Merge branch 'master' of gitlab.com:slon/shad-go-private

go.mod

@@ -11,11 +11,13 @@ require (
 	github.com/gorilla/mux v1.7.4
 	github.com/gorilla/websocket v1.4.2
 	github.com/jonboulle/clockwork v0.1.0
+	github.com/jackc/pgx/v4 v4.6.0
+	github.com/jmoiron/sqlx v1.2.0
 	github.com/spf13/cobra v0.0.5
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.5.1
 	go.uber.org/goleak v1.0.0
 	go.uber.org/zap v1.14.0
-	golang.org/x/net v0.0.0-20190628185345-da137c7871d7
+	golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7
 	golang.org/x/perf v0.0.0-20191209155426-36b577b0eb03
 	golang.org/x/sync v0.0.0-20190423024810-112230192c58
 	golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825

go.sum

@@ -5,17 +5,23 @@ github.com/GoogleCloudPlatform/cloudsql-proxy v0.0.0-20190129172621-c8b1d7a94ddf
 github.com/aclements/go-gg v0.0.0-20170118225347-6dbb4e4fefb0/go.mod h1:55qNq4vcpkIuHowELi5C8e+1yUHtoLoOUR9QU5j7Tes=
 github.com/aclements/go-moremath v0.0.0-20161014184102-0ff62e0875ff/go.mod h1:idZL3yvz4kzx1dsBOAC+oYv6L92P1oFEhUXUB1A/lwQ=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/cockroachdb/apd v1.1.0/go.mod h1:8Sl8LxpKi29FqWXR16WEFZRNSz3SoPzUzeMeY4+DwBQ=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
+github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/go-resty/resty/v2 v2.1.0 h1:Z6IefCpUMfnvItVJaJXWv/pMiiD11So35QgwEELsldE=
 github.com/go-resty/resty/v2 v2.1.0/go.mod h1:dZGr0i9PLlaaTD4H/hoZIDjQ+r6xq8mgbRzHZf7f2J8=
+github.com/go-sql-driver/mysql v1.4.0/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
 github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gofrs/uuid v3.2.0+incompatible h1:y12jRkkFxsd7GpqdSZ+/KCs/fJbqpEXSGd4+jfEaewE=
 github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
 github.com/golang/mock v1.4.1 h1:ocYkMQY5RrXTYgXl7ICpV0IXwlEQGwKIsery4gyXa1U=
@@ -42,21 +48,86 @@ github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANyt
 github.com/jonboulle/clockwork v0.1.0 h1:VKV+ZcuP6l3yW9doeqz6ziZGgcynBVQO+obU0+0hcPo=
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+github.com/jackc/chunkreader v1.0.0 h1:4s39bBR8ByfqH+DKm8rQA3E1LHZWB9XWcrz8fqaZbe0=
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+github.com/jackc/chunkreader/v2 v2.0.0/go.mod h1:odVSm741yZoC3dpHEUXIqA9tQRhFrgOHwnPIn9lDKlk=
+github.com/jackc/chunkreader/v2 v2.0.1 h1:i+RDz65UE+mmpjTfyz0MoVTnzeYxroil2G82ki7MGG8=
+github.com/jackc/chunkreader/v2 v2.0.1/go.mod h1:odVSm741yZoC3dpHEUXIqA9tQRhFrgOHwnPIn9lDKlk=
+github.com/jackc/pgconn v0.0.0-20190420214824-7e0022ef6ba3/go.mod h1:jkELnwuX+w9qN5YIfX0fl88Ehu4XC3keFuOJJk9pcnA=
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+github.com/jackc/pgconn v0.0.0-20190831204454-2fabfa3c18b7/go.mod h1:ZJKsE/KZfsUgOEh9hBm+xYTstcNHg7UPMVJqRfQxq4s=
+github.com/jackc/pgconn v1.5.0 h1:oFSOilzIZkyg787M1fEmyMfOUUvwj0daqYMfaWwNL4o=
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+<<<<<<< HEAD
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+=======
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+>>>>>>> 3aa8192d88a5960f6982f337c8327ba3be7fb1d8
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@@ -67,12 +138,16 @@ github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnIn
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+<<<<<<< HEAD
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 go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
 go.uber.org/goleak v1.0.0 h1:qsup4IcBdlmsnGfqyLl4Ntn3C2XCCuKAE7DwHpScyUo=
@@ -86,7 +161,23 @@ go.uber.org/zap v1.14.0/go.mod h1:zwrFLgMcdUuIBviXEYEH1YKNaOBnKXsx2IPda5bBwHM=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+=======
+github.com/zenazn/goji v0.9.0/go.mod h1:7S9M489iMyHBNxwZnk9/EHS098H4/F6TATF2mIxtB1Q=
+go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
+go.uber.org/goleak v1.0.0 h1:qsup4IcBdlmsnGfqyLl4Ntn3C2XCCuKAE7DwHpScyUo=
+go.uber.org/goleak v1.0.0/go.mod h1:8a7PlsEVH3e/a/GLqe5IIrQx6GzcnRmZEufDUTk4A7A=
+go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
+go.uber.org/zap v1.9.1/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
+go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
+golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
+golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+>>>>>>> 3aa8192d88a5960f6982f337c8327ba3be7fb1d8
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59 h1:3zb4D3T4G8jdExgVU/95+vQXfpEPiMdCaZgmGVxjNHM=
+golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
@@ -98,25 +189,42 @@ golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwL
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7 h1:rTIdg5QFRR7XCaK4LCjBiPbx8j4DQRpdYMnGn/bJUEU=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20170207211851-4464e7848382/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/perf v0.0.0-20191209155426-36b577b0eb03 h1:KBM1Z6efANgwwa1Rns+b3KRyuKhLRVC/OeHhFMFJqOA=
 golang.org/x/perf v0.0.0-20191209155426-36b577b0eb03/go.mod h1:FrqOtQDO3iMDVUtw5nNTDFpR1HUCGh00M3kj2wiSzLQ=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+<<<<<<< HEAD
 golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+=======
+golang.org/x/tools v0.0.0-20190425163242-31fd60d6bfdc/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20190823170909-c4a336ef6a2f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+>>>>>>> 3aa8192d88a5960f6982f337c8327ba3be7fb1d8
 golang.org/x/tools v0.0.0-20191108193012-7d206e10da11/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825 h1:aNQeSIHKi0RWpKA5NO0CqyLjx6Beh5l0LLUEnndEjz0=
 golang.org/x/tools v0.0.0-20200125223703-d33eef8e6825/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20190410155217-1f06c39b4373/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -129,7 +237,11 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+<<<<<<< HEAD
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+=======
+gopkg.in/inconshreveable/log15.v2 v2.0.0-20180818164646-67afb5ed74ec/go.mod h1:aPpfJ7XW+gOuirDoZ8gHhLh3kZ1B08FtV2bbmy7Jv3s=
+>>>>>>> 3aa8192d88a5960f6982f337c8327ba3be7fb1d8
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=

