REPLACE FUNCTION val() RETURNS INT AS
        $$
        SELECT 1;
        $$
    LANGUAGE sql;
`),
).WillReturnResult(sqlmock.NewResult(0, 0))

这样，转义的正则表达式将匹配您的 exec 命令。