JDBC类型与JAVA类型对应关系
最近在做代码生成工具，通过数据库表生成代码半成品，其中就有JDBC类型与JAVA类型对应的问题。
我的做法看看别人是怎么对应的，JDBC驱动里面一定有，我们就postgresql数据，通过搜索解压后的源代码文件试试看。
翻了几个文件，在TypeInfocache.java里有type[][]二维数据定义
private static final Object types[][] = {
{"int2", new Integer(Oid.INT2), new Integer(Types.SMALLINT), "java.lang.Integer", new Integer(Oid.INT2_ARRAY)},
{"int4", new Integer(Oid.INT4), new Integer(Types.INTEGER), "java.lang.Integer", new Integer(Oid.INT4_ARRAY)},
{"oid", new Integer(Oid.OID), new Integer(Types.BIGINT), "java.lang.Long", new Integer(Oid.OID_ARRAY)},
{"int8", new Integer(Oid.INT8), new Integer(Types.BIGINT), "java.lang.Long", new Integer(Oid.INT8_ARRAY)},
{"money", new Integer(Oid.MONEY), new Integer(Types.DOUBLE), "java.lang.Double", new Integer(Oid.MONEY_ARRAY)},
{"numeric", new Integer(Oid.NUMERIC), new Integer(Types.NUMERIC), "java.math.BigDecimal", new Integer(Oid.NUMERIC_ARRAY)},
{"float4", new Integer(Oid.FLOAT4), new Integer(Types.REAL), "java.lang.Float", new Integer(Oid.FLOAT4_ARRAY)},
{"float8", new Integer(Oid.FLOAT8), new Integer(Types.DOUBLE), "java.lang.Double", new Integer(Oid.FLOAT8_ARRAY)},
{"char", new Integer(Oid.CHAR), new Integer(Types.CHAR), "java.lang.String", new Integer(Oid.CHAR_ARRAY)},
{"bpchar", new Integer(Oid.BPCHAR), new Integer(Types.CHAR), "java.lang.String", new Integer(Oid.BPCHAR_ARRAY)},
{"varchar", new Integer(Oid.VARCHAR), new Integer(Types.VARCHAR), "java.lang.String", new Integer(Oid.VARCHAR_ARRAY)},
{"text", new Integer(Oid.TEXT), new Integer(Types.VARCHAR), "java.lang.String", new Integer(Oid.TEXT_ARRAY)},
{"name", new Integer(Oid.NAME), new Integer(Types.VARCHAR), "java.lang.String", new Integer(Oid.NAME_ARRAY)},
{"bytea", new Integer(Oid.BYTEA), new Integer(Types.BINARY), "[B", new Integer(Oid.BYTEA_ARRAY)},
{"bool", new Integer(Oid.BOOL), new Integer(Types.BIT), "java.lang.Boolean", new Integer(Oid.BOOL_ARRAY)},
{"bit", new Integer(Oid.BIT), new Integer(Types.BIT), "java.lang.Boolean", new Integer(Oid.BIT_ARRAY)},
{"date", new Integer(Oid.DATE), new Integer(Types.DATE), "java.sql.Date", new Integer(Oid.DATE_ARRAY)},
{"time", new Integer(Oid.TIME), new Integer(Types.TIME), "java.sql.Time", new Integer(Oid.TIME_ARRAY)},
{"timetz", new Integer(Oid.TIMETZ), new Integer(Types.TIME), "java.sql.Time", new Integer(Oid.TIMETZ_ARRAY)},
{"timestamp", new Integer(Oid.TIMESTAMP), new Integer(Types.TIMESTAMP), "java.sql.Timestamp", new Integer(Oid.TIMESTAMP_ARRAY)},
{"timestamptz", new Integer(Oid.TIMESTAMPTZ), new Integer(Types.TIMESTAMP), "java.sql.Timestamp", new Integer(Oid.TIMESTAMPTZ_ARRAY)},
};
这里提供的对应关系可以做为参考。或者搜索一下mybatis-generator源代码，看看是怎么对应的。