lectures/07-sql/alive/ping.go

@@ -1,3 +1,21 @@
-if err := db.Ping(ctx); err != nil {
+package alive
-    // do something with error
+
+import (
+	"context"
+	"database/sql"
+	"log"
+
+	_ "github.com/jackc/pgx/v4/stdlib"
+)
+
+func IsItAliveQuestionMark() {
+	db, err := sql.Open("pgx", "postgres://pgx_md5:secret@localhost:5432/pgx_test")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	if err := db.PingContext(context.Background()); err != nil {
+		log.Fatal(err)
+	}
 }

lectures/07-sql/conn/conn.go

@@ -1,7 +1,17 @@
+package query
+
+import (
+	"context"
+	"database/sql"
+	"log"
+)
+
+func Conn(ctx context.Context, db *sql.DB) {
 	c, err := db.Conn(ctx)
 	if err != nil {
 		log.Fatal(err)
 	}
+	defer c.Close()
 
-_ := c.PingContext(ctx)
+	_ = c.PingContext(ctx)
-_, _ := c.QueryContext(...)
+}

lectures/07-sql/exec/exec.go

@@ -1,9 +1,19 @@
+package exec
+
+import (
+	"context"
+	"database/sql"
+	"log"
+)
+
+func Exec(ctx context.Context, db *sql.DB) {
 	res, err := db.ExecContext(ctx, "UPDATE users SET name = $1 WHERE id = $2", "William Mandella", 1)
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	lastID, _ := res.LastInsertId()
-rowsAffeced, := res.RowsAffected()
+	rowsAffected, _ := res.RowsAffected()
 
 	log.Println(lastID, rowsAffected)
+}

lectures/07-sql/exec/result.go

@@ -1,3 +1,5 @@
+package exec
+
 type Result interface {
 	LastInsertId() (int64, error)
 	RowsAffected() (int64, error)

