[buggins]

Closes #187

• source/ddbc/package.d: dependency snippet ~>0.13.0; README (Choosing drivers): ~>0.13. ddbc keeps its version in tags only.

After merging, tag v0.13.0. Draft release notes below.

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A new configuration, full-native, puts all the newer drivers into one build (#185, #186), and the native drivers move to the current releases of their connectors, which all build on dbwire 0.9 (#178–#181).

full-native: all new drivers together

Until now each native driver had its own configuration, and a build has exactly one, so an application couldn't use native PostgreSQL and native SQL Server together, or a native driver together with MySQL or SQLite. full-native has them all:

"subConfigurations": { "ddbc": "full-native" }

Driver	Library
MySQL	mysql-native
SQLite	sqlite3 (as in full)
ClickHouse	clickhoused
SQL Server	mssql-native
Oracle	oracle-native
PostgreSQL	postgresql-native

There's no libpq or ODBC in it, so postgresql://, sqlserver:// and oracle:// URLs use the native drivers. full stays the default. A test-native configuration runs all of these drivers' tests in one binary, in CI too.

Choosing drivers

The README has a new "Choosing drivers" section (#182, #183): all configurations with their drivers, version identifiers and C libraries, which URL scheme selects which driver, and how thread or vibe.d (fiber) mode is chosen.

Connectors

Configuration	Connector	Was
ClickHouse	clickhoused 0.9.2	0.9.0
PGNATIVE	postgresql-native 0.6.1	0.5
ORACLE	oracle-native 0.4.1	0.3.1
MSSQL	mssql-native 0.3.1	0.2.4

ddbc itself depends on dbwire:types 0.9.6 (was 0.8). The connector releases come from a code review of each of them: robustness against malformed server data, thread safety, fixes for connections left in a wrong state after errors, and faster row decoding and float text.

What changes for ddbc users

• SQL Server (MSSQL): getString of float/real columns is plain up to 15 digits before the point (6 for real), as SQL Server writes it: 100, not 1e+02; 1e+15 and 1.5e-05 keep the exponent form.
• connect_timeout=0 now means no time limit in all four native drivers (PostgreSQL: as in libpq; it used to mean 15 seconds there, and failed at once in the others).
• PostgreSQL (PGNATIVE), TLS: as in libpq, sslmode=verify-ca needs a CA file (sslrootcert or ~/.postgresql/root.crt) instead of falling back to the system's CAs, and the default client key ~/.postgresql/postgresql.key must not be readable by group or others.
• Oracle (ORACLE), TLS: ssl_server_dn_match=off without ssl_server_cert_dn needs a wallet or tls_ca_file. Float text no longer depends on the C locale (1,5e-07 after setlocale(LC_NUMERIC, "de_DE.UTF-8")).
• Passwords in connection strings (?password=, sslpassword=, wallet_password=) are masked in error messages.

Compatibility

• ddbc's own API is unchanged, and the existing configurations are too. The minimum D frontend is still 2.097 (DMD 2.097, LDC 1.27).
• Code that uses the connectors directly (getNativeConnection, or its own imports) meets their API changes; see the CHANGELOG files of clickhoused (0.9.1), postgresql-native (0.6.0), oracle-native (0.4.0) and mssql-native (0.3.0).
• Projects that pin other versions of these connectors or of dbwire must update them together.

Full changelog: v0.12.0...v0.13.0

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