lectures/07-sql/named/insert.go

@@ -1,5 +1,18 @@
-db.ExecContext(
+package named
-    ctx,
+
-    "INSERT INTO users(name) VALUES(@name)"),
+import (
-    sql.Named("name", "Rocinante"),
+	"context"
+	"database/sql"
+	"log"
 )
+
+func Insert(ctx context.Context, db *sql.DB) {
+	_, err := db.ExecContext(
+		ctx,
+		"INSERT INTO users(name) VALUES(@name)",
+		sql.Named("name", "Amos Burton"),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+}

lectures/07-sql/named/named.go

@@ -1,3 +1,5 @@
+package named
+
 type NamedArg struct {
 	Name  string
 	Value interface{}

lectures/07-sql/nulls/insert.go

@@ -0,0 +1,28 @@
+package nulls
+
+import (
+	"context"
+	"database/sql"
+	"log"
+)
+
+func Insert(ctx context.Context, db *sql.DB, name interface{}) {
+	_, err := db.ExecContext(
+		ctx,
+		"INSERT INTO users(name) VALUES(@name)",
+		sql.Named("name", name),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func DoStuff(ctx context.Context, db *sql.DB) {
+	// Nulls
+	Insert(ctx, db, nil)
+	Insert(ctx, db, sql.NullString{})
+
+	// Values
+	Insert(ctx, db, "The Shrike")
+	Insert(ctx, db, sql.NullString{String: "The Shrike", Valid: true})
+}

lectures/07-sql/nulls/insert_null.go

@@ -1,6 +0,0 @@
-var name sql.NullString
-db.ExecContext(
-    ctx,
-    "INSERT INTO users(name) VALUES(@name)"),
-    sql.Named("name", name),
-)

lectures/07-sql/nulls/insert_value.go

@@ -1,6 +0,0 @@
-name := sql.NullString{Value: "The Shrike",Valid: true}
-db.ExecContext(
-    ctx,
-    "INSERT INTO users(name) VALUES(@name)"),
-    sql.Named("name", name),
-)

lectures/07-sql/nulls/nulls.go

@@ -1,3 +1,5 @@
+package nulls
+
 type NullString struct {
 	String string
 	Valid  bool

lectures/07-sql/nulls/rows.go

@@ -1,3 +1,18 @@
+package nulls
+
+import (
+	"context"
+	"database/sql"
+	"log"
+)
+
+func Results(ctx context.Context, db *sql.DB) {
+	rows, err := db.QueryContext(ctx, "SELECT id, name FROM users WHERE id = $1", 1)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer rows.Close()
+
 	for rows.Next() {
 		var s sql.NullString
 		if err := rows.Scan(&s); err != nil {
@@ -10,3 +25,4 @@ for rows.Next() {
 			//
 		}
 	}
+}

lectures/07-sql/open/pgx.go

@@ -1,7 +1,17 @@
+package open
+
 import (
 	"context"
+	"log"
 
 	"github.com/jackc/pgx/v4"
 )
 
-conn, err := pgx.Connect(context.Background(), "postgres://pgx_md5:secret@localhost:5432/pgx_test")
+func PGXOpen() {
+	ctx := context.Background()
+	conn, err := pgx.Connect(ctx, "postgres://pgx_md5:secret@localhost:5432/pgx_test")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer conn.Close(ctx)
+}

lectures/07-sql/open/sql.go

@@ -1,11 +1,16 @@
+package open
+
 import (
 	"database/sql"
+	"log"
 
 	_ "github.com/jackc/pgx/v4/stdlib"
 )
 
+func SQLOpen() {
 	db, err := sql.Open("pgx", "postgres://pgx_md5:secret@localhost:5432/pgx_test")
 	if err != nil {
-    return err
+		log.Fatal(err)
 	}
 	defer db.Close()
+}

lectures/07-sql/prepare/prepare.go

@@ -1,3 +1,12 @@
+package prepare
+
+import (
+	"context"
+	"database/sql"
+	"log"
+)
+
+func Prepare(ctx context.Context, db *sql.DB) {
 	stmt, err := db.PrepareContext(ctx, "SELECT name FROM users WHERE id = $1")
 	if err != nil {
 		log.Fatal(err)
@@ -5,15 +14,11 @@ if err != nil {
 	defer stmt.Close()
 
 	for i := 1; ; i++ {
-    row, err := stmt.QueryRowContext(ctx, i)
-    if err != nil {
-        log.Fatal(err)
-    }
-
 		var name string
-    if err = row.Scan(&name); err != nil {
+		if err = stmt.QueryRowContext(ctx, i).Scan(&name); err != nil {
 			log.Fatal(err)
 		}
 
 		log.Println(name)
 	}
+}

lectures/07-sql/query/query.go

@@ -1,3 +1,12 @@
+package query
+
+import (
+	"context"
+	"database/sql"
+	"log"
+)
+
+func Query(ctx context.Context, db *sql.DB) {
 	rows, err := db.QueryContext(ctx, "SELECT id, name FROM users WHERE id = $1", 1)
 	if err != nil {
 		log.Fatal(err)
@@ -17,3 +26,4 @@ for rows.Next() {
 	if err = rows.Err(); err != nil {
 		log.Fatal(err)
 	}
+}

lectures/07-sql/query/queryrow.go

@@ -1,6 +1,16 @@
+package query
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"log"
+)
+
+func QueryRow(ctx context.Context, db *sql.DB) {
 	var id int
 	var name string
-err = db.QueryRowContext(ctx, "SELECT id, name FROM users WHERE id = $1", 1).Scan(&id, &name);
+	err := db.QueryRowContext(ctx, "SELECT id, name FROM users WHERE id = $1", 1).Scan(&id, &name)
 	if err != nil {
 		if errors.Is(err, sql.ErrNoRows) {
 			log.Println("nothing found")
@@ -11,3 +21,4 @@ if err != nil {
 	}
 
 	log.Println(name)
+}

lectures/07-sql/sql.slide

@@ -20,10 +20,10 @@ database/sql
 * Подключение
 
 - через database/sql
-.code open/sql.go
+.code open/sql.go /^func SQLOpen/,/^}/
 
 - драйвером на прямую
-.code open/pgx.go
+.code open/pgx.go /^func PGXOpen/,/^}/
 
 * Основные сущности
 
@@ -37,45 +37,45 @@ database/sql
 
 * Проверка доступности
 
-.code alive/ping.go
+.code alive/ping.go /^func IsItAliveQuestionMark/,/^}/
 
 * Запрос с получением результатов
 
-.code query/query.go
+.code query/query.go /^func Query/,/^}/
 
 * Запрос с получением одного результата
 
-.code query/queryrow.go
+.code query/queryrow.go /^func QueryRow/,/^}/
 
 * Запрос без результатов
 
-.code exec/exec.go
+.code exec/exec.go /^func Exec/,/^}/
 
 Возвращаемый тип
-.code exec/result.go
+.code exec/result.go /^type Result/,/^}/
-
-* Nulls
-
-.code nulls/nulls.go
-
-* Null в аргументах
-
-Передаём null
-.code nulls/insert_null.go
-Передаём значение
-.code nulls/insert_value.go
-
-* Null в результатах
-.code nulls/rows.go
 
 * Именованые аргументы
 - реализуются на уровне драйвера
 
-.code named/named.go
+.code named/named.go /^type NamedArg/,/^}/
-
 
 * Именованые аргументы - использование
-.code named/insert.go
+
+.code named/insert.go /^func Insert/,/^}/
+
+* Nulls
+
+.code nulls/nulls.go /^type NullString/,/^}/
+
+* Null в аргументах
+
+.code nulls/insert.go /^func Insert/,/^}/
+
+Передаём значения
+.code nulls/insert.go /^func DoStuff/,/^}/
+
+* Null в результатах
+.code nulls/rows.go /^func Results/,/^}/
 
 * Prepared Statements
 
@@ -89,15 +89,15 @@ database/sql
 
 * Prepare
 
-.code prepare/prepare.go
+.code prepare/prepare.go /^func Prepare/,/^}/
 
 * Одно подключение
 
-.code conn/conn.go
+.code conn/conn.go /^func Conn/,/^}/
 
 * Транзакции
 
-.code tx/tx.go
+.code tx/tx.go /^func Begin/,/^}/
 
 * Типовые ошибки и подводные камни
 
@@ -129,15 +129,36 @@ database/sql
 
 * sqlx - обобщенный интерфейс
 
-.code sqlx/ext.go
+.code sqlx/ext.go /^type QueryerContext/,/^}/
+.code sqlx/ext.go /^type ExecerContext/,/^}/
+.code sqlx/ext.go /^type ExtContext/,/^}/
 
 * sqlx - StructScan
 
-.code sqlx/structscan.go
+  func (r *Rows) StructScan(dest interface{}) error
+
+  func (r *Row) StructScan(dest interface{}) error
+
+  func StructScan(rows rowsi, dest interface{}) error
+
+  type rowsi interface {
+      Close() error
+      Columns() ([]string, error)
+      Err() error
+      Next() bool
+      Scan(...interface{}) error
+  }
 
 * sqlx - StructScan на практике
 
-.code sqlx/example.go
+.code sqlx/structscan.go /^func Example/,/^}/
+
+* sqlx - именованые аргументы
+
+- работают для любого драйвера
+- тоже защищают от SQL-injection
+
+.code sqlx/named.go /^func Insert/,/^}/
 
 * GORM
 

lectures/07-sql/sql/driver.go

@@ -1,7 +1,14 @@
+package sql
+
+import (
+	"context"
+	"database/sql/driver"
+)
+
 type Driver interface {
-    Open(name string) (Conn, error)
+	Open(name string) (driver.Conn, error)
 }
 
 type QueryerContext interface {
-    QueryContext(ctx context.Context, query string, args []NamedValue) (Rows, error)
+	QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error)
 }

lectures/07-sql/sqlx/example.go

@@ -1,21 +0,0 @@
-rows, err := db.QueryContext(ctx, "SELECT id, name FROM users WHERE id = $1", 1)
-if err != nil {
-    log.Fatal(err)
-}
-defer rows.Close()
-
-for rows.Next() {
-    var value struct {
-        ID int          `db:"id"`
-        Name string     `db:"name"`
-    }
-    if err := rows.StructScan(&value); err != nil {
-        log.Fatal(err)
-    }
-
-    log.Println(value)
-}
-
-if err = rows.Err(); err != nil {
-    log.Fatal(err)
-}

lectures/07-sql/sqlx/ext.go

@@ -1,7 +1,16 @@
+package sqlx
+
+import (
+    "context"
+    "database/sql"
+
+    "github.com/jmoiron/sqlx"
+)
+
 type QueryerContext interface {
     QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
-    QueryxContext(ctx context.Context, query string, args ...interface{}) (*Rows, error)
+    QueryxContext(ctx context.Context, query string, args ...interface{}) (*sqlx.Rows, error)
-    QueryRowxContext(ctx context.Context, query string, args ...interface{}) *Row
+    QueryRowxContext(ctx context.Context, query string, args ...interface{}) *sqlx.Row
 }
 
 type ExecerContext interface {

lectures/07-sql/sqlx/named.go

@@ -0,0 +1,21 @@
+package sqlx
+
+import (
+	"context"
+	"log"
+
+	"github.com/jmoiron/sqlx"
+)
+
+func Insert(ctx context.Context, db *sqlx.DB) {
+	_, err := db.NamedExecContext(
+		ctx,
+		"INSERT INTO users(name) VALUES(:name)",
+		map[string]interface{}{
+			"name": "Jukka Sarasti",
+		},
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+}

lectures/07-sql/sqlx/open.go

@@ -1,10 +1,16 @@
+package sqlx
+
 import (
-    "github.com/jmoiron/sqlx"
+	"log"
+
 	_ "github.com/jackc/pgx/v4/stdlib"
+	"github.com/jmoiron/sqlx"
 )
 
+func Open() {
 	db, err := sqlx.Open("pgx", "postgres://pgx_md5:secret@localhost:5432/pgx_test")
 	if err != nil {
-    return err
+		log.Fatal(err)
 	}
 	defer db.Close()
+}

lectures/07-sql/sqlx/structscan.go

@@ -1,5 +1,32 @@
-func StructScan(rows rowsi, dest interface{}) error
+package sqlx
 
-func (r *Rows) StructScan(dest interface{}) error
+import (
+	"context"
+	"log"
 
-func (r *Row) StructScan(dest interface{}) error
+	"github.com/jmoiron/sqlx"
+)
+
+func Example(ctx context.Context, db *sqlx.DB) {
+	rows, err := db.QueryContext(ctx, "SELECT id, name FROM users WHERE id = $1", 1)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var value struct {
+			ID   int    `db:"id"`
+			Name string `db:"name"`
+		}
+		if err := sqlx.StructScan(rows, &value); err != nil {
+			log.Fatal(err)
+		}
+
+		log.Println(value)
+	}
+
+	if err = rows.Err(); err != nil {
+		log.Fatal(err)
+	}
+}

lectures/07-sql/tx/tx.go

@@ -1,13 +1,23 @@
+package tx
+
+import (
+	"context"
+	"database/sql"
+	"log"
+)
+
+func Begin(ctx context.Context, db *sql.DB) {
 	tx, err := db.BeginTx(ctx, nil)
 	if err != nil {
 		log.Fatal(err)
 	}
 	defer tx.Rollback()
 
-if _, err = tx.ExecContext(ctx, ...); err != nil {
+	if _, err = tx.ExecContext(ctx, `UPDATE users SET name = "Tyador Borlú" WHERE id = 1`); err != nil {
 		log.Fatal(err)
 	}
 
 	if err = tx.Commit(); err != nil {
 		log.Fatal(err)
 	}
+}